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1.compact all the criteria into a single Class; 

2.the first thorough check of the script;
3.add the option of exponents for all non-quadratic yield criteria, now the user 1)can specify the exponent, for example, m=6 for Barlat 1991, or 2)see the exponent as an undetermined parameters;
4.add the pre-specified bounds for all criteria;
5.add the user defined equivalent stress for some anisotropic yield criteria
This commit is contained in:
Haiming Zhang 2015-04-02 12:08:55 +00:00
parent b6481c2513
commit d8a99b23bf
1 changed files with 329 additions and 365 deletions
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686
processing/misc/yieldSurface.py
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@ -38,6 +38,62 @@ def principalStresses(sigmas):
lambdas = np.transpose(lambdas.reshape(np.shape(sigmas)[1],3)) lambdas = np.transpose(lambdas.reshape(np.shape(sigmas)[1],3))
return lambdas return lambdas
def principalStress(p):
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 = I1s3I2**(-3.0)
cs = 0.5*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), Karafillis=False):
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 = I1s3I2**(-3.0)
cs = 0.5*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 = 0.5*(6.0*I1**2 - 9.0*I2)*denom + dcsddenom*(2.0*I1)
dcsdI2 = 0.5*( - 9.0*I1)*denom + dcsddenom*(-3.0)
dcsdI3 = 13.5*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); dim = 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(dim)]).T
return np.concatenate((np.array([np.dot(dSdp[:,0:3,i], dpdc[:,:,i].T).T/3.0 for i in xrange(dim)]).T,
np.vstack([dSdp[:,3]*s4,dSdp[:,4]*s5,dSdp[:,5]*s6]).T.reshape(dim,3,3).T), axis=1)
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(dim)]).T
def invariant(sigmas): def invariant(sigmas):
s11,s22,s33,s12,s23,s31 = sigmas s11,s22,s33,s12,s23,s31 = sigmas
I1 = s11 + s22 + s33 I1 = s11 + s22 + s33
@ -73,195 +129,23 @@ def get_weight(ndim):
# isotropic yield surfaces # isotropic yield surfaces
# --------------------------------------------------------------------------------------------- # ---------------------------------------------------------------------------------------------
class Tresca(object): class Criteria(object):
'''
residuum of Tresca yield criterion (eq. 2.26)
'''
def __init__(self, uniaxialStress):
self.stress0 = uniaxialStress
def fun(self,sigma0, ydata, sigmas):
lambdas = principalStresses(sigmas)
r = np.amax(np.array([abs(lambdas[2,:]-lambdas[1,:]),\
abs(lambdas[1,:]-lambdas[0,:]),\
abs(lambdas[0,:]-lambdas[2,:])]),0) - sigma0
return r.ravel()
def jac(self,sigma0, ydata, sigmas):
return np.ones(len(ydata)) * (-1.0)
class vonMises(object):
'''
residuum of Huber-Mises-Hencky yield criterion (eq. 2.37)
'''
def __init__(self, uniaxialStress):
self.stress0 = uniaxialStress
def fun(self, sigma0, ydata, sigmas):
return HosfordBasis(sigma0, (0.5,0.5,0.5), 2.0, sigmas)
def jac(self, sigma0, ydata, sigmas):
return HosfordBasis(sigma0, (0.5,0.5,0.5), 2.0, sigmas, Jac=True, nParas=1)
class Drucker(object):
'''
residuum of Drucker yield criterion (eq. 2.41, F = sigma0)
'''
def __init__(self, uniaxialStress):
self.stress0 = uniaxialStress
def fun(self, (sigma0, C_D), ydata, sigmas):
return DruckerBasis(sigma0, C_D, 1.0, sigmas)
def jac(self, (sigma0, C_D), ydata, sigmas):
return DruckerBasis(sigma0, C_D, 1.0, sigmas, Jac=True, nParas=2)
class generalDrucker(object):
'''
residuum of general Drucker yield criterion (eq. 2.42, F = sigma0)
'''
def __init__(self, uniaxialStress):
self.stress0 = uniaxialStress
def fun(self, (sigma0, C_D, p), ydata, sigmas):
return DruckerBasis(sigma0, C_D, p, sigmas)
def jac(self, (sigma0, C_D, p), ydata, sigmas):
return DruckerBasis(sigma0, C_D, p, sigmas, Jac=True, nParas=3)
class Hosford(object):
'''
residuum of Hershey yield criterion (eq. 2.43, Y = sigma0)
'''
def __init__(self, uniaxialStress):
self.stress0 = uniaxialStress
def fun(self, (sigma0, a), ydata, sigmas):
return HosfordBasis(sigma0, (0.5,0.5,0.5), a, sigmas)
def jac(self, (sigma0, a), ydata, sigmas):
return HosfordBasis(sigma0, (0.5,0.5,0.5), a, sigmas, Jac=True, nParas=2)
class Hill1948(object):
'''
residuum of Hill 1948 quadratic yield criterion (eq. 2.48) Right
'''
def __init__(self, uniaxialStress):
self.stress0 = uniaxialStress
def fun(self, (F,G,H,L,M,N), ydata, sigmas):
return Hill1948Basis((F,G,H,L,M,N),sigmas)
def jac(self, (F,G,H,L,M,N), ydata, sigmas):
return Hill1948Basis((F,G,H,L,M,N),sigmas, Jac=True)
class Hill1979(object):
'''
residuum of Hill 1979 non-quadratic yield criterion (eq. 2.48)
'''
def __init__(self, uniaxialStress):
self.stress0 = uniaxialStress
def fun(self, (f,g,h,a,b,c,m), ydata, sigmas):
return Hill1979Basis(self.stress0, (f,g,h,a,b,c),m, sigmas)
def jac(self, (f,g,h,a,b,c,m), ydata, sigmas):
return Hill1979Basis(self.stress0, (f,g,h,a,b,c),m, sigmas, Jac=True)
class generalHosford(object):
'''
residuum of Hershey yield criterion (eq. 2.104, sigmas = sigma0)
'''
def __init__(self, uniaxialStress):
self.stress0 = uniaxialStress
def fun(self, (F, G, H, a), ydata, sigmas, nParas=4):
return HosfordBasis(self.stress0, (F, G, H), a, sigmas)
def jac(self, (F, G, H, a), ydata, sigmas):
return HosfordBasis(self.stress0, (F, G, H), a, sigmas, Jac=True, nParas=4)
class Barlat1991iso(object):
'''
