Implicit to Explicit Algorithm for ABAQUS Standard User-Subroutine UMAT for a 3D Hashin-Based Orthotropic Damage Model

This study examines a new approach to facilitate the convergence of upcoming user-subroutines UMAT when secant material matrix is applied rather than conventional tangent (also known as Jacobian) matrix. algorithm makes use viscous regularization technique stabilize numerical solution softening models. The Newton–Raphson predictor-corrector ABAQUS then applies this type using only When time step smaller viscosity parameter, may be unsuitable for with because its implicit incorrect, transforming into an undesirable explicit version that cause problems. A novel 3D orthotropic damage model residual stresses proposed study, and it analyzed algorithm. method’s tested implicit-to-explicit well traditional matrices. Furthermore, all models are compared experimental data. It was concluded both were stable robust.