DAMASK_EICMD/processing/misc/yieldSurface.py

1390 lines
57 KiB
Python
Executable File

#!/usr/bin/python
# -*- coding: UTF-8 no BOM -*-
import threading,time,os,subprocess,shlex,string
import numpy as np
from scipy.linalg import svd
from optparse import OptionParser
import damask
from damask.util import leastsqBound
scriptID = string.replace('$Id$','\n','\\n')
scriptName = scriptID.split()[1][:-3]
def execute(cmd,streamIn=None,wd='./'):
'''
executes a command in given directory and returns stdout and stderr for optional stdin
'''
initialPath=os.getcwd()
os.chdir(wd)
process = subprocess.Popen(shlex.split(cmd),stdout=subprocess.PIPE,stderr = subprocess.PIPE,stdin=subprocess.PIPE)
if streamIn != None:
out,error = process.communicate(streamIn.read())
else:
out,error = process.communicate()
os.chdir(initialPath)
return out,error
def principalStresses(sigmas):
'''
computes principal stresses (i.e. eigenvalues) for a set of Cauchy stresses.
sorted in descending order.
'''
lambdas=np.zeros(0,'d')
for i in xrange(np.shape(sigmas)[1]):
eigenvalues = np.linalg.eigvalsh(sym6to33(sigmas[:,i]))
lambdas = np.append(lambdas,np.sort(eigenvalues)[::-1]) #append eigenvalues in descending order
lambdas = np.transpose(lambdas.reshape(np.shape(sigmas)[1],3))
return lambdas
def principalStress(p):
sin = np.sin; cos = np.cos
I1,I2,I3 = invariant(p)
I1s3I2= (I1**2 - 3.0*I2)**0.5
numer = 2.0*I1**3 - 9.0*I1*I2 + 27.0*I3
denom = 0.5*I1s3I2**(-3.0)
cs = numer*denom
phi = np.arccos(cs)/3.0
t1 = I1/3.0; t2 = 2.0/3.0*I1s3I2
return np.array( [t1 + t2*cos(phi), t1+t2*cos(phi+np.pi*2.0/3.0), t1+t2*cos(phi+np.pi*4.0/3.0)])
def principalStrs_Der(p, (s1, s2, s3, s4, s5, s6), dim, Karafillis=False):
'''
The derivative of principal stress with respect to stress
'''
sin = np.sin; cos = np.cos
I1,I2,I3 = invariant(p)
third = 1.0/3.0
I1s3I2= (I1**2 - 3.0*I2)**0.5
numer = 2.0*I1**3 - 9.0*I1*I2 + 27.0*I3
denom = 0.5*I1s3I2**(-3.0)
cs = numer*denom
phi = np.arccos(cs)*third
dphidcs = -third/np.sqrt(1.0 - cs**2)
dcsddenom = 0.5*numer*(-1.5)*I1s3I2**(-5.0)
dcsdI1 = (6.0*I1**2 - 9.0*I2)*denom + dcsddenom*(2.0*I1)
dcsdI2 = ( - 9.0*I1)*denom + dcsddenom*(-3.0)
dcsdI3 = 27.0*denom
dphidI1, dphidI2, dphidI3 = dphidcs*dcsdI1, dphidcs*dcsdI2, dphidcs*dcsdI3
dI1s3I2dI1= I1/I1s3I2; dI1s3I2dI2 = -1.5/I1s3I2
third2 = 2.0*third; tcoeff = third2*I1s3I2
dSidIj = lambda theta : ( tcoeff*(-sin(theta))*dphidI1 + third2*dI1s3I2dI1*cos(theta) + third,
tcoeff*(-sin(theta))*dphidI2 + third2*dI1s3I2dI2*cos(theta),
tcoeff*(-sin(theta))*dphidI3)
dSdI = np.array([dSidIj(phi),dSidIj(phi+np.pi*2.0/3.0),dSidIj(phi+np.pi*4.0/3.0)]) # i=1,2,3; j=1,2,3
# calculate the derivation of principal stress with regards to the anisotropic coefficients
one = np.ones_like(s1); zero = np.zeros_like(s1); num = len(s1)
dIdp = np.array([[one, one, one, zero, zero, zero],
[p[1]+p[2], p[2]+p[0], p[0]+p[1], -2.0*p[3], -2.0*p[4], -2.0*p[5]],
[p[1]*p[2]-p[4]**2, p[2]*p[0]-p[5]**2, p[0]*p[1]-p[3]**2,
-2.0*p[3]*p[2]+2.0*p[4]*p[5], -2.0*p[4]*p[0]+2.0*p[5]*p[3], -2.0*p[5]*p[1]+2.0*p[3]*p[4]] ])
if Karafillis:
dpdc = np.array([[zero,s2-s3,s3-s2], [s1-s3,zero,s3-s1], [s1-s2,s2-s1,zero]])
dSdp = np.array([np.dot(dSdI[:,:,i],dIdp[:,:,i]).T for i in xrange(num)]).T
if dim == 2: temp = np.vstack([dSdp[:,3]*s4]).T.reshape(num,1,3).T
else: temp = np.vstack([dSdp[:,3]*s4,dSdp[:,4]*s5,dSdp[:,5]*s6]).T.reshape(num,3,3).T
return np.concatenate((np.array([np.dot(dSdp[:,0:3,i], dpdc[:,:,i].T).T/3.0 for i in xrange(num)]).T,
temp), axis=1)
else:
if dim == 2:
dIdc=np.array([[-dIdp[i,0]*s2, -dIdp[i,1]*s1, -dIdp[i,1]*s3,
-dIdp[i,2]*s2, -dIdp[i,2]*s1, -dIdp[i,0]*s3,
dIdp[i,3]*s4 ] for i in xrange(3)])
else:
dIdc=np.array([[-dIdp[i,0]*s2, -dIdp[i,1]*s1, -dIdp[i,1]*s3,
-dIdp[i,2]*s2, -dIdp[i,2]*s1, -dIdp[i,0]*s3,
dIdp[i,3]*s4, dIdp[i,4]*s5, dIdp[i,5]*s6 ] for i in xrange(3)])
return np.array([np.dot(dSdI[:,:,i],dIdc[:,:,i]).T for i in xrange(num)]).T
def invariant(sigmas):
s11,s22,s33,s12,s23,s31 = sigmas
I1 = s11 + s22 + s33
I2 = s11*s22 + s22*s33 + s33*s11 - s12**2 - s23**2 - s31**2
I3 = s11*s22*s33 + 2.0*s12*s23*s31 - s12**2*s33 - s23**2*s11 - s31**2*s22
return (I1,I2,I3)
def formatOutput(n, type='%-14.6f'):
return ''.join([type for i in xrange(n)])
def math_ln(x):
return np.log(x + 1.0e-32)
def sym6to33(sigma6):
''' Shape the symmetric stress tensor(6,1) into (3,3) '''
sigma33 = np.empty((3,3))
sigma33[0,0] = sigma6[0]; sigma33[1,1] = sigma6[1]; sigma33[2,2] = sigma6[2];
sigma33[0,1] = sigma6[3]; sigma33[1,0] = sigma6[3]
sigma33[1,2] = sigma6[4]; sigma33[2,1] = sigma6[4]
sigma33[2,0] = sigma6[5]; sigma33[0,2] = sigma6[5]
return sigma33
def array2tuple(array):
'''transform numpy.array into tuple'''
try:
return tuple(array2tuple(i) for i in array)
except TypeError:
return array
def get_weight(ndim):
#more to do
return np.ones(ndim)
class Criteria(object):
'''
residuum of anisotropic Barlat 1991 yield criterion (eq. 2.37)
'''
def __init__(self, criterion, uniaxialStress,exponent, dimension):
self.stress0 = uniaxialStress
if exponent < 0.0: # The exponent m is undetermined
self.mFix = [False, exponent]
else: # The exponent m is fixed
self.mFix = [True, exponent]
self.func = fitCriteria[criterion]['func']
self.criteria = criterion
self.dim = dimension
def fun(self, paras, ydata, sigmas):
return self.func(self.stress0, paras, sigmas,self.mFix,self.criteria,self.dim)
def jac(self, paras, ydata, sigmas):
return self.func(self.stress0, paras, sigmas,self.mFix,self.criteria,self.dim,Jac=True)
class Vegter(object):
'''
Vegter yield criterion
'''
def __init__(self, refPts, refNormals,nspace=11):
self.refPts, self.refNormals = self._getRefPointsNormals(refPts, refNormals)
self.hingePts = self._getHingePoints()
self.nspace = nspace
def _getRefPointsNormals(self,refPtsQtr,refNormalsQtr):
if len(refPtsQtr) == 12:
refPts = refPtsQtr
refNormals = refNormalsQtr
else:
refPts = np.empty([13,2])