residuum of isotropic Barlat 1991 yield criterion (eq. 2.37)
'''
def __init__(self, uniaxialStress):
self.stress0 = uniaxialStress
def fun(self, (sigma0, m), ydata, sigmas):
return Barlat1991Basis(sigma0, np.ones(6), m, sigmas)
def jac(self, (sigma0, m), ydata, sigmas):
return Barlat1991Basis(sigma0, np.ones(6), m, sigmas, Jac=True, nParas=2)
class Barlat1991aniso(object):
''' '''
residuum of anisotropic Barlat 1991 yield criterion (eq. 2.37) residuum of anisotropic Barlat 1991 yield criterion (eq. 2.37)
''' '''
def __init__(self, uniaxialStress): def __init__(self, criterion, uniaxialStress,exponent):
self.stress0 = uniaxialStress self.stress0 = uniaxialStress
def fun(self, (a,b,c,f,g,h, m), ydata, sigmas): if exponent < 0.0:
return Barlat1991Basis(self.stress0, (a,b,c,f,g,h), m, sigmas) self.mFix = [False, exponent]
def jac(self, (a,b,c,f,g,h, m), ydata, sigmas): else:
return Barlat1991Basis(self.stress0, (a,b,c,f,g,h), m, sigmas, Jac=True, nParas=7) self.mFix = [True, exponent]
self.func = fitCriteria[criterion]['func']
self.criteria = criterion
def fun(self, paras, ydata, sigmas):
return self.func(self.stress0, paras, sigmas,self.mFix,self.criteria)
def jac(self, paras, ydata, sigmas):
return self.func(self.stress0, paras, sigmas,self.mFix,self.criteria,Jac=True)
class Yld200418p(object):
'''
residuum of anisotropic Barlat 1991 yield criterion (eq. 2.37)
'''
def __init__(self, uniaxialStress):
self.stress0 = uniaxialStress
def fun(self, (c12,c21,c23,c32,c31,c13,c44,c55,c66,
d12,d21,d23,d32,d31,d13,d44,d55,d66, m), ydata, sigmas):
return Yld200418pBasis(self.stress0, (c12,c21,c23,c32,c31,c13,c44,c55,c66),
(d12,d21,d23,d32,d31,d13,d44,d55,d66), m, sigmas)
def jac(self, (c12,c21,c23,c32,c31,c13,c44,c55,c66,
d12,d21,d23,d32,d31,d13,d44,d55,d66, m), ydata, sigmas):
return Yld200418pBasis(self.stress0, (c12,c21,c23,c32,c31,c13,c44,c55,c66),
(d12,d21,d23,d32,d31,d13,d44,d55,d66), m, sigmas, Jac=True)
class KarafillisBoyce(object):
'''
residuum of Karafillis-Boyce yield criterion
'''
def __init__(self, uniaxialStress):
self.stress0 = uniaxialStress
def fun(self, (c11,c12,c13,c14,c15,c16,c21,c22,c23,c24,c25,c26,
b1, b2, a, alpha), ydata, sigmas):
return KarafillisBoyceBasis(self.stress0, (c11,c12,c13,c14,c15,c16),
(c21,c22,c23,c24,c25,c26), b1, b2, a, alpha, sigmas)
def jac(self, (c11,c12,c13,c14,c15,c16,c21,c22,c23,c24,c25,c26,
b1, b2, a, alpha), ydata, sigmas):
return KarafillisBoyceBasis(self.stress0, (c11,c12,c13,c14,c15,c16),
(c21,c22,c23,c24,c25,c26), b1, b2, a, alpha, sigmas, Jac=True)
class BBC2003(object):
'''
residuum of anisotropic Barlat 1991 yield criterion (eq. 2.37)
'''
def __init__(self, uniaxialStress):
self.stress0 = uniaxialStress
def fun(self, (a,b,c, d,e,f,g, k), ydata, sigmas):
return BBC2003Basis(self.stress0, a,b,c, d,e,f,g, k, sigmas)
def jac(self, (a,b,c, d,e,f,g, k), ydata, sigmas):
return BBC2003Basis(self.stress0, a,b,c, d,e,f,g, k, sigmas, Jac=True)
class BBC2005(object):
'''
residuum of anisotropic Barlat 1991 yield criterion (eq. 2.37)
'''
def __init__(self, uniaxialStress):
self.stress0 = uniaxialStress
def fun(self, (a,b,L, M, N, P, Q, R, k), ydata, sigmas):
return BBC2005Basis(self.stress0, a,b,L, M, N, P, Q, R, k, sigmas)
def jac(self, (a,b,L, M, N, P, Q, R, k), ydata, sigmas):
return BBC2005Basis(self.stress0, a,b,L, M, N, P, Q, R, k, sigmas, Jac=True)
class Cazacu_Barlat2D(object):
'''
'''
def __init__(self, uniaxialStress):
self.stress0 = uniaxialStress
def fun(self, (a1,a2,a3,a4,b1,b2,b3,b4,b5,b10,c), ydata, sigmas):
return Cazacu_BarlatBasis(self.stress0, (a1,a2,a3,a4),
(b1,b2,b3,b4,b5,b10),c,sigmas, nDim = 2)
def jac(self, (a1,a2,a3,a4,b1,b2,b3,b4,b5,b10,c), ydata, sigmas):
return Cazacu_BarlatBasis(self.stress0, (a1,a2,a3,a4),
(b1,b2,b3,b4,b5,b10),c,sigmas,Jac=True, nDim = 2)
class Cazacu_Barlat3D(object):
'''
'''
def __init__(self, uniaxialStress):
self.stress0 = uniaxialStress
def fun(self, (a1,a2,a3,a4,a5,a6,b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,c),ydata, sigmas):
return Cazacu_BarlatBasis(self.stress0, (a1,a2,a3,a4,a5,a6),
(b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11),c,sigmas)
def jac(self, (a1,a2,a3,a4,a5,a6,b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,c),ydata, sigmas):
return Cazacu_BarlatBasis(self.stress0, (a1,a2,a3,a4,a5,a6),
(b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11),c,sigmas,Jac=True)
class Vegter(object): class Vegter(object):
''' '''
Vegter yield criterion Vegter yield criterion
@ -349,12 +233,35 @@ def VetgerCriterion(stress,lankford, rhoBi0, theta=0.0):
vegter = Vegter(refPts, refNormals) vegter = Vegter(refPts, refNormals)
def Cazacu_BarlatBasis(sigma0,coeffa,coeffb,c,sigmas, Jac = False, nDim = 3): def Tresca(eqStress, paras, sigmas, mFix, criteria, Jac = False):
''' '''
residuum of the 3D Cazacu–Barlat (CB) yield criterion Tresca yield criterion
the fitted parameters is: paras(sigma0)
''' '''
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
if not Jac:
return r.ravel()
else:
return -np.ones(len(r))
def Cazacu_Barlat(eqStress, paras, sigmas, mFix, criteria, 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
'''
if criteria == 'cb2d':
coeffa, coeffb, c = paras[0:4],paras[4:10],paras[10]
else:
coeffa, coeffb, c = paras[0:6],paras[6:17],paras[17]
s11,s22,s33,s12,s23,s31 = sigmas s11,s22,s33,s12,s23,s31 = sigmas
