cratepy.material.materialoperations.compute_material_log_strain¶
- compute_material_log_strain(def_gradient)[source]¶
Material logarithmic strain from deformation gradient.
\[\boldsymbol{E} = \frac{1}{2} \ln (\boldsymbol{F}^{T} \boldsymbol{F})\]where \(\boldsymbol{E}\) is the material logarithmic strain tensor and \(\boldsymbol{F}\) is the deformation gradient.
- Parameters:
def_gradient (numpy.ndarray (2d)) – Deformation gradient.
- Returns:
material_log_strain – Material logarithmic strain.
- Return type:
numpy.ndarray (2d)