refNormals = np.empty([13,2])
refPts[12] = refPtsQtr[0]
refNormals[12] = refNormalsQtr[0]
for i in xrange(3):
refPts[i] = refPtsQtr[i]
refPts[i+3] = refPtsQtr[3-i][::-1]
refPts[i+6] =-refPtsQtr[i]
refPts[i+9] =-refPtsQtr[3-i][::-1]
refNormals[i] = refNormalsQtr[i]
refNormals[i+3] = refNormalsQtr[3-i][::-1]
refNormals[i+6] =-refNormalsQtr[i]
refNormals[i+9] =-refNormalsQtr[3-i][::-1]
return refPts,refNormals
def _getHingePoints(self):
'''
calculate the hinge point B according to the reference points A,C and the normals n,m
refPoints = np.array([[p1_x, p1_y], [p2_x, p2_y]]);
refNormals = np.array([[n1_x, n1_y], [n2_x, n2_y]])
'''
def hingPoint(points, normals):
A1 = points[0][0]; A2 = points[0][1]
C1 = points[1][0]; C2 = points[1][1]
n1 = normals[0][0]; n2 = normals[0][1]
m1 = normals[1][0]; m2 = normals[1][1]
B1 = (m2*(n1*A1 + n2*A2) - n2*(m1*C1 + m2*C2))/(n1*m2-m1*n2)
B2 = (n1*(m1*C1 + m2*C2) - m1*(n1*A1 + n2*A2))/(n1*m2-m1*n2)
return np.array([B1,B2])
return np.array([hingPoint(self.refPts[i:i+2],self.refNormals[i:i+2]) for i in xrange(len(self.refPts)-1)])
def getBezier(self):
def bezier(R,H):
b = []
for mu in np.linspace(0.0,1.0,self.nspace):
b.append(np.array(R[0]*np.ones_like(mu) + 2.0*mu*(H - R[0]) + mu**2*(R[0]+R[1] - 2.0*H)))
return b
return np.array([bezier(self.refPts[i:i+2],self.hingePts[i]) for i in xrange(len(self.refPts)-1)])
def VetgerCriterion(stress,lankford, rhoBi0, theta=0.0):
'''
0-pure shear; 1-uniaxial; 2-plane strain; 3-equi-biaxial
'''
def getFourierParas(r):
# get the value after Fourier transformation
nset = len(r)
lmatrix = np.empty([nset,nset])
theta = np.linspace(0.0,np.pi/2,nset)
for i,th in enumerate(theta):
lmatrix[i] = np.array([np.cos(2*j*th) for j in xrange(nset)])
return np.linalg.solve(lmatrix, r)
nps = len(stress)
if nps%4 != 0:
print ('Warning: the number of stress points is uncorrect, stress points of %s are missing in set %i'%(
['eq-biaxial, plane strain & uniaxial', 'eq-biaxial & plane strain','eq-biaxial'][nps%4-1],nps/4+1))
else:
nset = nps/4
strsSet = stress.reshape(nset,4,2)
refPts = np.empty([4,2])
fouriercoeffs = np.array([np.cos(2.0*i*theta) for i in xrange(nset)])
for i in xrange(2):
refPts[3,i] = sum(strsSet[:,3,i])/nset
for j in xrange(3):
refPts[j,i] = np.dot(getFourierParas(strsSet[:,j,i]), fouriercoeffs)
rhoUn = np.dot(getFourierParas(-lankford/(lankford+1)), fouriercoeffs)
rhoBi = (rhoBi0+1 + (rhoBi0-1)*np.cos(2.0*theta))/(rhoBi0+1 - (rhoBi0-1)*np.cos(2.0*theta))
nVec = lambda rho : np.array([1.0,rho]/np.sqrt(1.0+rho**2))
refNormals = np.array([nVec(-1.0),nVec(rhoUn),nVec(0.0),nVec(rhoBi)])
vegter = Vegter(refPts, refNormals)
def Tresca(eqStress, paras, sigmas, mFix, criteria, dim, Jac = False):
'''
Tresca yield criterion
the fitted parameters is: paras(sigma0)
eqStress, mFix, criteria, dim are invalid input
'''
if not Jac:
lambdas = principalStresses(sigmas)
r = np.amax(np.array([abs(lambdas[2,:]-lambdas[1,:]),\
abs(lambdas[1,:]-lambdas[0,:]),\
abs(lambdas[0,:]-lambdas[2,:])]),0) - paras
return r.ravel()
else:
return -np.ones(len(sigmas))
def Cazacu_Barlat(eqStress, paras, sigmas, mFix, criteria, dim, Jac = False):
'''
Cazacu-Barlat (CB) yield criterion
the fitted parameters are:
a1,a2,a3,a6; b1,b2,b3,b4,b5,b10; c for plane stress
a1,a2,a3,a4,a5,a6; b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11; c: for general case
mFix are invalid input
'''
s11,s22,s33,s12,s23,s31 = sigmas
if dim == 2:
(a1,a2,a3,a4), (b1,b2,b3,b4,b5,b10), c = paras[0:4],paras[4:10],paras[10]
a5 = a6 = b6 = b7 = b8 = b9 = b11 = 0.0
s33 = s23 = s31 = np.zeros_like(s11)
else:
(a1,a2,a3,a4,a5,a6), (b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11), c = paras[0:6],paras[6:17],paras[17]
s1_2, s2_2, s3_2, s12_2, s23_2, s31_2 = np.array([s11,s22,s33,s12,s23,s31])**2
s1_3, s2_3, s3_3, s123, s321 = s11*s1_2, s22*s2_2, s33*s3_2,s11*s22*s33, s12*s23*s31
d12_2,d23_2,d31_2 = (s11-s22)**2, (s22-s33)**2, (s33-s11)**2
J20 = ( a1*d12_2 + a2*d23_2 + a3*d31_2 )/6.0 + a4*s12_2 + a5*s23_2 + a6*s31_2
J30 = ( (b1 +b2 )*s1_3 + (b3 +b4 )*s2_3 + ( b1+b4-b2 + b1+b4-b3 )*s3_3 )/27.0- \
( (b1*s22+b2*s33)*s1_2 + (b3*s33+b4*s11)*s2_2 + ((b1+b4-b2)*s11 + (b1+b4-b3)*s22)*s3_2 )/9.0 + \
( (b1+b4)*s123/9.0 + b11*s321 )*2.0 - \
( ( 2.0*b9 *s22 - b8*s33 - (2.0*b9 -b8)*s11 )*s31_2 +
( 2.0*b10*s33 - b5*s22 - (2.0*b10-b5)*s11 )*s12_2 +
( (b6+b7)*s11 - b6*s22 - b7*s33 )*s23_2
)/3.0
f0 = J20**3 - c*J30**2
r = f0**(1.0/6.0)*np.sqrt(3.0)/eqStress
if not Jac:
return (r - 1.0).ravel()
else:
drdf = r/f0/6.0
dj2, dj3 = drdf*3.0*J20**2, -drdf*2.0*J30*c
jc = -drdf*J30**2
ja1,ja2,ja3 = dj2*d12_2/6.0, dj2*d23_2/6.0, dj2*d31_2/6.0
ja4,ja5,ja6 = dj2*s12_2, dj2*s23_2, dj2*s31_2
jb1 = dj3*( (s1_3 + 2.0*s3_3)/27.0 - s22*s1_2/9.0 - (s11+s22)*s3_2/9.0 + s123/4.5 )
jb2 = dj3*( (s1_3 - s3_3)/27.0 - s33*s1_2/9.0 + s11 *s3_2/9.0 )
jb3 = dj3*( (s2_3 - s3_3)/27.0 - s33*s2_2/9.0 + s22 *s3_2/9.0 )
jb4 = dj3*( (s2_3 + 2.0*s3_3)/27.0 - s11*s2_2/9.0 - (s11+s22)*s3_2/9.0 + s123/4.5 )
jb5, jb10 = dj3*(s22 - s11)*s12_2/3.0, dj3*(s11 - s33)*s12_2/1.5
jb6, jb7 = dj3*(s22 - s11)*s23_2/3.0, dj3*(s33 - s11)*s23_2/3.0
jb8, jb9 = dj3*(s33 - s11)*s31_2/3.0, dj3*(s11 - s22)*s31_2/1.5
jb11 = dj3*s321*2.0
if dim == 2:
return np.vstack((ja1,ja2,ja3,ja4,jb1,jb2,jb3,jb4,jb5,jb10,jc)).T
else:
return np.vstack((ja1,ja2,ja3,ja4,ja5,ja6,jb1,jb2,jb3,jb4,jb5,jb6,jb7,jb8,jb9,jb10,jb11,jc)).T
def Drucker(eqStress, paras, sigmas, mFix, criteria, dim, Jac = False):
'''
Drucker yield criterion
the fitted parameters are
sigma0, C_D for Drucker(p=1);
sigma0, C_D, p for general Drucker
eqStress, mFix are invalid inputs
'''
if criteria == 'drucker':
sigma0, C_D= paras
p = 1.0
else:
sigma0, C_D = paras[0:2]
if mFix[0]: p = mFix[1]
else: p = paras[-1]
I1,I2,I3 = invariant(sigmas)
#I = invariant(sigmas)
#J = np.zeros([3])
J2 = I1**2/3.0 - I2
#J[1] = I[0]**2/3.0 - I[1]
J3 = I1**3/13.5 - I1*I2/3.0 + I3
#J[2] = I[0]**3/13.5 - I[0]*I[1]/3.0 + I[2] etc.