if nDim == 2: s33=s23=s31 = np.zeros_like(s11) if criteria == 'cb2d': s33=s23=s31 = np.zeros_like(s11)
s1_2, s2_2, s3_2, s12_2, s23_2, s31_2 = np.array([s11,s22,s33,s12,s23,s31])**2 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 s1_3, s2_3, s3_3, s123, s321 = s11*s1_2, s22*s2_2, s33*s3_2,s11*s22*s33, s12*s23*s31
d12,d23,d31 = s11-s22, s22-s33, s33-s11 d12,d23,d31 = s11-s22, s22-s33, s33-s11
@ -369,7 +276,7 @@ def Cazacu_BarlatBasis(sigma0,coeffa,coeffb,c,sigmas, Jac = False, nDim = 3):
jb8, jb9 = d31*s31_2/3.0, d12*s31_2/1.5 jb8, jb9 = d31*s31_2/3.0, d12*s31_2/1.5
jb11 = s321*2.0 jb11 = s321*2.0
if nDim == 3: if criteria == 'cb3d':
dJ2da = np.array([d12**2/6.0, d23**2/6.0, d31**2/6.0, s12_2,s23_2,s31_2]) dJ2da = np.array([d12**2/6.0, d23**2/6.0, d31**2/6.0, s12_2,s23_2,s31_2])
dJ3db = np.array([jb1,jb2,jb3,jb4,jb5,jb6,jb7,jb8,jb9,jb10,jb11]) dJ3db = np.array([jb1,jb2,jb3,jb4,jb5,jb6,jb7,jb8,jb9,jb10,jb11])
else: # plane stress else: # plane stress
@ -379,7 +286,7 @@ def Cazacu_BarlatBasis(sigma0,coeffa,coeffb,c,sigmas, Jac = False, nDim = 3):
J20 = np.dot(coeffa,dJ2da) J20 = np.dot(coeffa,dJ2da)
J30 = np.dot(coeffb,dJ3db) J30 = np.dot(coeffb,dJ3db)
f0 = (J20**3 - c*J30**2)/18.0 f0 = (J20**3 - c*J30**2)/18.0
r = f0**(1.0/6.0)*(3.0/sigma0) r = f0**(1.0/6.0)*(3.0/eqStress)
if not Jac: if not Jac:
return (r - 1.0).ravel() return (r - 1.0).ravel()
@ -387,11 +294,26 @@ def Cazacu_BarlatBasis(sigma0,coeffa,coeffb,c,sigmas, Jac = False, nDim = 3):
df = r/f0/108.0 df = r/f0/108.0
return np.vstack((df*3.0*J20**2.0*dJ2da, -df*2.0*J30*c*dJ3db, -df*J30**2)).T return np.vstack((df*3.0*J20**2.0*dJ2da, -df*2.0*J30*c*dJ3db, -df*J30**2)).T
def DruckerBasis(sigma0, C_D, p, sigmas, Jac=False, nParas=2): def Drucker(eqStress, paras, sigmas, mFix, criteria, 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) I1,I2,I3 = invariant(sigmas)
J2 = I1**2/3.0 - I2 J2 = I1**2/3.0 - I2
J3 = I1**3/13.5 - I1*I2/3.0 + I3 J3 = I1**3/13.5 - I1*I2/3.0 + I3
J2_3p = J2**(3.0*p); J3_2p = J3**(2.0*p) J2_3p = J2**(3.0*p)
J3_2p = J3**(2.0*p)
left = J2_3p - C_D*J3_2p left = J2_3p - C_D*J3_2p
r = left**(1.0/(6.0*p))*3.0**0.5/sigma0 r = left**(1.0/(6.0*p))*3.0**0.5/sigma0
@ -399,27 +321,42 @@ def DruckerBasis(sigma0, C_D, p, sigmas, Jac=False, nParas=2):
return (r - 1.0).ravel() return (r - 1.0).ravel()
else: else:
drdl = r/left/(6.0*p) drdl = r/left/(6.0*p)
if nParas == 2: if criteria == 'drucker':
return np.vstack((-r/sigma0, -drdl*J3_2p)).T return np.vstack((-r/sigma0, -drdl*J3_2p)).T
else: else:
dldp = 3.0*J2_3p*math_ln(J2) - 2.0*C_D*J3_2p*math_ln(J3) 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) jp = drdl*dldp + r*math_ln(left)/(-6.0*p*p)
return np.vstack((-r/sigma0, -drdl*J3_2p, jp)).T
def Hill1948Basis(coeff, sigmas, Jac=False): 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, Jac = False):
'''
Hill 1948 yield criterion
the fitted parameters are F, G, H, L, M, N
eqStress, criteria are invalid input
'''
s11,s22,s33,s12,s23,s31 = sigmas s11,s22,s33,s12,s23,s31 = sigmas
jac = np.array([(s22-s33)**2,(s33-s11)**2,(s11-s22)**2, 2.0*s23**2,2.0*s31**2,2.0*s12**2]) 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: if not Jac:
return (np.dot(coeff,jac)/2.0-0.5).ravel() return (np.dot(paras,jac)/2.0-0.5).ravel()
else: else:
return jac.T return jac.T
def Hill1979Basis(sigma0, coeff,m, sigmas, Jac=False): def Hill1979(eqStress,paras, sigmas, mFix, criteria, Jac = False):
'''
Hill 1979 yield criterion
the fitted parameters are: f,g,h,a,b,c,m
'''
if mFix[0]: m = mFix[1]
else: m = paras[-1]
coeff = paras[0:6]
s1,s2,s3 = principalStresses(sigmas) s1,s2,s3 = 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([s2-s3, s3-s1, s1-s2, 2.0*s1-s2-s3, 2.0*s2-s3-s1, 2.0*s3-s1-s2])**2
diffsm = diffs**(m/2.0) diffsm = diffs**(m/2.0)
base = np.dot(coeff,diffsm) base = np.dot(coeff,diffsm)
r = base**(1.0/m)/sigma0 #left = base**mi r = base**(1.0/m)/eqStress #left = base**mi
if not Jac: if not Jac:
return (r-1.0).ravel() return (r-1.0).ravel()
@ -427,35 +364,73 @@ def Hill1979Basis(sigma0, coeff,m, sigmas, Jac=False):
drdb = r/base/m drdb = r/base/m
dbdm = np.dot(coeff,diffsm*math_ln(diffs)) #****0.5 dbdm = np.dot(coeff,diffsm*math_ln(diffs)) #****0.5
jm = drdb*dbdm + r*math_ln(base)/(-m**2) jm = drdb*dbdm + r*math_ln(base)/(-m**2)
return np.vstack((drdb*diffsm, jm)).T
def HosfordBasis(sigma0, coeff, a, sigmas, Jac=False, nParas=1): if mFix[0]: return np.vstack((drdb*diffsm)).T
else: return np.vstack((drdb*diffsm, jm)).T
def Hosford(eqStress, paras, sigmas, mFix, criteria, Jac = False):
''' '''
residuum of Hershey yield criterion (eq. 2.43, Y = sigma0) 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':
coeff = np.ones(3)
a = 2.0
sigma0 = paras
elif criteria == 'hershey':
sigma0 = paras[0]
if mFix[0]: a = mFix[1]
else: a = paras[1]
coeff = np.ones(3)
else:
print '11'
coeff = paras[0:3]
if mFix[0]: a = mFix[1]
else: a = paras[3]
s1,s2,s3 = principalStresses(sigmas) s1,s2,s3 = principalStresses(sigmas)
diffs = np.abs(np.array([s2-s3, s3-s1, s1-s2])) diffs = np.abs(np.array([s2-s3, s3-s1, s1-s2]))
diffsm = diffs**a diffsm = diffs**a
base = np.dot(coeff,diffsm) base = np.dot(coeff,diffsm)
r = base**(1.0/a)/sigma0 expo = 1.0/a
r = (base/2.0)**expo/sigma0
if not Jac: if not Jac:
return (r - 1.0).ravel() return (r-1.0).ravel()
else: else:
