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DAMASK_EICMD
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guide choice of strain measure that makes sense

This commit is contained in:
Martin Diehl 2022-12-26 13:28:53 +01:00
parent a2a4054a37
commit e658f3126b
1 changed files with 14 additions and 6 deletions
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20
python/damask/_result.py
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@ -1194,12 +1194,14 @@ class Result:
@staticmethod @staticmethod
def _add_strain(F: Dict[str, Any], t: Literal['V', 'U'], m: float) -> Dict[str, Any]: def _add_strain(F: Dict[str, Any], t: Literal['V', 'U'], m: float) -> Dict[str, Any]:
side = 'left' if t == 'V' else 'right'
return { return {
'data': mechanics.strain(F['data'],t,m), 'data': mechanics.strain(F['data'],t,m),
'label': f"epsilon_{t}^{m}({F['label']})", 'label': f"epsilon_{t}^{m}({F['label']})",
'meta': { 'meta': {
'unit': F['meta']['unit'], 'unit': F['meta']['unit'],
'description': f"strain tensor of {F['label']} ({F['meta']['description']})", 'description': f'strain tensor of order {m} based on {side} stretch tensor '+\
f"of {F['label']} ({F['meta']['description']})",
'creator': 'add_strain' 'creator': 'add_strain'
} }
} }
@ -1224,18 +1226,24 @@ class Result:
Examples Examples
-------- --------
Add the Biot strain based on the deformation gradient 'F': Add the Euler-Almansi strain:
>>> import damask >>> import damask
>>> r = damask.Result('my_file.hdf5') >>> r = damask.Result('my_file.hdf5')
>>> r.add_strain(t='U',m=0.5) >>> r.add_strain(t='V',m=-1.0)
Add the plastic Euler-Almansi strain based on the Add the plastic Biot strain:
plastic deformation gradient 'F_p':
>>> import damask >>> import damask
>>> r = damask.Result('my_file.hdf5') >>> r = damask.Result('my_file.hdf5')
>>> r.add_strain('F_p','V',-1) >>> r.add_strain('F_p','U',0.5)
Notes
-----
The incoporation of rotational parts into the elastic and plastic
deformation gradient requires it to use material/Lagragian strain measures
(based on 'U') for plastic strains and spatial/Eulerian strain measures
(based on 'V') for elastic strains when calculating averages.
""" """
self._add_generic_pointwise(self._add_strain,{'F':F},{'t':t,'m':m}) self._add_generic_pointwise(self._add_strain,{'F':F},{'t':t,'m':m})