Require stress in shape (3,3) or (6,) #77
Merged
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Desired behaviour:
Stress can either be supplied in Voigt notation (6,) or as a full 3x3 matrix. If the stress property has any other shape an error should be raised.
Previous behaviour:
If a (n,) vector is supplied, the first six elements are taken to be stress matrix in Voigt notation. Hence if a flattened 3x3 matrix (ie of shape (9,)) is supplied, one would obtain insensible stresses.