if nParas == 1: # von Mises if criteria == 'vonmises': # von Mises
return -r/sigma0 return -r/sigma0
else: else:
dbda = np.dot(coeff,diffsm*math_ln(diffs)) dbda = np.dot(coeff,diffsm*math_ln(diffs))
dldb = r/base/a drdb = r/base*expo
ja = dldb*dbda + r*math_ln(base)/(-a**a) ja = drdb*dbda + r*math_ln(base/2.0)*(-expo*expo)
if nParas == 2: # isotropic Hosford if criteria == 'hershey': # Hershey
return np.vstack((-r/sigma0, ja)).T if mFix[0]: return -r/sigma0
else: # anisotropic Hosford else: return np.vstack((-r/sigma0, ja)).T
return np.vstack((dldb*diffsm, ja)).T else: # Anisotropic Hosford
if mFix[0]: return np.vstack((drdb*diffsm)).T
else: return np.vstack((drdb*diffsm, ja)).T
def Barlat1991Basis(sigma0, coeff, m, sigmas, Jac=False, nParas=2): def Barlat1991(eqStress, paras, sigmas, mFix, criteria, Jac=False):
''' '''
residuum of Barlat 1997 yield criterion Barlat 1991 criteria
the fitted parameters are:
Isotropic: sigma0, m
Anisotropic: a, b, c, f, g, h, m
''' '''
if criteria == 'barlat1991iso':
sigma0 = paras[0]
coeff = np.ones(6)
else:
sigma0 = eqStress
coeff = paras[0:6]
if mFix[0]:m = mFix[1]
else: m = paras[-1]
cos = np.cos; sin = np.sin; pi = np.pi; abs = np.abs cos = np.cos; sin = np.sin; pi = np.pi; abs = np.abs
s1,s2,s3,s4,s5,s6 = sigmas s1,s2,s3,s4,s5,s6 = sigmas
dXdx = np.array([s2-s3,s3-s1,s1-s2,s5,s6,s4]) dXdx = np.array([s2-s3,s3-s1,s1-s2,s5,s6,s4])
@ -475,9 +450,10 @@ def Barlat1991Basis(sigma0, coeff, m, sigmas, Jac=False, nParas=2):
dfdl = r/left/m dfdl = r/left/m
jm = r*math_ln(left)/(-m**2) + dfdl*0.5*( jm = r*math_ln(left)/(-m**2) + dfdl*0.5*(
absc1**m*math_ln(absc1) + absc2**m*math_ln(absc2) + absc3**m*math_ln(absc3) ) absc1**m*math_ln(absc1) + absc2**m*math_ln(absc2) + absc3**m*math_ln(absc3) )
if nParas == 2: if criteria == 'barlat1991iso':
js = -(r + 1.0)/sigma0 js = -(r + 1.0)/sigma0
return np.vstack((js,jm)).T if mFix[0]: return js
else: return np.vstack((js,jm)).T
else: else:
da,db,dc = (2.0*A-B-C)/18.0, (2.0*B-C-A)/18.0, (2.0*C-A-B)/18.0 da,db,dc = (2.0*A-B-C)/18.0, (2.0*B-C-A)/18.0, (2.0*C-A-B)/18.0
dI2dx = np.array([da, db, dc, F,G,H])/1.5*dXdx dI2dx = np.array([da, db, dc, F,G,H])/1.5*dXdx
@ -489,12 +465,18 @@ def Barlat1991Basis(sigma0, coeff, m, sigmas, Jac=False, nParas=2):
dfdcos = lambda phi : dfdc*(2.0*abs(cos(phi)))**(1.0/m-1.0)*np.sign(cos(phi))*(-sin(phi)/1.5) 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)) dfdthe= (dfdcos(phi1) + dfdcos(phi2) + dfdcos(phi3))
dfdI2 = dfdthe*darccos*I3*(-1.5)*I2**(-2.5); dfdI3 = dfdthe*darccos*I2**(-1.5) dfdI2 = dfdthe*darccos*I3*(-1.5)*I2**(-2.5); dfdI3 = dfdthe*darccos*I2**(-1.5)
return np.vstack((dfdI2*dI2dx + dfdI3*dI3dx, jm)).T
def BBC2003Basis(sigma0, a,b,c, d,e,f,g, k, sigmas, Jac=False): if mFix[0]: return np.vstack((dfdI2*dI2dx+dfdI3*dI3dx)).T
else: return np.vstack((dfdI2*dI2dx+dfdI3*dI3dx, jm)).T
def BBC2003(eqStress, paras, sigmas, mFix, criteria, Jac=False):
''' '''
residuum of the BBC2003 yield criterion for plain stress residuum of the BBC2003 yield criterion for plain stress
''' '''
a,b,c, d,e,f,g= paras[0:7]
if mFix[0]: k = mFix[1]
else: k = paras[-1]
s11 = sigmas[0]; s22 = sigmas[1]; s12 = sigmas[3] s11 = sigmas[0]; s22 = sigmas[1]; s12 = sigmas[3]
k2 = 2.0*k k2 = 2.0*k
M = d+e; N = e+f; P = (d-e)/2.0; Q = (e-f)/2.0; R = g**2 M = d+e; N = e+f; P = (d-e)/2.0; Q = (e-f)/2.0; R = g**2
@ -506,18 +488,16 @@ def BBC2003Basis(sigma0, a,b,c, d,e,f,g, k, sigmas, Jac=False):
l3 = 2.0*c*Psi; l3s = l3**2 l3 = 2.0*c*Psi; l3s = l3**2
left = a*l1s**k + a*l2s**k + (1-a)*l3s**k left = a*l1s**k + a*l2s**k + (1-a)*l3s**k
sBar = left**(1.0/k2); r = sBar/sigma0 - 1.0 sBar = left**(1.0/k2); r = sBar/eqStress - 1.0
if not Jac: if not Jac:
return r.ravel() return r.ravel()
else: else:
temp = (P*s11 + Q*s22)/Psi temp = (P*s11 + Q*s22)/Psi
dPsidP = temp*s11; dPsidQ = temp*s22; dPsidR = 0.5*s12**2/Psi dPsidP = temp*s11; dPsidQ = temp*s22; dPsidR = 0.5*s12**2/Psi
ln = lambda x : np.log(x + 1.0e-32)
expo = 0.5/k; k1 = k-1.0 expo = 0.5/k; k1 = k-1.0
dsBardl = expo*sBar/left/sigma0 dsBardl = expo*sBar/left/eqStress
dsBarde = sBar*ln(left); dedk = expo/(-k) dsBarde = sBar*math_ln(left); dedk = expo/(-k)
dldl1 = a *k*(l1s**k1)*(2.0*l1) dldl1 = a *k*(l1s**k1)*(2.0*l1)
dldl2 = a *k*(l2s**k1)*(2.0*l2) dldl2 = a *k*(l2s**k1)*(2.0*l2)
dldl3 = (1-a)*k*(l3s**k1)*(2.0*l3) dldl3 = (1-a)*k*(l3s**k1)*(2.0*l3)
@ -528,7 +508,7 @@ def BBC2003Basis(sigma0, a,b,c, d,e,f,g, k, sigmas, Jac=False):
dlda = l1s**k + l2s**k - l3s**k dlda = l1s**k + l2s**k - l3s**k
dldb = dldl1*Gamma + dldl2*Gamma dldb = dldl1*Gamma + dldl2*Gamma
dldc = dldl1*Psi - dldl2*Psi + dldl3*2.0*Psi dldc = dldl1*Psi - dldl2*Psi + dldl3*2.0*Psi
dldk = a*ln(l1s)*l1s**k + a*ln(l2s)*l2s**k + (1-a)*ln(l3s)*l3s**k dldk = a*math_ln(l1s)*l1s**k + a*math_ln(l2s)*l2s**k + (1-a)*math_ln(l3s)*l3s**k
ja = dsBardl * dlda ja = dsBardl * dlda
jb = dsBardl * dldb jb = dsBardl * dldb
@ -538,12 +518,18 @@ def BBC2003Basis(sigma0, a,b,c, d,e,f,g, k, sigmas, Jac=False):
jf = dsBardl *(dldGama*s22 + dldPsi*dPsidQ*(-0.5)) jf = dsBardl *(dldGama*s22 + dldPsi*dPsidQ*(-0.5))
jg = dsBardl * dldPsi * dPsidR * 2.0*g jg = dsBardl * dldPsi * dPsidR * 2.0*g
jk = dsBardl * dldk + dsBarde * dedk jk = dsBardl * dldk + dsBarde * dedk
return np.vstack((ja,jb,jc,jd, je, jf,jg,jk)).T
def BBC2005Basis(sigma0, a,b,L, M, N, P, Q, R, k, sigmas, Jac=False): if mFix[0]: return np.vstack((ja,jb,jc,jd, je, jf,jg)).T
