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DAMASK_EICMD
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correct handling of arrays 

all strains measures except for logarithmic had wrong off-diagonal
components
This commit is contained in:
Martin Diehl 2019-11-21 19:46:05 +01:00
parent 2e834cc3c1
commit 7a7eea47b5
1 changed files with 6 additions and 6 deletions
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12
python/damask/mechanics.py
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@ -48,10 +48,10 @@ def strain_tensor(F,t,m):
if m > 0.0: if m > 0.0:
eps = 1.0/(2.0*abs(m)) * (+ np.matmul(n,np.einsum('ij,ikj->ijk',w**m,n)) eps = 1.0/(2.0*abs(m)) * (+ np.matmul(n,np.einsum('ij,ikj->ijk',w**m,n))
- np.broadcast_to(np.ones(3),[F_.shape[0],3])) - np.broadcast_to(np.eye(3),[F_.shape[0],3,3]))
elif m < 0.0: elif m < 0.0:
eps = 1.0/(2.0*abs(m)) * (- np.matmul(n,np.einsum('ij,ikj->ijk',w**m,n)) eps = 1.0/(2.0*abs(m)) * (- np.matmul(n,np.einsum('ij,ikj->ijk',w**m,n))
+ np.broadcast_to(np.ones(3),[F_.shape[0],3])) + np.broadcast_to(np.eye(3),[F_.shape[0],3,3]))
else: else:
eps = np.matmul(n,np.einsum('ij,ikj->ijk',0.5*np.log(w),n)) eps = np.matmul(n,np.einsum('ij,ikj->ijk',0.5*np.log(w),n))
@ -190,7 +190,7 @@ def rotational_part(x):
Tensor of which the rotational part is computed. Tensor of which the rotational part is computed.
""" """
return __polar_decomposition(x,'R') return __polar_decomposition(x,'R')[0]
def left_stretch(x): def left_stretch(x):
@ -203,7 +203,7 @@ def left_stretch(x):
Tensor of which the left stretch is computed. Tensor of which the left stretch is computed.
""" """
return __polar_decomposition(x,'V') return __polar_decomposition(x,'V')[0]
def right_stretch(x): def right_stretch(x):
@ -216,7 +216,7 @@ def right_stretch(x):
Tensor of which the right stretch is computed. Tensor of which the right stretch is computed.
""" """
return __polar_decomposition(x,'U') return __polar_decomposition(x,'U')[0]
def __polar_decomposition(x,requested): def __polar_decomposition(x,requested):
@ -227,7 +227,7 @@ def __polar_decomposition(x,requested):
---------- ----------
x : numpy.array of shape (:,3,3) or (3,3) x : numpy.array of shape (:,3,3) or (3,3)
Tensor of which the singular values are computed. Tensor of which the singular values are computed.
requested : list of str requested : iterable of str
Requested outputs: ‘R’ for the rotation tensor, Requested outputs: ‘R’ for the rotation tensor,
‘V’ for left stretch tensor and ‘U’ for right stretch tensor. ‘V’ for left stretch tensor and ‘U’ for right stretch tensor.