J2_3p = J2**(3.0*p)
J3_2p = J3**(2.0*p)
left = J2_3p - C_D*J3_2p
r = left**(1.0/(6.0*p))*3.0**0.5/sigma0
if not Jac:
return (r - 1.0).ravel()
else:
drdl = r/left/(6.0*p)
if criteria == 'drucker':
return np.vstack((-r/sigma0, -drdl*J3_2p)).T
else:
dldp = 3.0*J2_3p*math_ln(J2) - 2.0*C_D*J3_2p*math_ln(J3)
jp = drdl*dldp + r*math_ln(left)/(-6.0*p*p)
if mFix[0]: return np.vstack((-r/sigma0, -drdl*J3_2p)).T
else: return np.vstack((-r/sigma0, -drdl*J3_2p, jp)).T
def Hill1948(eqStress, paras, sigmas, mFix, criteria, dim, Jac = False):
'''
Hill 1948 yield criterion
the fitted parameters are:
F, G, H, L, M, N for 3D
F, G, H, N for 2D
eqStress, mFix, criteria are invalid input
'''
s11,s22,s33,s12,s23,s31 = sigmas
if dim == 2: # plane stress
jac = np.array([ s22**2, s11**2, (s11-s22)**2, 2.0*s12**2])
else: # general case
jac = np.array([(s22-s33)**2,(s33-s11)**2,(s11-s22)**2, 2.0*s23**2,2.0*s31**2,2.0*s12**2])
if not Jac:
return (np.dot(paras,jac)/2.0-0.5).ravel()
else:
return jac.T
def Hill1979(eqStress,paras, sigmas, mFix, criteria, dim, Jac = False):
'''
Hill 1979 yield criterion
the fitted parameters are: f,g,h,a,b,c,m
criteria are invalid input
'''
if mFix[0]: m = mFix[1]
else: m = paras[-1]
coeff = paras[0:6]
s1,s2,s3 = principalStresses(sigmas)
# s= principalStresses(sigmas)
diffs = np.array([s2-s3, s3-s1, s1-s2, 2.0*s1-s2-s3, 2.0*s2-s3-s1, 2.0*s3-s1-s2])**2
#diffs = np.array([s[1]-s[2], s[2]-s[0], etc ... s1-s2, 2.0*s1-s2-s3, 2.0*s2-s3-s1, 2.0*s3-s1-s2])**2
diffsm = diffs**(m/2.0)
left = np.dot(coeff,diffsm)
r = (0.5*left)**(1.0/m)/eqStress #left = base**mi
if not Jac:
return (r-1.0).ravel()
else:
drdl, dldm = r/left/m, np.dot(coeff,diffsm*math_ln(diffs))*0.5
jm = drdl*dldm + r*math_ln(0.5*left)*(-1.0/m/m) #/(-m**2)
if mFix[0]: return np.vstack((drdl*diffsm)).T
else: return np.vstack((drdl*diffsm, jm)).T
def Hosford(eqStress, paras, sigmas, mFix, criteria, dim, Jac = False):
'''
Hosford family criteria
the fitted parameters are:
von Mises: sigma0
Hershey: (1) sigma0, a, when a is not fixed; (2) sigma0, when a is fixed
general Hosford: (1) F,G,H, a, when a is not fixed; (2) F,G,H, when a is fixed
'''
if criteria == 'vonmises':
sigma0 = paras
coeff = np.ones(3)
a = 2.0
elif criteria == 'hershey':
sigma0 = paras[0]
coeff = np.ones(3)
if mFix[0]: a = mFix[1]
else: a = paras[1]
else:
sigma0 = eqStress
coeff = paras[0:3]
if mFix[0]: a = mFix[1]
else: a = paras[3]
s1,s2,s3 = principalStresses(sigmas)
diffs = np.array([s2-s3, s3-s1, s1-s2])**2
diffsm = diffs**(a/2.0)
left = np.dot(coeff,diffsm)
r = (0.5*left)**(1.0/a)/sigma0
if not Jac:
return (r-1.0).ravel()
else:
if criteria == 'vonmises': # von Mises
return -r/sigma0
else:
drdl, dlda = r/left/a, np.dot(coeff,diffsm*math_ln(diffs))*0.5
ja = drdl*dlda + r*math_ln(0.5*left)*(-1.0/a/a)
if criteria == 'hershey': # Hershey
if mFix[0]: return -r/sigma0
else: return np.vstack((-r/sigma0, ja)).T
else: # Anisotropic Hosford
if mFix[0]: return np.vstack((drdl*diffsm)).T
else: return np.vstack((drdl*diffsm, ja)).T
def Barlat1989(eqStress, paras, sigmas, mFix, criteria, dim, Jac=False):
'''
Barlat-Lian 1989 yield criteria
the fitted parameters are:
Anisotropic: a, c, h, p, m; m is optional
'''
a, c, h, p = paras[0:4]
if mFix[0]: m = mFix[1]
else: m = paras[-1]
s11,s22,s12 = sigmas[0], sigmas[1], sigmas[3]
k1,k2 = 0.5*(s11 + h*s22), (0.25*(s11 - h*s22)**2 + (p*s12)**2)**0.5
fs = np.array([ (k1+k2)**2, (k1-k2)**2, 4.0*k2**2 ]); fm = fs**(m/2.0)
left = np.dot(np.array([a,a,c]),fm)
r = (0.5*left)**(1.0/m)/eqStress
if not Jac:
return (r-1.0).ravel()
else:
dk1dh = 0.5*s22
dk2dh, dk2dp = 0.25*(s11-h*s22)*(-s22)/k2, p*s12**2/k2
dlda, dldc = fm[0]+fm[1], fm[2]
fm1 = fs**(m/2.0-1.0)*m
dldk1, dldk2 = a*fm1[0]*(k1+k2)+a*fm1[1]*(k1-k2), a*fm1[0]*(k1+k2)-a*fm1[1]*(k1-k2)+c*fm1[2]*k2*4.0
drdl, drdm = r/m/left, r*math_ln(0.5*left)*(-1.0/m/m)
dldm = np.dot(np.array([a,a,c]),fm*math_ln(fs))*0.5
ja,jc = drdl*dlda, drdl*dldc
jh,jp = drdl*(dldk1*dk1dh + dldk2*dk2dh), drdl*dldk2*dk2dp
jm = drdl*dldm + drdm
if mFix[0]: return np.vstack((ja,jc,jh,jp)).T
else: return np.vstack((ja,jc,jh,jp,jm)).T
def Barlat1991(eqStress, paras, sigmas, mFix, criteria, dim, Jac=False):
'''
Barlat 1991 criteria
the fitted parameters are:
Isotropic: sigma0, m
Anisotropic: a, b, c, f, g, h, m for 3D
a, b, c, h, m for plane stress
m is optional
'''
sigma0 = eqStress
if dim == 2: coeff = paras[0:4] # plane stress
else: coeff = paras[0:6] # general case
if mFix[0]: m = mFix[1]
else: m = paras[-1]
cos = np.cos; sin = np.sin; pi = np.pi; abs = np.abs
s11,s22,s33,s12,s23,s31 = sigmas
if dim == 2:
dXdx = np.array([s22,s33-s11,s11-s22,s12])
A,B,C,H = np.array(coeff)[:,None]*dXdx; F=G=0.0
else:
dXdx = np.array([s22-s33,s33-s11,s11-s22,s23,s31,s12])
A,B,C,F,G,H = np.array(coeff)[:,None]*dXdx
I2 = (F*F + G*G + H*H)/3.0+ ((A-C)**2+(C-B)**2+(B-A)**2)/54.0
I3 = (C-B)*(A-C)*(B-A)/54.0 + F*G*H - ((C-B)*F*F + (A-C)*G*G + (B-A)*H*H)/6.0
phi1 = np.arccos(I3/I2**1.5)/3.0 + pi/6.0; absc1 = 2.0*abs(cos(phi1))
phi2 = phi1 + pi/3.0; absc2 = 2.0*abs(cos(phi2))
phi3 = phi2 + pi/3.0; absc3 = 2.0*abs(cos(phi3))
left = ( absc1**m + absc2**m + absc3**m )/2.0
r = left**(1.0/m)*np.sqrt(3.0*I2)/sigma0
if not Jac:
return (r - 1.0).ravel()
else:
dfdl = r/left/m
jm = r*math_ln(left)*(-1.0/m/m) + dfdl*0.5*(
absc1**m*math_ln(absc1) + absc2**m*math_ln(absc2) + absc3**m*math_ln(absc3) )
da,db,dc = (2.0*A-B-C)/18.0, (2.0*B-C-A)/18.0, (2.0*C-A-B)/18.0
if dim == 2:
dI2dx = np.array([da, db, dc, H])/1.5*dXdx
dI3dx = np.array([da*(B-C) + (H**2-G**2)/2.0, db*(C-A) + (F**2-H**2)/2.0, dc*(A-B) + (G**2-F**2)/2.0,
(G*F + (A-B))*H])/3.0*dXdx
else:
dI2dx = np.array([da, db, dc, F,G,H])/1.5*dXdx
dI3dx = np.array([da*(B-C) + (H**2-G**2)/2.0, db*(C-A) + (F**2-H**2)/2.0, dc*(A-B) + (G**2-F**2)/2.0,
(H*G + (B-C))*F, (F*H + (C-A))*G, (G*F + (A-B))*H])/3.0*dXdx
darccos = -(1.0 - I3**2/I2**3)**(-0.5)
dfdc = dfdl*0.5*m
dfdcos = lambda phi : dfdc*(2.0*abs(cos(phi)))**(1.0/m-1.0)*np.sign(cos(phi))*(-sin(phi)/1.5)
dfdthe= (dfdcos(phi1) + dfdcos(phi2) + dfdcos(phi3))
dfdI2, dfdI3 = dfdthe*darccos*I3*(-1.5)*I2**(-2.5), dfdthe*darccos*I2**(-1.5)
if mFix[0]: return np.vstack((dfdI2*dI2dx + dfdI3*dI3dx)).T
else: return np.vstack((dfdI2*dI2dx + dfdI3*dI3dx, jm)).T
def BBC2000(eqStress, paras, sigmas, mFix, criteria, dim, Jac=False):
'''
BBC2000 yield criterion
the fitted parameters are
d,e,f,g, b,c,a, k; k is optional