else: return np.vstack((ja,jb,jc,jd, je, jf,jg,jk)).T
def BBC2005(eqStress, paras, sigmas, mFix, criteria, Jac=False):
''' '''
residuum of the BBC2005 yield criterion for plain stress residuum of the BBC2005 yield criterion for plain stress
''' '''
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] s11 = sigmas[0]; s22 = sigmas[1]; s12 = sigmas[3]
k2 = 2.0*k k2 = 2.0*k
Gamma = L*s11 + M*s22 Gamma = L*s11 + M*s22
@ -553,14 +539,14 @@ def BBC2005Basis(sigma0, a,b,L, M, N, P, Q, R, k, sigmas, Jac=False):
l1 = Lambda + Gamma; l2 = Lambda - Gamma; l3 = Lambda + Psi; l4 = Lambda - Psi l1 = Lambda + Gamma; l2 = Lambda - Gamma; l3 = Lambda + Psi; l4 = Lambda - Psi
l1s = l1**2; l2s = l2**2; l3s = l3**2; l4s = l4**2 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 left = a*l1s**k + a*l2s**k + b*l3s**k + b*l4s**k
sBar = left**(1.0/k2); r = sBar/sigma0 - 1.0 sBar = left**(1.0/k2); r = sBar/eqStress - 1.0
if not Jac: if not Jac:
return r.ravel() return r.ravel()
else: else:
ln = lambda x : np.log(x + 1.0e-32) ln = lambda x : np.log(x + 1.0e-32)
expo = 0.5/k; k1 = k-1.0 expo = 0.5/k; k1 = k-1.0
dsBardl = expo*sBar/left/sigma0 dsBardl = expo*sBar/left/eqStress
dsBarde = sBar*ln(left); dedk = expo/(-k) dsBarde = sBar*ln(left); dedk = expo/(-k)
dldl1 = a*k*(l1s**k1)*(2.0*l1) dldl1 = a*k*(l1s**k1)*(2.0*l1)
dldl2 = a*k*(l2s**k1)*(2.0*l2) dldl2 = a*k*(l2s**k1)*(2.0*l2)
@ -578,70 +564,20 @@ def BBC2005Basis(sigma0, a,b,L, M, N, P, Q, R, k, sigmas, Jac=False):
J = dsBardl * np.array( [ J = dsBardl * np.array( [
l1s**k+l2s**k, l3s**k+l4s**k,dldGama*s11,dldGama*s22,dldLambda*dLambdadN, l1s**k+l2s**k, l3s**k+l4s**k,dldGama*s11,dldGama*s22,dldLambda*dLambdadN,
dldLambda*dLambdadP, dldPsi*dPsidQ, dldPsi*dPsidR, dldk+dsBarde*dedk ]) dldLambda*dLambdadP, dldPsi*dPsidQ, dldPsi*dPsidR])
return np.vstack(J).T
def principalStress(p): if mFix[0]: return np.vstack(J).T
sin = np.sin; cos = np.cos else : return np.vstack(J, dldk+dsBarde*dedk).T
I1,I2,I3 = invariant(p)
third = 1.0/3.0 def Yld200418p(eqStress, paras, sigmas, mFix, criteria, Jac=False):
I1s3I2= (I1**2 - 3.0*I2)**0.5
numer = 2.0*I1**3 - 9.0*I1*I2 + 27.0*I3
denom = I1s3I2**(-3.0)
cs = 0.5*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), Karafillis=False):
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 = I1s3I2**(-3.0)
cs = 0.5*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 = 0.5*(6.0*I1**2 - 9.0*I2)*denom + dcsddenom*(2.0*I1)
dcsdI2 = 0.5*( - 9.0*I1)*denom + dcsddenom*(-3.0)
dcsdI3 = 13.5*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); dim = 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(dim)]).T
return np.concatenate((np.array([np.dot(dSdp[:,0:3,i], dpdc[:,:,i].T).T/3.0 for i in xrange(dim)]).T,
np.vstack([dSdp[:,3]*s4,dSdp[:,4]*s5,dSdp[:,5]*s6]).T.reshape(dim,3,3).T), axis=1)
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(dim)]).T
def Yld200418pBasis(sigma0, C, D, m, sigmas, Jac=False):
''' '''
C: c12,c21,c23,c32,c13,c31,c44,c55,c66 C: c12,c21,c23,c32,c13,c31,c44,c55,c66
D: d12,d21,d23,d32,d31,d13,d44,d55,d66 D: d12,d21,d23,d32,d31,d13,d44,d55,d66
''' '''
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 sv = (sigmas[0] + sigmas[1] + sigmas[2])/3.0
sdev = np.vstack((sigmas[0:3]-sv,sigmas[3:6])) 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], ys = lambda sdev, C: np.array([-C[0]*sdev[1]-C[5]*sdev[2], -C[1]*sdev[0]-C[2]*sdev[2],
@ -654,27 +590,34 @@ def Yld200418pBasis(sigma0, C, D, m, sigmas, Jac=False):
QiPj = np.array([(qLambdas[i,:]-pLambdas[j,:]) for i in x3 for j in x3]).reshape(3,3,dim) QiPj = np.array([(qLambdas[i,:]-pLambdas[j,:]) for i in x3 for j in x3]).reshape(3,3,dim)
PiQjs = PiQj**2 PiQjs = PiQj**2
phi = np.sum(PiQjs**m2,axis=0) phi = np.sum(PiQjs**m2,axis=0)
r = (0.25*phi)**m1/sigma0 - 1.0 r = (0.25*phi)**m1/eqStress
if not Jac: if not Jac:
return r.ravel() return (r - 1.0).ravel()
else: else:
drdphi = (r+1.0)*m1/phi drdphi = r*m1/phi*4.0
dphidm = np.sum(PiQjs**m2*math_ln(PiQjs),axis=0)*0.5 dphidm = np.sum(PiQjs**m2*math_ln(PiQjs),axis=0)*0.5
dPdc, dQdd = principalStrs_Der(p, sdev), principalStrs_Der(q, sdev) dPdc, dQdd = principalStrs_Der(p, sdev), principalStrs_Der(q, sdev)
PiQjs3d = (PiQjs**m21).reshape(3,3,dim) PiQjs3d = (PiQjs**m21).reshape(3,3,dim)
dphidP = -m*np.array([np.diag(np.dot(PiQjs3d[:,:,i], QiPj [:,:,i])) for i in xrange(dim)]).T dphidP = -m*np.array([np.diag(np.dot(PiQjs3d[:,:,i], QiPj [:,:,i])) for i in xrange(dim)]).T
dphidQ = m*np.array([np.diag(np.dot(QiPj [:,:,i], PiQjs3d[:,:,i])) for i in xrange(dim)]).T dphidQ = m*np.array([np.diag(np.dot(QiPj [:,:,i], PiQjs3d[:,:,i])) for i in xrange(dim)]).T
jm = drdphi*dphidm + (r+1.0)*math_ln(0.25*phi)*(-m1*m1) jm = drdphi*dphidm + r*math_ln(0.25*phi)*(-m1*m1)
jc = drdphi*np.sum([dphidP[i]*dPdc[i] for i in x3],axis=0) jc = drdphi*np.sum([dphidP[i]*dPdc[i] for i in x3],axis=0)
jd = drdphi*np.sum([dphidQ[i]*dQdd[i] for i in x3],axis=0) jd = drdphi*np.sum([dphidQ[i]*dQdd[i] for i in x3],axis=0)
return np.vstack((jc,jd, jm)).T
def KarafillisBoyceBasis(sigma0, C1,C2, b1, b2, a, alpha , sigmas, Jac=False): if mFix[0]: return np.vstack((jc,jd)).T
else: return np.vstack((jc,jd,jm)).T
def KarafillisBoyce(eqStress, paras, sigmas, mFix, criteria, Jac=False):
