cratepy.material.materialoperations.compute_material_log_strain

compute_material_log_strain(def_gradient)

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)