criteria are invalid input
'''
d,e,f,g, b,c,a= paras[0:7]
if mFix[0]: k = mFix[1]
else: k = paras[-1]
s11,s22,s12 = sigmas[0], sigmas[1], sigmas[3]
k2 = 2.0*k; k1 = k - 1.0
M,N,P,Q,R = d+e, e+f, (d-e)/2.0, (e-f)/2.0, g**2
Gamma = M*s11 + N*s22
Psi = ( (P*s11 + Q*s22)**2 + s12**2*R )**0.5
l1, l2, l3 = b*Gamma + c*Psi, b*Gamma - c*Psi, 2.0*c*Psi
l1s,l2s,l3s = l1**2, l2**2, l3**2
left = a*l1s**k + a*l2s**k + (1-a)*l3s**k
r = left**(1.0/k2)/eqStress
if not Jac:
return (r - 1.0).ravel()
else:
drdl,drdk = r/left/k2, r*math_ln(left)*(-1.0/k2/k)*eqStress ##****eqStress should be cut
dldl1,dldl2,dldl3 = a*k2*(l1s**k1)*l1, a*k2*(l2s**k1)*l2, (1-a)*k2*(l3s**k1)*l3
dldGama, dldPsi = (dldl1 + dldl2)*b, (dldl1 - dldl2 + 2.0*dldl3)*c
temp = (P*s11 + Q*s22)/Psi
dPsidP, dPsidQ, dPsidR = temp*s11, temp*s22, 0.5*s12**2/Psi
dlda = l1s**k + l2s**k - l3s**k
dldb = dldl1*Gamma + dldl2*Gamma
dldc = dldl1*Psi - dldl2*Psi + dldl3*2.0*Psi
dldk = a*math_ln(l1s)*l1s**k + a*math_ln(l2s)*l2s**k + (1-a)*math_ln(l3s)*l3s**k
J = drdl*np.array([dldGama*s11+dldPsi*dPsidP*0.5, dldGama*(s11+s22)+dldPsi*(-dPsidP+dPsidQ)*0.5, #jd,je
dldGama*s22-dldPsi*dPsidQ*0.5, dldPsi*dPsidR*2.0*g, #jf,jg
dldb, dldc, dlda]) #jb,jc,ja
if mFix[0]: return np.vstack(J).T
else: return np.vstack((J, drdl*dldk + drdk)).T
def BBC2003(eqStress, paras, sigmas, mFix, criteria, dim, Jac=False):
'''
BBC2003 yield criterion
the fitted parameters are
M,N,P,Q,R,S,T,a, k; k is optional
criteria are invalid input
'''
M,N,P,Q,R,S,T,a = paras[0:8]
if mFix[0]: k = mFix[1]
else: k = paras[-1]
s11,s22,s12 = sigmas[0], sigmas[1], sigmas[3]
k2 = 2.0*k; k1 = k - 1.0
Gamma = 0.5 * (s11 + M*s22)
Psi = ( 0.25*(N*s11 - P*s22)**2 + Q*Q*s12**2 )**0.5
Lambda = ( 0.25*(R*s11 - S*s22)**2 + T*T*s12**2 )**0.5
l1, l2, l3 = Gamma + Psi, Gamma - Psi, 2.0*Lambda
l1s,l2s,l3s = l1**2, l2**2, l3**2
left = a*l1s**k + a*l2s**k + (1-a)*l3s**k
r = left**(1.0/k2)/eqStress
if not Jac:
return (r - 1.0).ravel()
else:
drdl,drdk = r/left/k2, r*math_ln(left)*(-1.0/k2/k)*eqStress #***
dldl1,dldl2,dldl3 = a*k2*(l1s**k1)*l1, a*k2*(l2s**k1)*l2, (1-a)*k2*(l3s**k1)*l3
dldGama, dldPsi, dldLambda = dldl1+dldl2, dldl1-dldl2, 2.0*dldl3
temp = 0.25/Psi*(N*s11 - P*s22)
dPsidN, dPsidP, dPsidQ = s11*temp, -s22*temp, Q*s12**2/Psi
temp = 0.25/Lambda*(R*s11 - S*s22)
dLambdadR, dLambdadS, dLambdadT = s11*temp, -s22*temp, T*s12**2/Psi
dldk = a*math_ln(l1s)*l1s**k + a*math_ln(l2s)*l2s**k + (1-a)*math_ln(l3s)*l3s**k
J = drdl * np.array([dldGama*s22*0.5, #jM
dldPsi*dPsidN, dldPsi*dPsidP, dldPsi*dPsidQ, #jN, jP, jQ
dldLambda*dLambdadR, dldLambda*dLambdadS, dldLambda*dLambdadT, #jR, jS, jT
l1s**k + l2s**k - l3s**k ]) #ja
if mFix[0]: return np.vstack(J).T
else : return np.vstack((J, drdl*dldk+drdk)).T
def BBC2005(eqStress, paras, sigmas, mFix, criteria, dim, Jac=False):
'''
BBC2005 yield criterion
the fitted parameters are
a, b, L ,M, N, P, Q, R, k; k is optional
criteria are invalid input
'''
a,b,L, M, N, P, Q, R = paras[0:8]
if mFix[0]: k = mFix[1]
else: k = paras[-1]
s11 = sigmas[0]; s22 = sigmas[1]; s12 = sigmas[3]
k2 = 2.0*k
Gamma = L*s11 + M*s22
Lambda = ( (N*s11 - P*s22)**2 + s12**2 )**0.5
Psi = ( (Q*s11 - R*s22)**2 + s12**2 )**0.5
l1 = Lambda + Gamma; l2 = Lambda - Gamma; l3 = Lambda + Psi; l4 = Lambda - Psi
l1s = l1**2; l2s = l2**2; l3s = l3**2; l4s = l4**2
left = a*l1s**k + a*l2s**k + b*l3s**k + b*l4s**k
sBar = left**(1.0/k2); r = sBar/eqStress - 1.0
if not Jac:
return r.ravel()
else:
ln = lambda x : np.log(x + 1.0e-32)
expo = 0.5/k; k1 = k-1.0
dsBardl = expo*sBar/left/eqStress
dsBarde = sBar*ln(left); dedk = expo/(-k)
dldl1 = a*k*(l1s**k1)*(2.0*l1)
dldl2 = a*k*(l2s**k1)*(2.0*l2)
dldl3 = b*k*(l3s**k1)*(2.0*l3)
dldl4 = b*k*(l4s**k1)*(2.0*l4)
dldLambda = dldl1 + dldl2 + dldl3 + dldl4
dldGama = dldl1 - dldl2
dldPsi = dldl3 - dldl4
temp = (N*s11 - P*s22)/Lambda
dLambdadN = s11*temp; dLambdadP = -s22*temp
temp = (Q*s11 - R*s22)/Psi
dPsidQ = s11*temp; dPsidR = -s22*temp
dldk = a*ln(l1s)*l1s**k + a*ln(l2s)*l2s**k + b*ln(l3s)*l3s**k + b*ln(l4s)*l4s**k
J = dsBardl * np.array( [
l1s**k+l2s**k, l3s**k+l4s**k,dldGama*s11,dldGama*s22,dldLambda*dLambdadN,
dldLambda*dLambdadP, dldPsi*dPsidQ, dldPsi*dPsidR])
if mFix[0]: return np.vstack(J).T
else : return np.vstack(J, dldk+dsBarde*dedk).T
def Yld2000(eqStress, paras, sigmas, mFix, criteria, dim, Jac=False):
'''
C: c11,c22,c66 c12=c21=1.0 PASS
D: d11,d12,d21,d22,d66
'''
C,D = paras[0:3], paras[3:8]
if mFix[0]: m = mFix[1]
else: m = paras[-1]
sdev = np.array([sigmas[0]*2.0/3.0-sigmas[1]/3.0, sigmas[1]*2.0/3.0-sigmas[0]/3.0, sigmas[3]])
X = np.array([ C[0]*sdev[0], C[1]*sdev[1], C[2]*sdev[2] ])
Y = np.array([ D[0]*sdev[0]+ D[1]*sdev[1], D[2]*sdev[0]+ D[3]*sdev[1], D[4]*sdev[2] ])
def priStrs((sx,sy,sxy)):
temp = np.sqrt( (sx-sy)**2 + 4.0*sxy**2 )
return 0.5*(sx+sy + temp), 0.5*(sx+sy - temp)
(X1,X2), (Y1,Y2) = priStrs(X), priStrs(Y) # Principal values of X, Y
phi1, phi21, phi22 = ((X1-X2)**2)**(m/2.0), ((2.0*Y2+Y1)**2)**(m/2.0), ((2.0*Y1+Y2)**2)**(m/2.0)
left = phi1+phi21+phi22
r = (0.5*left)**(1.0/m)
if not Jac:
return (r/eqStress-1.0).ravel()
else:
def dPrincipalds((X1,X2,X12)):
# the derivative of principla with regards to stress
temp = 0.5/( (X1-X2)**2 + 4.0*X12**2 )**0.5
dP1dsi = 0.5*np.array([ 1.0+temp*2.0*(X1-X2), 1.0-temp*2.0*(X1-X2), temp*8.0*X12])
dP2dsi = 0.5*np.array([ 1.0-temp*2.0*(X1-X2), 1.0+temp*2.0*(X1-X2), -temp*8.0*X12])
return dP1dsi, dP2dsi
(dX1dXi, dX2dXi), (dY1dYi, dY2dYi) = dPrincipalds(X), dPrincipalds(Y)
dX1dCi, dX2dCi = dX1dXi*sdev,dX2dXi*sdev
s1,s2,s12 = sdev
dY1dDi, dY2dDi = np.array([dY1dYi[0]*s1, dY1dYi[0]*s2, dY1dYi[1]*s1, dY1dYi[1]*s2, dY1dYi[2]*s12]), \
np.array([dY2dYi[0]*s1, dY2dYi[0]*s2, dY2dYi[1]*s1, dY2dYi[1]*s2, dY2dYi[2]*s12])
dldX1, dldX2 = phi1* m/(X1-X2), phi1*m/(X2-X1)
dldY1, dldY2 = phi21*m/(2.0*Y2+Y1) + 2.0*phi22*m/(2.0*Y1+Y2), \
phi22*m/(2.0*Y1+Y2) + 2.0*phi21*m/(2.0*Y2+Y1)
drdl, drdm = r/m/left, r*math_ln(0.5*left)/(-m*m)
dldm = ( phi1*math_ln((X1-X2)**2) + phi21*math_ln((2.0*Y2+Y1)**2) + phi22*math_ln((2.0*Y1+Y2)**2) )*0.5
jC,jD= drdl*(dldX1*dX1dCi + dldX2*dX2dCi), drdl*(dldY1*dY1dDi + dldY2*dY2dDi)
jm = drdl*dldm + drdm
if mFix[0]: return np.vstack((jC,jD)).T
else: return np.vstack((jC,jD,jm)).T
def Yld200418p(eqStress, paras, sigmas, mFix, criteria, dim, Jac=False):
'''
Yld2004-18p yield criterion
the fitted parameters are
C: c12,c21,c23,c32,c13,c31,c44,c55,c66; D: d12,d21,d23,d32,d31,d13,d44,d55,d66 for 3D