ks = lambda (s1,s2,s3,s4,s5,s6),(c1,c2,c3,c4,c5,c6): np.array( [ 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, ((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 ]) ((c1+c2)*s3-c2*s1-c1*s2)/3.0, c4*s4, c5*s5, c6*s6 ])
C1,C2,alpha = paras[0:6], paras[6:12], paras[12]
if mFix[0]: b1=b2=a = mFix[1]
else: b1,b2,a = paras[12:15]
print b1,b2,a
p,q = ks(sigmas, C1), ks(sigmas, C2) p,q = ks(sigmas, C1), ks(sigmas, C2)
plambdas,qlambdas = principalStress(p), principalStress(q) 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) b1i,b2i,ai,rb2 = 1.0/b1, 1.0/b2, 1.0/a, 3.0**b2/(2.0**b2+2.0)
@ -686,7 +629,7 @@ def KarafillisBoyceBasis(sigma0, C1,C2, b1, b2, a, alpha , sigmas, Jac=False):
phi10, phi20 = np.sum(difPs**(b1/2.0),axis = 0), np.sum(Qs**(b2/2.0),axis = 0) 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 phi1, phi2 = (0.5*phi10)**b1i, (rb2*phi20)**b2i
Stress = alpha*phi1**a + (1.0-alpha)*phi2**a Stress = alpha*phi1**a + (1.0-alpha)*phi2**a
r = Stress**ai/sigma0 r = Stress**ai/eqStress
if not Jac: if not Jac:
return (r-1.0).ravel() return (r-1.0).ravel()
@ -711,135 +654,133 @@ def KarafillisBoyceBasis(sigma0, C1,C2, b1, b2, a, alpha , sigmas, Jac=False):
jc1 = np.sum([dphi1dP[i]*dPdc[i] for i in xrange(3)],axis=0)*drds*a*phi1**(a-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) 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) jalpha = drds * (phi1**a - phi2**a)
return np.vstack((jc1,jc2,jb1,jb2,ja,jalpha)).T
if mFix[0]: return np.vstack((jc1,jc2,jalpha)).T
else: return np.vstack((jc1,jc2,jalpha,jb1,jb2,ja)).T
fittingCriteria = { fitCriteria = {
'tresca' :{'func' : Tresca, 'tresca' :{'func' : Tresca,
'num' : 1, 'nExpo': 0,'err':np.inf,
'name' : 'Tresca', 'bound': [(None,None)],
'paras': 'Initial yield stress:', 'paras': 'Initial yield stress:',
'text' : '\nCoefficient of Tresca criterion:\nsigma0: ', 'text' : '\nCoefficient of Tresca criterion:\nsigma0: ',
'error': 'The standard deviation error is: ' 'error': 'The standard deviation error is: '
}, },
'vonmises' :{'func' : vonMises, 'vonmises' :{'func' : Hosford,
'num' : 1, 'nExpo': 0,'err':np.inf,
'name' : 'Huber-Mises-Hencky(von Mises)', 'bound': [(None,None)],
'paras': 'Initial yield stress:', 'paras': 'Initial yield stress:',
'text' : '\nCoefficient of Huber-Mises-Hencky criterion:\nsigma0: ', 'text' : '\nCoefficient of Huber-Mises-Hencky criterion:\nsigma0: ',
'error': 'The standard deviation error is: ' 'error': 'The standard deviation error is: '
}, },
'hosfordiso' :{'func' : Hosford, 'hershey' :{'func' : Hosford,
'num' : 2, 'nExpo': 1,'err':np.inf,
'name' : 'Gerenal isotropic Hosford', 'bound': [(None,None)]+[(2.0,8.0)],
'paras': 'Initial yield stress, a:', 'paras': 'Initial yield stress, a:',
'text' : '\nCoefficients of Hosford criterion:\nsigma0, a: ', 'text' : '\nCoefficients of Hershey criterion:\nsigma0, a: ',
'error': 'The standard deviation errors are: ' 'error': 'The standard deviation errors are: '
}, },
'hosfordaniso' :{'func' : generalHosford, 'ghosford' :{'func' : Hosford,
'num' : 5, 'nExpo': 1,'err':np.inf,
'name' : 'Gerenal isotropic Hosford', 'bound': [(0.0,2.0)]*3+[(0.0,12.0)],
'paras': 'Initial yield stress, F, G, H, a:', 'paras': 'F, G, H, a:',
'text' : '\nCoefficients of Hosford criterion:\nsigma0, F, G, H, a: ', 'text' : '\nCoefficients of Hosford criterion:F, G, H, a: ',
'error': 'The standard deviation errors are: ' 'error': 'The standard deviation errors are: '
}, },
'hill1948' :{'func' : Hill1948, 'hill1948' :{'func' : Hill1948,
'num' : 6, 'nExpo': 0,'err':np.inf,
'name' : 'Hill1948', 'bound': [(None,None)]*6,
'paras': 'Normalized [F, G, H, L, M, N]:', 'paras': 'Normalized [F, G, H, L, M, N]:',
'text' : '\nCoefficients of Hill1948 criterion:\n[F, G, H, L, M, N]:'+' '*16, 'text' : '\nCoefficients of Hill1948 criterion:\n[F, G, H, L, M, N]:'+' '*16,
'error': 'The standard deviation errors are: ' 'error': 'The standard deviation errors are: '
}, },
'hill1979' :{'func' : Hill1979, 'hill1979' :{'func' : Hill1979,
'num' : 7, 'nExpo': 1,'err':np.inf,
'name' : 'Hill1979', 'bound': [(-2.0,2.0)]*6+[(1.0,8.0)],
'paras': 'f,g,h,a,b,c,m:', 'paras': 'f,g,h,a,b,c,m:',
'text' : '\nCoefficients of Hill1979 criterion:\n f,g,h,a,b,c,m:\n', 'text' : '\nCoefficients of Hill1979 criterion:\n f,g,h,a,b,c,m:\n',
'error': 'The standard deviation errors are: ' 'error': 'The standard deviation errors are: '
}, },
'drucker' :{'func' : Drucker, 'drucker' :{'func' : Drucker,
'num' : 2, 'nExpo': 0,'err':np.inf,
'name' : 'Drucker', 'bound': [(None,None)]*2,
'paras': 'Initial yield stress, C_D:', 'paras': 'Initial yield stress, C_D:',
'text' : '\nCoefficients of Drucker criterion:\nsigma0, C_D: ', 'text' : '\nCoefficients of Drucker criterion:\nsigma0, C_D: ',
'error': 'The standard deviation errors are: ' 'error': 'The standard deviation errors are: '
}, },
'gdrucker' :{'func' : generalDrucker, 'gdrucker' :{'func' : Drucker,
'num' : 3, 'nExpo': 1,'err':np.inf,
'name' : 'General Drucker', 'bound': [(None,None)]*2+[(0.0,6.0)],
'paras': 'Initial yield stress, C_D, p:', 'paras': 'Initial yield stress, C_D, p:',
'text' : '\nCoefficients of Drucker criterion:\nsigma0, C_D, p: ', 'text' : '\nCoefficients of general Drucker criterion:\nsigma0, C_D, p: ',
'error': 'The standard deviation errors are: ' 'error': 'The standard deviation errors are: '
}, },
'barlat1991iso' :{'func' : Barlat1991iso, 'barlat1991iso' :{'func' : Barlat1991,
