mkit.physics.cell.tetra cauchy_strain cauchy_strain(_F: D33Like) -> D33 Cauchy strain tensor (right Cauchy-Green deformation tensor). Reference https://en.wikipedia.org/wiki/Finite_strain_theory#Cauchy_strain_tensor_(right_Cauchy%E2%80%93Green_deformation_tensor) deformation_gradient deformation_gradient(disp: D43Like, points: D43Like) -> D33 grad_op grad_op(points: D43Like) -> D34 lagrangian_strain lagrangian_strain(disp: D43Like, points: D43Like) -> D33 Lagrangian finite strain tensor. Reference https://en.wikipedia.org/wiki/Finite_strain_theory#Finite_strain_tensors volume volume(_points: D43Like) -> D