fedoo.constitutivelaw.CohesiveLaw.get_tangent_matrix

CohesiveLaw.get_tangent_matrix(assembly, delta=None, damage_gradient=None)

Return the selected tangent stiffness in local coordinates.

The consistent correction is active only while damage grows beyond its committed value. During unloading, reloading below the historical maximum, and after complete failure, damage_gradient is zero and this method returns the damaged secant stiffness.