'num' : 2, 'nExpo': 1,'err':np.inf,
'name' : 'Barlat1991iso', 'bound': [(None,None)]+[(0.0,12.0)],
'paras': 'Initial yield stress, m:', 'paras': 'Initial yield stress, m:',
'text' : '\nCoefficients of isotropic Barlat 1991 criterion:\nsigma0, m:\n', 'text' : '\nCoefficients of isotropic Barlat 1991 criterion:\nsigma0, m:\n',
'error': 'The standard deviation errors are: ' 'error': 'The standard deviation errors are: '
}, },
'barlat1991aniso':{'func' : Barlat1991aniso, 'barlat1991aniso':{'func' : Barlat1991,
'num' : 8, 'nExpo': 1,'err':np.inf,
'name' : 'Barlat1991aniso', 'name' : 'Barlat1991',
'paras': 'Initial yield stress, a, b, c, f, g, h, m:', 'bound': [(None,None)]*6+[(0.0,12.0)],
'text' : '\nCoefficients of anisotropic Barlat 1991 criterion:\nsigma0, a, b, c, f, g, h, m:\n', 'text' : '\nCoefficients of anisotropic Barlat 1991 criterion: a, b, c, f, g, h, m:\n',
'error': 'The standard deviation errors are: ' 'error': 'The standard deviation errors are: '
}, },
'bbc2003' :{'func' : BBC2003, 'bbc2003' :{'func' : BBC2003,
'num' : 9, 'nExpo': 1,'err':np.inf,
'name' : 'Banabic-Balan-Comsa 2003', 'bound': [(None,None)]*7+[(1.0,8.0)],
'paras': 'Initial yield stress, a, b, c, d, e, f, g, k:', 'paras': 'a, b, c, d, e, f, g, k:',
'text' : '\nCoefficients of anisotropic Barlat 1991 criterion:\nsigma0, a, b, c, d, e, f, g, k:\n', 'text' : '\nCoefficients of Banabic-Balan-Comsa 2003 criterion: a, b, c, d, e, f, g, k:\n',
'error': 'The standard deviation errors are: ' 'error': 'The standard deviation errors are: '
}, },
'bbc2005' :{'func' : BBC2005, 'bbc2005' :{'func' : BBC2005,
'num' : 9,'err':np.inf, 'nExpo': 1,'err':np.inf,
'name' : 'Banabic-Balan-Comsa 2003', 'bound': [(None,None)]*8+[(0.0,12.0)],
'paras': 'a, b, L ,M, N, P, Q, R, k:', 'paras': 'a, b, L ,M, N, P, Q, R, k:',
'text' : '\nCoefficients of Banabic-Balan-Comsa 2005 criterion: a, b, L ,M, N, P, Q, R, k:\n', 'text' : '\nCoefficients of Banabic-Balan-Comsa 2005 criterion: a, b, L ,M, N, P, Q, R, k:\n',
'error': 'The standard deviation errors are: ' 'error': 'The standard deviation errors are: '
}, },
'Cazacu_Barlat2D':{'func' : Cazacu_Barlat2D, 'cb2d' :{'func' : Cazacu_Barlat,
'num' : 11, 'nExpo': 0,'err':np.inf,
'name' : 'Cazacu Barlat for plain stress', 'bound': [(None,None)]*11,
'paras': 'a1,a2,a3,a6; b1,b2,b3,b4,b5,b10; c:', 'paras': 'a1,a2,a3,a6; b1,b2,b3,b4,b5,b10; c:',
'text' : '\nCoefficients of Cazacu Barlat yield criterion for plane stress: \ 'text' : '\nCoefficients of Cazacu Barlat yield criterion for plane stress: \
\n a1,a2,a3,a6; b1,b2,b3,b4,b5,b10; c:\n', \n a1,a2,a3,a6; b1,b2,b3,b4,b5,b10; c:\n',
'error': 'The standard deviation errors are: ' 'error': 'The standard deviation errors are: '
}, },
'Cazacu_Barlat3D':{'func' : Cazacu_Barlat3D, 'cb3d' :{'func' : Cazacu_Barlat,
'num' : 18, 'nExpo': 0,'err':np.inf,
'name' : 'Cazacu Barlat', 'bound': [(None,None)]*18,
'paras': 'a1,a2,a3,a4,a5,a6; b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11; c:', 'paras': 'a1,a2,a3,a4,a5,a6; b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11; c:',
'text' : '\nCoefficients of Cazacu Barlat yield criterion for plane stress: \ 'text' : '\nCoefficients of Cazacu Barlat yield criterion: \
\n a1,a2,a3,a4,a5,a6; b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11; c\n', \n a1,a2,a3,a4,a5,a6; b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11; c\n',
'error': 'The standard deviation errors are: ' 'error': 'The standard deviation errors are: '
}, },
'yld200418p' :{'func' : Yld200418p, 'yld200418p' :{'func' : Yld200418p,
'num' : 20, 'nExpo': 1,'err':np.inf,
'name' : 'Yld200418p', 'bound': [(None,None)]*18+[(0.0,12.0)],
'paras': 'Equivalent stress,c12,c21,c23,c32,c31,c13,c44,c55,c66,d12,d21,d23,d32,d31,d13,d44,d55,d66,m:', 'paras': 'c12,c21,c23,c32,c31,c13,c44,c55,c66,d12,d21,d23,d32,d31,d13,d44,d55,d66,m:',
'text' : '\nCoefficients of Yld2004-18p yield criterion: \ 'text' : '\nCoefficients of Yld2004-18p yield criterion: \
\n Y, c12,c21,c23,c32,c31,c13,c44,c55,c66,d12,d21,d23,d32,d31,d13,d44,d55,d66,m\n', \n c12,c21,c23,c32,c31,c13,c44,c55,c66,d12,d21,d23,d32,d31,d13,d44,d55,d66,m\n',
'error': 'The standard deviation errors are: ' 'error': 'The standard deviation errors are: '
}, },
'karafillis' :{'func' : KarafillisBoyce, 'karafillis' :{'func' : KarafillisBoyce,
'num' : 16, 'nExpo': 3,'err':np.inf,
'name' : 'Yld200418p', 'bound': [(None,None)]*12+[(0.0,1.0)]+[(0.0,12.0)]*3,
'paras': 'c11,c12,c13,c14,c15,c16,c21,c22,c23,c24,c25,c26,b1,b2,a,alpha', 'paras': 'c11,c12,c13,c14,c15,c16,c21,c22,c23,c24,c25,c26,alpha,b1,b2,a',
'text' : '\nCoefficients of Karafillis-Boyce yield criterion: \ 'text' : '\nCoefficients of Karafillis-Boyce yield criterion: \
\n c11,c12,c13,c14,c15,c16,c21,c22,c23,c24,c25,c26,b1,b2,a,alpha\n', \n c11,c12,c13,c14,c15,c16,c21,c22,c23,c24,c25,c26,alpha,b1,b2,a\n',
'error': 'The standard deviation errors are: ' 'error': 'The standard deviation errors are: '
} }
} }
for key in fittingCriteria.keys():
if 'num' in fittingCriteria[key].keys():
fittingCriteria[key]['bound']=[(None,None)]*fittingCriteria[key]['num']
fittingCriteria[key]['guess']=np.ones(fittingCriteria[key]['num'],'d')
thresholdParameter = ['totalshear','equivalentStrain'] thresholdParameter = ['totalshear','equivalentStrain']
