An Implementation of Regularized Extended Finite Element Method in Abaqus/Explicit

The main objective of the present effort is to enhance the Regularized eXtended Finite Element Method (Rx-FEM) framework in Abaqus by adding the capability of explicit dynamics analysis. In this work, the Rx-FEM has been implemented in Abaqus/Explicit for modeling fracture and damage in laminated composites. The Rx-FEM implementation in Abaqus/Explicit via user-defined subroutines allows insertion and propagation of mesh-independent matrix cracks (MIC) in any ply of a laminated composites without a priori knowledge of matrix crack location and orientation. A mixed-mode cohesive zone model (CZM) is applied for both intralaminar and interlaminar damage. The capabilities of the proposed implementation are demonstrated by modeling a two-dimensional laminated composites with stacking sequence [05/903]s subjected to low-velocity line impact. The intra-ply damage mechanisms modeled by MIC technique in the middle 90o layers and the inter-ply delamination in the 0o/90o interfaces are considered in the finite element model. The numerical predictions are in good agreement with the existing experiments in the literature. As a result, the implementation is able to capture the damage process of laminated composites under impact loading including the initiation and propagation of matrix cracks, and the crack-induced delamination at the intersections between matrix cracks and adjacent plies.