C: c12,c21,c23,c32,c13,c31,c44; D: d12,d21,d23,d32,d31,d13,d44 for 2D
and m, m is optional
criteria are invalid input
'''
if dim == 2: C,D = np.append(paras[0:7],[0.0,0.0]), np.append(paras[7:14],[0.0,0.0])
else: C,D = paras[0:9], paras[9:18]
if mFix[0]: m = mFix[1]
else: m = paras[-1]
sv = (sigmas[0] + sigmas[1] + sigmas[2])/3.0
sdev = np.vstack((sigmas[0:3]-sv,sigmas[3:6]))
ys = lambda sdev, C: np.array([-C[0]*sdev[1]-C[5]*sdev[2], -C[1]*sdev[0]-C[2]*sdev[2],
-C[4]*sdev[0]-C[3]*sdev[1], C[6]*sdev[3], C[7]*sdev[4], C[8]*sdev[5]])
p,q = ys(sdev, C), ys(sdev, D)
pLambdas, qLambdas = principalStress(p), principalStress(q) # no sort
m2 = m/2.0; x3 = xrange(3); num = len(sv)
PiQj = np.array([(pLambdas[i,:]-qLambdas[j,:]) for i in x3 for j in x3])
QiPj = np.array([(qLambdas[i,:]-pLambdas[j,:]) for i in x3 for j in x3]).reshape(3,3,num)
PiQjs = PiQj**2
left = np.sum(PiQjs**m2,axis=0)
r = (0.25*left)**(1.0/m)/eqStress
if not Jac:
return (r - 1.0).ravel()
else:
drdl, drdm = r/m/left, r*math_ln(0.25*left)*(-1.0/m/m)
dldm = np.sum(PiQjs**m2*math_ln(PiQjs),axis=0)*0.5
dPdc, dQdd = principalStrs_Der(p, sdev, dim), principalStrs_Der(q, sdev, dim)
PiQjs3d = ( PiQjs**(m2-1.0) ).reshape(3,3,num)
dldP = -m*np.array([np.diag(np.dot(PiQjs3d[:,:,i], QiPj [:,:,i])) for i in xrange(num)]).T
dldQ = m*np.array([np.diag(np.dot(QiPj [:,:,i], PiQjs3d[:,:,i])) for i in xrange(num)]).T
jm = drdl*dldm + drdm
jc = drdl*np.sum([dldP[i]*dPdc[i] for i in x3],axis=0)
jd = drdl*np.sum([dldQ[i]*dQdd[i] for i in x3],axis=0)
if mFix[0]: return np.vstack((jc,jd)).T
else: return np.vstack((jc,jd,jm)).T
def KarafillisBoyce(eqStress, paras, sigmas, mFix, criteria, dim, Jac=False):
'''
Karafillis-Boyce yield criterion
the fitted parameters are
c11,c12,c13,c14,c15,c16,c21,c22,c23,c24,c25,c26,alpha,b1,b2,a for 3D
c11,c12,c13,c14,c21,c22,c23,c24,alpha,b1,b2,a for plane stress
0<alpha<1, b1,b2,a are optional
criteria are invalid input
'''
ks = lambda (s1,s2,s3,s4,s5,s6),(c1,c2,c3,c4,c5,c6): np.array( [
((c2+c3)*s1-c3*s2-c2*s3)/3.0, ((c3+c1)*s2-c3*s1-c1*s3)/3.0,
((c1+c2)*s3-c2*s1-c1*s2)/3.0, c4*s4, c5*s5, c6*s6 ])
if dim == 2: C1,C2,alpha = np.append(paras[0:4],[0.0,0.0]), np.append(paras[4:8],[0.0,0.0]), paras[8]
else: C1,C2,alpha = paras[0:6], paras[6:12], paras[12]
if mFix[0]: b1=b2=a = mFix[1]
else: b1,b2,a = paras[len(paras)-3:len(paras)]
p,q = ks(sigmas, C1), ks(sigmas, C2)
plambdas,qlambdas = principalStress(p), principalStress(q)
b1i,b2i,ai,rb2 = 1.0/b1, 1.0/b2, 1.0/a, 3.0**b2/(2.0**b2+2.0)
difP = np.array([plambdas[1]-plambdas[2], plambdas[2]-plambdas[0], plambdas[0]-plambdas[1]])
difPs = difP**2; difPb1 = difPs**(b1/2.0-1.0)
Qs = qlambdas**2
phi10, phi20 = np.sum(difPs**(b1/2.0),axis = 0), np.sum(Qs**(b2/2.0),axis = 0)
phi1, phi2 = (0.5*phi10)**b1i, (rb2*phi20)**b2i
Stress = alpha*phi1**a + (1.0-alpha)*phi2**a
r = Stress**ai/eqStress
if not Jac:
return (r-1.0).ravel()
else:
drds = r*ai/Stress
dsda = alpha*phi1**a*math_ln(phi1) + (1.0-alpha)*phi2**a*math_ln(phi2)
dphi1dP = phi1/phi10*np.array([ -difPb1[1]*difP[1]+difPb1[2]*difP[2],
difPb1[0]*difP[0]-difPb1[2]*difP[2], difPb1[1]*difP[1]-difPb1[0]*difP[0]])
dphi2dQ = phi2/phi20*Qs*qlambdas*(b2/2.0-1.0)
dPdc = principalStrs_Der(p, sigmas, dim, Karafillis=True)
dQdc = principalStrs_Der(q, sigmas, dim, Karafillis=True)
dphi10db1 = np.sum(difPs**(b1/2.0)*math_ln(difPs), axis=0)*0.5
dphi20db2 = np.sum( Qs**(b2/2.0)*math_ln( Qs), axis=0)*0.5
drb2db2 = rb2*math_ln(3.0) - rb2*math_ln(2.0)/(1.0+2.0**(1.0-b2))
dphi1db1 = phi1*math_ln(phi10)*(-b1i*b1i) + b1i*phi1/(0.5*phi10)* 0.5*dphi10db1
dphi2db2 = phi2*math_ln(phi20)*(-b2i*b2i) + b2i*phi2/(rb2*phi20)*(rb2*dphi20db2 + drb2db2*phi20)
ja = drds*dsda + r*math_ln(Stress)*(-1.0/a/a) #drda
jb1 = dphi1db1*(drds*a*phi1**(a-1)*alpha )
jb2 = dphi2db2*(drds*a*phi2**(a-1)*(1.0-alpha))
jc1 = np.sum([dphi1dP[i]*dPdc[i] for i in xrange(3)],axis=0)*drds*a*phi1**(a-1.0)*alpha
jc2 = np.sum([dphi2dQ[i]*dQdc[i] for i in xrange(3)],axis=0)*drds*a*phi2**(a-1.0)*(1.0-alpha)
jalpha = drds * (phi1**a - phi2**a)
if mFix[0]: return np.vstack((jc1,jc2,jalpha)).T
else: return np.vstack((jc1,jc2,jalpha,jb1,jb2,ja)).T
fitCriteria = {
'tresca' :{'func' : Tresca,
'nExpo': 0,'err':np.inf,
'bound': [ [(None,None)] ],
'paras': [ 'sigma0' ],
'text' : '\nCoefficient of Tresca criterion: ',
'error': 'The standard deviation error is: '
},
'vonmises' :{'func' : Hosford,
'nExpo': 0,'err':np.inf,
'bound': [ [(None,None)] ],
'paras': [ 'sigma0' ],
'text' : '\nCoefficient of Huber-Mises-Hencky criterion: ',
'error': 'The standard deviation error is: '
},
'hershey' :{'func' : Hosford,
'nExpo': 1,'err':np.inf,
'bound': [ [(None,None)]+[(1.0,8.0)] ],
'paras': [ 'sigma0, a' ],
'text' : '\nCoefficients of Hershey criterion: ',
'error': 'The standard deviation errors are: '
},
'ghosford' :{'func' : Hosford,
'nExpo': 1,'err':np.inf,
'bound': [ [(0.0,2.0)]*3+[(1.0,8.0)] ],
'paras': [ 'F, G, H, a' ],
'text' : '\nCoefficients of Hosford criterion: ',
'error': 'The standard deviation errors are: '
},
'hill1948' :{'func' : Hill1948,
'nExpo': 0,'err':np.inf,
'bound': [ [(None,None)]*6, [(None,None)]*4 ],
'paras': [ 'F, G, H, L, M, N', 'F, G, H, N'],
'text' : '\nCoefficients of Hill1948 criterion: ',
'error': 'The standard deviation errors are: '
},
'hill1979' :{'func' : Hill1979,
'nExpo': 1,'err':np.inf,
'bound': [ [(-2.0,2.0)]*6+[(1.0,8.0)] ],
'paras': [ 'f,g,h,a,b,c,m' ],
'text' : '\nCoefficients of Hill1979 criterion: ' ,
'error': 'The standard deviation errors are: '
},
'drucker' :{'func' : Drucker,
'nExpo': 0,'err':np.inf,
'bound': [ [(None,None)]+[(-3.375, 2.25)] ],
'paras': [ 'sigma0, C_D' ],
'text' : '\nCoefficients of Drucker criterion: ',
'error': 'The standard deviation errors are: '
},
'gdrucker' :{'func' : Drucker,
'nExpo': 1,'err':np.inf,
'bound': [ [(None,None)]+[(-3.375, 2.25)]+[(1.0,8.0)] ],
'paras': [ 'sigma0, C_D, p' ],
'text' : '\nCoefficients of general Drucker criterion: ',
'error': 'The standard deviation errors are: '
},
'barlat1989' :{'func' : Barlat1989,
'nExpo': 1,'err':np.inf,
'bound': [ [(-3.0,3.0)]*4+[(1.0,8.0)] ],
'paras': [ 'a,c,h,f, m' ],
'text' : '\nCoefficients of isotropic Barlat 1989 criterion: ',
'error': 'The standard deviation errors are: '
},
'barlat1991' :{'func' : Barlat1991,
'nExpo': 1,'err':np.inf,
'bound': [ [(-2,2)]*6+[(1.0,8.0)], [(-2,2)]*4+[(1.0,8.0)] ],
'paras': ['a, b, c, f, g, h, m', 'a, b, c, f, m'],