#--------------------------------------------------------------------------------------------------- #---------------------------------------------------------------------------------------------------
class Loadcase(): class Loadcase():
#--------------------------------------------------------------------------------------------------- #---------------------------------------------------------------------------------------------------
@ -977,16 +918,16 @@ class Criterion(object):
print('fitting to the %s criterion'%name) print('fitting to the %s criterion'%name)
def fit(self,stress): def fit(self,stress):
global fitResults global fitResults; fitErrors
if options.exponent > 0.0: nExponent = nExpo
else: nExponent = 0
nameCriterion = self.name.lower() nameCriterion = self.name.lower()
criteriaClass = fittingCriteria[nameCriterion]['func'] criteria = Criteria(nameCriterion,self.uniaxial,self.expo)
numParas = fittingCriteria[nameCriterion]['num'] textParas = fitCriteria[nameCriterion]['text'] + formatOutput(numParas+nExponent)
textParas = fittingCriteria[nameCriterion]['text'] + formatOutput(numParas) textError = fitCriteria[nameCriterion]['error']+ formatOutput(numParas+nExponent,'%-14.8f')+'\n'
textError = fittingCriteria[nameCriterion]['error']+ formatOutput(numParas,'%-14.8f')+'\n' bounds = fitCriteria[nameCriterion]['bound'] # Default bounds, no bound
bounds = fittingCriteria[nameCriterion]['bound'] # Default bounds, no bound guess0 = Guess # Default initial guess, depends on bounds
guess0 = fittingCriteria[nameCriterion]['guess'] # Default initial guess, depends on bounds
criteria = criteriaClass(0.0)
if fitResults == [] : initialguess = guess0 if fitResults == [] : initialguess = guess0
else : initialguess = np.array(fitResults[-1]) else : initialguess = np.array(fitResults[-1])
@ -1003,6 +944,10 @@ class Criterion(object):
pcov = pcov * s_sq pcov = pcov * s_sq
perr = np.sqrt(np.diag(pcov)) perr = np.sqrt(np.diag(pcov))
fitResults.append(popt.tolist()) 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 (textParas%array2tuple(popt))
print (textError%array2tuple(perr)) print (textError%array2tuple(perr))
@ -1149,7 +1094,7 @@ parser.add_option('-l','--load' , dest='load', type='float', nargs=3,
help='load: final strain; increments; time %default', metavar='float int float') help='load: final strain; increments; time %default', metavar='float int float')
parser.add_option('-g','--geometry', dest='geometry', type='string', parser.add_option('-g','--geometry', dest='geometry', type='string',
help='name of the geometry file [%default]', metavar='string') help='name of the geometry file [%default]', metavar='string')
parser.add_option('-c','--criterion', dest='criterion', choices=fittingCriteria.keys(), parser.add_option('-c','--criterion', dest='criterion', choices=fitCriteria.keys(),
help='criterion for stopping simulations [%default]', metavar='string') help='criterion for stopping simulations [%default]', metavar='string')
parser.add_option('-f','--fitting', dest='fitting', choices=thresholdParameter, parser.add_option('-f','--fitting', dest='fitting', choices=thresholdParameter,
help='yield criterion [%default]', metavar='string') help='yield criterion [%default]', metavar='string')
@ -1165,6 +1110,10 @@ parser.add_option('-d','--dimension', dest='dimension', type='int',
help='dimension of the virtual test [%default]', metavar='int') help='dimension of the virtual test [%default]', metavar='int')
parser.add_option('-v', '--vegter', dest='vegter', action='store_true', parser.add_option('-v', '--vegter', dest='vegter', action='store_true',
help='Vegter criteria [%default]') help='Vegter criteria [%default]')
parser.add_option('-e', '--exponent',dest='exponent', type='float',
help='exponent of non-quadratic criteria')
parser.add_option('-u', '--uniaxial',dest='eqStress', type='float',
help='Equivalent stress')
parser.set_defaults(min = 12) parser.set_defaults(min = 12)
parser.set_defaults(max = 30) parser.set_defaults(max = 30)
parser.set_defaults(threads = 4) parser.set_defaults(threads = 4)
@ -1175,7 +1124,7 @@ parser.set_defaults(fitting = 'totalshear')
parser.set_defaults(geometry = '20grains16x16x16') parser.set_defaults(geometry = '20grains16x16x16')
parser.set_defaults(dimension = 3) parser.set_defaults(dimension = 3)
parser.set_defaults(vegter = 'False') parser.set_defaults(vegter = 'False')
parser.set_defaults(exponent = -1.0)
options = parser.parse_args()[0] options = parser.parse_args()[0]
@ -1199,6 +1148,21 @@ if not os.path.isfile('numerics.config'):
if not os.path.isfile('material.config'): if not os.path.isfile('material.config'):
print('material.config file not found') print('material.config file not found')
numParas = len(fitCriteria[options.criterion]['bound'])
nExpo = fitCriteria[options.criterion]['nExpo']
Guess = []
if options.exponent > 0.0:
numParas = numParas-nExpo # User defines the exponents
fitCriteria[options.criterion]['bound'] = fitCriteria[options.criterion]['bound'][:numParas]
for i in xrange(numParas):
temp = fitCriteria[options.criterion]['bound'][i]
if fitCriteria[options.criterion]['bound'][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)
print Guess
print fitCriteria[options.criterion]['bound']
if options.vegter is True: if options.vegter is True:
options.dimension = 2 options.dimension = 2
unitGPa = 10.e8 unitGPa = 10.e8