'text' : '\nCoefficients of anisotropic Barlat 1991 criterion: ',
'error': 'The standard deviation errors are: '
},
'bbc2000' :{'func' : BBC2000,
'nExpo': 1,'err':np.inf,
'bound': [ [(None,None)]*7+[(1.0,8.0)] ], #[(None,None)]*6+[(0.0,1.0)]+[(1.0,9.0)],
'paras': [ 'd,e,f,g, b,c,a, k' ],
'text' : '\nCoefficients of Banabic-Balan-Comsa 2000 criterion: ',
'error': 'The standard deviation errors are: '
},
'bbc2003' :{'func' : BBC2003,
'nExpo': 1,'err':np.inf,
'bound': [ [(None,None)]*8+[(1.0,8.0)] ], #[(None,None)]*7+[(0.0,1.0)]+[(1.0,9.0)],
'paras': [ 'M, N, P, Q, R, S, T, a, k' ],
'text' : '\nCoefficients of Banabic-Balan-Comsa 2003 criterion: ',
'error': 'The standard deviation errors are: '
},
'bbc2005' :{'func' : BBC2005,
'nExpo': 1,'err':np.inf,
'bound': [ [(None,None)]*8+[(1.0,8.0)] ], #[(None,None)]*6+[(0.0,1.0)]*2+[(1.0,9.0)],
'paras': [ 'L ,M, N, P, Q, R, a, b, k' ],
'text' : '\nCoefficients of Banabic-Balan-Comsa 2005 criterion: ',
'error': 'The standard deviation errors are: '
},
'cazacu' :{'func' : Cazacu_Barlat,
'nExpo': 0,'err':np.inf,
'bound': [ [(None,None)]*16+[(-2.5,2.5)]+[(None,None)] ],
'paras': [ 'a1,a2,a3,a4,a5,a6; b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11; c','a1,a2,a3,a6; b1,b2,b3,b4,b5,b10; c'],
'text' : '\nCoefficients of Cazacu Barlat yield criterion: ',
'error': 'The standard deviation errors are: '
},
'yld2000' :{'func' : Yld2000,
'nExpo': 1,'err':np.inf,
'bound': [ [(None,None)]*8+[(1.0,8.0)] ],
'paras': [ 'a1,a2,a7,a3,a4,a5,a6,a8,m' ],
'text' : '\nCoefficients of Yld2000-2D yield criterion: ',
'error': 'The standard deviation errors are: '
},
'yld200418p' :{'func' : Yld200418p,
'nExpo': 1,'err':np.inf,
'bound': [ [(None,None)]*18+[(1.0,8.0)], [(None,None)]*14+[(1.0,8.0)] ],
'paras': [ 'c12,c21,c23,c32,c31,c13,c44,c55,c66,d12,d21,d23,d32,d31,d13,d44,d55,d66,m', \
'c12,c21,c23,c32,c31,c13,c44,d12,d21,d23,d32,d31,d13,d44,m' ],
'text' : '\nCoefficients of Yld2004-18p yield criterion: ',
'error': 'The standard deviation errors are: '
},
'karafillis' :{'func' : KarafillisBoyce,
'nExpo': 3,'err':np.inf,
'bound': [ [(None,None)]*12+[(0.0,1.0)]+[(1.0,8.0)]*3, [(None,None)]*8+[(0.0,1.0)]+[(1.0,8.0)]*3],
'paras': [ 'c11,c12,c13,c14,c15,c16,c21,c22,c23,c24,c25,c26,alpha,b1,b2,a', \
'c11,c12,c13,c14,c21,c22,c23,c24,alpha,b1,b2,a' ],
'text' : '\nCoefficients of Karafillis-Boyce yield criterion: ',
'error': 'The standard deviation errors are: '
}
}
thresholdParameter = ['totalshear','equivalentStrain']
#---------------------------------------------------------------------------------------------------
class Loadcase():
#---------------------------------------------------------------------------------------------------
'''
Class for generating load cases for the spectral solver
'''
# ------------------------------------------------------------------
def __init__(self,finalStrain,incs,time,ND=3,RD=1,nSet=1,dimension=3,vegter=False):
print('using the random load case generator')
self.finalStrain = finalStrain
self.incs = incs
self.time = time
self.ND = ND
self.RD = RD
self.nSet = nSet
self.dimension = dimension
self.vegter = vegter
self.NgeneratedLoadCases = 0
if self.vegter:
self.vegterLoadcase = self._vegterLoadcase()
def getLoadcase(self,number):
if self.dimension == 3:
print 'generate random 3D load case'
return self._getLoadcase3D()
else:
if self.vegter is True:
print 'generate load case for Vegter'
return self._getLoadcase2dVegter(number)
else:
print 'generate random 2D load case'
return self._getLoadcase2dRandom()
def _getLoadcase3D(self):
self.NgeneratedLoadCases+=1
defgrad=['*']*9
stress =[0]*9
values=(np.random.random_sample(9)-.5)*self.finalStrain*2
main=np.array([0,4,8])
np.random.shuffle(main)
for i in main[:2]: # fill 2 out of 3 main entries
defgrad[i]=1.+values[i]
stress[i]='*'
for off in [[1,3,0],[2,6,0],[5,7,0]]: # fill 3 off-diagonal pairs of defgrad (1 or 2 entries)
off=np.array(off)
np.random.shuffle(off)
for i in off[0:2]:
if i != 0:
defgrad[i]=values[i]
stress[i]='*'
ratio = self._defgradScale(defgrad)
for i in [0,4,8]:
if defgrad[i] != '*': defgrad[i] = (defgrad[i]-1.0)*ratio + 1.0
for i in [1,2,3,5,6,7]:
if defgrad[i] != '*': defgrad[i] = defgrad[i]*ratio
return 'f '+' '.join(str(c) for c in defgrad)+\
' p '+' '.join(str(c) for c in stress)+\
' incs %s'%self.incs+\
' time %s'%self.time
def _getLoadcase2dVegter(self,number): #for a 2D simulation, I would use this generator before switching to a random 2D generator
NDzero=[[1,2,3,6],[1,3,5,7],[2,5,6,7]] # no deformation / * for stress
# biaxial f1 = f2
# shear f1 = -f2
# unixaial f1 , f2 =0
# plane strain f1 , s2 =0
# modulo to get one out of 4
stress =['*', '*', '0']*3
defgrad = self.vegterLoadcase[number-1]
return 'f '+' '.join(str(c) for c in defgrad)+\
' p '+' '.join(str(c) for c in stress)+\
' incs %s'%self.incs+\
' time %s'%self.time
def _vegterLoadcase(self):
'''
generate the stress points for Vegter criteria
'''
theta = np.linspace(0.0,np.pi/2.0,self.nSet)
f = [0.0, 0.0, '*']*3; loadcase = []
for i in xrange(self.nSet*4): loadcase.append(f)
# more to do for F
F = np.array([ [[1.1, 0.1], [0.1, 1.1]], # uniaxial tension
[[1.1, 0.1], [0.1, 1.1]], # shear
[[1.1, 0.1], [0.1, 1.1]], # eq-biaxial
[[1.1, 0.1], [0.1, 1.1]], # eq-biaxial
])
# for i,t in enumerate(theta):
# R = np.array([np.cos(t), np.sin(t), -np.sin(t), np.cos(t)]).reshape(2,2)
# for j in xrange(4):
# loadcase[i*4+j][0],loadcase[i*4+j][1],loadcase[i*4+j][3],loadcase[i*4+j][4] = np.dot(R.T,np.dot(F[j],R)).reshape(4)
# return loadcase
def _getLoadcase2dRandom(self):
'''
generate random stress points for 2D tests
'''
self.NgeneratedLoadCases+=1
defgrad=['0', '0', '*']*3
stress =['*', '*', '0']*3
defgrad[0],defgrad[1],defgrad[3],defgrad[4] = (np.random.random_sample(4)-.5)*self.finalStrain*2.0 + np.eye(2).reshape(4)
return 'f '+' '.join(str(c) for c in defgrad)+\
' p '+' '.join(str(c) for c in stress)+\
' incs %s'%self.incs+\
' time %s'%self.time
def _defgradScale(self, defgrad):
'''
'''
def fill_star(a,b):
if a != '*' and b != '*': return a,b
elif a == '*' and b != '*': return b,b
elif a != '*' and b == '*': return a,a
else : return 0.0,0.0
defgrad0 = defgrad[:]
defgrad0[1],defgrad0[3] = fill_star(defgrad[1], defgrad[3])
defgrad0[2],defgrad0[6] = fill_star(defgrad[2], defgrad[6])
defgrad0[5],defgrad0[7] = fill_star(defgrad[5], defgrad[7])
for i in [0,4,8]:
if defgrad0[i] == '*': defgrad0[i] = 0.0
det0 = 1.0 - np.linalg.det(np.array(defgrad0).reshape(3,3))
if defgrad0[0] == 0.0: defgrad0[0] = det0/(defgrad0[4]*defgrad0[8]-defgrad0[5]*defgrad0[7])
if defgrad0[4] == 0.0: defgrad0[4] = det0/(defgrad0[0]*defgrad0[8]-defgrad0[2]*defgrad0[6])
if defgrad0[8] == 0.0: defgrad0[8] = det0/(defgrad0[0]*defgrad0[4]-defgrad0[1]*defgrad0[3])
strain = 0.5*(np.dot(np.array(defgrad0).reshape(3,3).T,np.array(defgrad0).reshape(3,3)) - np.eye(3)) #Green Strain
eqstrain = 2.0/3.0*np.sqrt( 1.5*(strain[0][0]**2+strain[1][1]**2+strain[2][2]**2) +
3.0*(strain[0][1]**2+strain[1][2]**2+strain[2][0]**2) )
ratio = self.finalStrain*1.05/eqstrain
return max(ratio,1.0)
#---------------------------------------------------------------------------------------------------
class Criterion(object):
#---------------------------------------------------------------------------------------------------
'''
Fitting to certain criterion
'''
def __init__(self, exponent, uniaxial, dimension, name='vonmises'):
self.name = name
self.expo = exponent
self.uniaxial= uniaxial
self.dimen = dimension
self.results = fitCriteria
if self.name.lower() not in map(str.lower, self.results.keys()):
raise Exception('no suitable fitting criterion selected')
else:
print('fitting to the %s criterion'%name)
def fit(self,stress):
global fitResults; fitErrors; fitResidual
if options.exponent > 0.0: nExponent = nExpo
else: nExponent = 0
nameCriterion = self.name.lower()
criteria = Criteria(nameCriterion,self.uniaxial,self.expo, self.dimen)
textParas = fitCriteria[nameCriterion]['text']+fitCriteria[nameCriterion]['paras'][dDim]+':\n' + \
formatOutput(numParas+nExponent)
textError = fitCriteria[nameCriterion]['error']+ formatOutput(numParas+nExponent,'%-14.8f')+'\n'
bounds = fitCriteria[nameCriterion]['bound'][dDim] # Default bounds, no bound
guess0 = Guess # Default initial guess, depends on bounds
if fitResults == [] : initialguess = guess0
else : initialguess = np.array(fitResults[-1])
weight = get_weight(np.shape(stress)[1])
ydata = np.zeros(np.shape(stress)[1])
try:
popt, pcov, infodict, errmsg, ierr = \
leastsqBound (criteria.fun, initialguess, args=(ydata,stress),
bounds=bounds, Dfun=criteria.jac, full_output=True)
if ierr not in [1, 2, 3, 4]:
raise RuntimeError("Optimal parameters not found: " + errmsg)
else:
residual = criteria.fun(popt, ydata, stress)
fitResidual.append(np.linalg.norm(residual)/len(residual))
if (len(ydata) > len(initialguess)) and pcov is not None:
s_sq = (criteria.fun(popt, *(ydata,stress))**2).sum()/(len(ydata)-len(initialguess))
pcov = pcov * s_sq
perr = np.sqrt(np.diag(pcov))
fitResults.append(popt.tolist())
fitErrors .append(perr.tolist())
popt = np.concatenate((np.array(popt), np.repeat(options.exponent,nExponent)))
perr = np.concatenate((np.array(perr), np.repeat(0.0,nExponent)))
print (textParas%array2tuple(popt))
print (textError%array2tuple(perr))
print('Number of function calls =', infodict['nfev'])
except Exception as detail:
print detail
pass
#---------------------------------------------------------------------------------------------------
class myThread (threading.Thread):
#---------------------------------------------------------------------------------------------------
'''
Runner class
'''
def __init__(self, threadID):
threading.Thread.__init__(self)
self.threadID = threadID
def run(self):
s.acquire()
conv=converged()
s.release()
while not conv:
doSim(4.,self.name)
s.acquire()
conv=converged()
s.release()
def doSim(delay,thread):
s.acquire()
loadNo=loadcaseNo()
if not os.path.isfile('%s.load'%loadNo):
print('generating loadcase for sim %s from %s'%(loadNo,thread))
f=open('%s.load'%loadNo,'w')
f.write(myLoad.getLoadcase(loadNo))
f.close()
s.release()
else: s.release()
s.acquire()
if not os.path.isfile('%s_%i.spectralOut'%(options.geometry,loadNo)):
print('starting simulation %s from %s'%(loadNo,thread))
s.release()
execute('DAMASK_spectral -g %s -l %i'%(options.geometry,loadNo))
else: s.release()
s.acquire()
if not os.path.isfile('./postProc/%s_%i.txt'%(options.geometry,loadNo)):
print('starting post processing for sim %i from %s'%(loadNo,thread))
s.release()
try:
execute('postResults --cr f,p --co totalshear %s_%i.spectralOut'%(options.geometry,loadNo))
except:
execute('postResults --cr f,p %s_%i.spectralOut'%(options.geometry,loadNo))
execute('addCauchy ./postProc/%s_%i.txt'%(options.geometry,loadNo))
execute('addStrainTensors -l -v ./postProc/%s_%i.txt'%(options.geometry,loadNo))
execute('addMises -s Cauchy -e ln(V) ./postProc/%s_%i.txt'%(options.geometry,loadNo))
else: s.release()
s.acquire()
print('-'*10)
print('reading values for sim %i from %s'%(loadNo,thread))
s.release()
refFile = open('./postProc/%s_%i.txt'%(options.geometry,loadNo))
table = damask.ASCIItable(refFile)
table.head_read()
if options.fitting =='equivalentStrain':
thresholdKey = 'Mises(ln(V))'
elif options.fitting =='totalshear':
thresholdKey = 'totalshear'
s.acquire()
for l in [thresholdKey,'1_Cauchy']:
if l not in table.labels: print '%s not found'%l
s.release()
table.data_readArray(['%i_Cauchy'%(i+1) for i in xrange(9)]+[thresholdKey]+['%i_ln(V)'%(i+1) for i in xrange(9)])
line = 0
lines = np.shape(table.data)[0]
yieldStress = np.empty((int(options.yieldValue[2]),6),'d')
deformationRate = np.empty((int(options.yieldValue[2]),6),'d')
for i,threshold in enumerate(np.linspace(options.yieldValue[0],options.yieldValue[1],options.yieldValue[2])):
while line < lines:
if abs(table.data[line,9])>= threshold:
upper,lower = abs(table.data[line,9]),abs(table.data[line-1,9]) # values for linear interpolation
stress = np.array(table.data[line-1,0:9] * (upper-threshold)/(upper-lower) + \
table.data[line ,0:9] * (threshold-lower)/(upper-lower)).reshape(3,3) # linear interpolation of stress values
#stress = 0.5*(stress+stress.T) # symmetrise
#for the mapping, a fuction from DAMASK (33to6) simplifies
dstrain= np.array(table.data[line,10:] - table.data[line-1,10:]).reshape(3,3)
#
yieldStress[i,0]= stress[0,0]; yieldStress[i,1]=stress[1,1]; yieldStress[i,2]=stress[2,2]
yieldStress[i,3]=(stress[0,1] + stress[1,0])/2.0 # 0 3 5
yieldStress[i,4]=(stress[1,2] + stress[2,1])/2.0 # * 1 4 yieldStress
yieldStress[i,5]=(stress[2,0] + stress[0,2])/2.0 # * * 2
# D*dt = 0.5(L+L^T)*dt = 0.5*d(lnF + lnF^T) = dlnV
deformationRate[i,0]= dstrain[0,0]; deformationRate[i,1]=dstrain[1,1]; deformationRate[i,2]=dstrain[2,2]
deformationRate[i,3]=(dstrain[0,1] + dstrain[1,0])/2.0 # 0 3 5
deformationRate[i,4]=(dstrain[1,2] + dstrain[2,1])/2.0 # * 1 4
deformationRate[i,5]=(dstrain[2,0] + dstrain[0,2])/2.0 # * * 2
break
else:
line+=1
s.acquire()
global stressAll, strainAll
print('number of yield points of sim %i: %i'%(loadNo,len(yieldStress)))
print('starting fitting for sim %i from %s'%(loadNo,thread))
try:
for i in xrange(int(options.yieldValue[2])):
stressAll[i]=np.append(stressAll[i], yieldStress[i]/unitGPa)
strainAll[i]=np.append(strainAll[i], deformationRate[i])
myFit.fit(stressAll[i].reshape(len(stressAll[i])//6,6).transpose())
except Exception as detail:
print('could not fit for sim %i from %s'%(loadNo,thread))
print detail
s.release()
return
s.release()
def loadcaseNo():
global N_simulations
N_simulations+=1
return N_simulations
def converged():
global N_simulations; fitResidual
if N_simulations < options.max:
if len(fitResidual) > 5:
residualList = np.array(fitResidual[len(fitResidual)-5:])
if np.std(residualList)/np.max(residualList) < 0.05: return True
return False
else:
return True
# --------------------------------------------------------------------
# MAIN
# --------------------------------------------------------------------
parser = OptionParser(option_class=damask.extendableOption, usage='%prog options [file[s]]', description = """
Performs calculations with various loads on given geometry file and fits yield surface.
""", version=string.replace(scriptID,'\n','\\n')
)
# maybe make an option to specifiy if 2D/3D fitting should be done?
parser.add_option('-l','--load' , dest='load', type='float', nargs=3,
help='load: final strain; increments; time %default', metavar='float int float')
parser.add_option('-g','--geometry', dest='geometry', type='string',
help='name of the geometry file [%default]', metavar='string')
parser.add_option('-c','--criterion', dest='criterion', choices=fitCriteria.keys(),
help='criterion for stopping simulations [%default]', metavar='string')
# best/worse fitting? Stopping?
parser.add_option('-f','--fitting', dest='fitting', choices=thresholdParameter,
help='yield criterion [%default]', metavar='string')
parser.add_option('-y','--yieldvalue', dest='yieldValue', type='float', nargs=3,
help='yield points: start; end; count %default', metavar='float float int')
parser.add_option('--min', dest='min', type='int',
help='minimum number of simulations [%default]', metavar='int')
parser.add_option('--max', dest='max', type='int',
help='maximum number of iterations [%default]', metavar='int')
parser.add_option('-t','--threads', dest='threads', type='int',
help='number of parallel executions [%default]', metavar='int')
parser.add_option('-b','--bound', dest='bounds', type='float', nargs=2,
help='yield points: start; end; count %default', metavar='float float')
parser.add_option('-d','--dimension', dest='dimension', type='int',
help='dimension of the virtual test [%default]', metavar='int')
parser.add_option('-v', '--vegter', dest='vegter', action='store_true',
help='Vegter criteria [%default]', metavar='float')
parser.add_option('-e', '--exponent', dest='exponent', type='float',
help='exponent of non-quadratic criteria', metavar='int')
parser.add_option('-u', '--uniaxial', dest='eqStress', type='float',
help='Equivalent stress', metavar='float')
parser.set_defaults(min = 12)
parser.set_defaults(max = 30)
parser.set_defaults(threads = 4)
parser.set_defaults(yieldValue = (0.002,0.004,2))
parser.set_defaults(load = (0.010,100,100.0))
parser.set_defaults(criterion = 'vonmises')
parser.set_defaults(fitting = 'totalshear')
parser.set_defaults(geometry = '20grains16x16x16')
parser.set_defaults(bounds = None)
parser.set_defaults(dimension = 3)
parser.set_defaults(vegter = 'False')
parser.set_defaults(exponent = -1.0)
options = parser.parse_args()[0]
if not os.path.isfile(options.geometry+'.geom'):
parser.error('geometry file %s.geom not found'%options.geometry)
if not os.path.isfile('material.config'):
parser.error('material.config file not found')
if options.threads<1:
parser.error('invalid number of threads %i'%options.threads)
if options.min<0:
parser.error('invalid minimum number of simulations %i'%options.min)
if options.max<options.min:
parser.error('invalid maximum number of simulations (below minimum)')
if options.yieldValue[0]>options.yieldValue[1]:
parser.error('invalid yield start (below yield end)')
if options.yieldValue[2] != int(options.yieldValue[2]):
parser.error('count must be an integer')
if options.dimension not in [2,3]:
parser.error('Dimension is wrong, should be 2(plane stress state) or 3(general stress state)')
if options.criterion not in ['tresca', 'vonmises', 'hershey','drucker', 'gdrucker', 'hill1948']:
if options.eqStress == None:
parser.error("The equivalent stress is indispensable for the yield criterion '"+ options.criterion+"'")
if not os.path.isfile('numerics.config'):
print('numerics.config file not found')
if not os.path.isfile('material.config'):
print('material.config file not found')
dDim = options.dimension - 3
numParas = len(fitCriteria[options.criterion]['bound'][dDim])
nExpo = fitCriteria[options.criterion]['nExpo']
Guess = []
if options.exponent > 0.0:
numParas = numParas-nExpo # User defines the exponents
fitCriteria[options.criterion]['bound'][dDim] = fitCriteria[options.criterion]['bound'][dDim][:numParas]
for i in xrange(numParas):
temp = fitCriteria[options.criterion]['bound'][dDim][i]
if fitCriteria[options.criterion]['bound'][dDim][i] == (None,None): Guess.append(1.0)
else:
g = (temp[0]+temp[1])/2.0
if g == 0: g = temp[1]*0.5
Guess.append(g)
if options.vegter is True:
options.dimension = 2
unitGPa = 10.e5
N_simulations=0
s=threading.Semaphore(1)
myLoad = Loadcase(options.load[0],options.load[1],options.load[2],
nSet = 10, dimension = options.dimension, vegter = options.vegter)
stressAll= [np.zeros(0,'d').reshape(0,0) for i in xrange(int(options.yieldValue[2]))]
strainAll= [np.zeros(0,'d').reshape(0,0) for i in xrange(int(options.yieldValue[2]))]
fitResults = []; fitErrors = []; fitResidual = []; threads=[]
myFit = Criterion(options.exponent,options.eqStress, options.dimension, options.criterion)
for i in range(options.threads):
threads.append(myThread(i))
threads[i].start()
for i in range(options.threads):
threads[i].join()
print 'Finished fitting to yield criteria'