Locking‐free interface failure modeling by a cohesive discontinuous Galerkin method for matching and nonmatching meshes. (5th February 2020)

• Record Type: Journal Article
• Authors: Bayat, Hamid Reza; Rezaei, Shahed; Brepols, Tim; Reese, Stefanie
• Is Part Of: International journal for numerical methods in engineering. Volume 121:Number 8(2020)
• Page Start: 1762
• Page End: 1790
• Publication Date: 2020-02-05
• Subjects: cohesive zone -- crack propagation -- discontinuous Galerkin -- hanging nodes -- locking; Numerical analysis -- Periodicals; Engineering mathematics -- Periodicals; 620.001518
• DOI: 10.1002/nme.6286
• Languages: English
• ISSNs: 0029-5981

Abstract

Summary: In this work, modeling of brittle failure of the interface for a linear elastic material is presented. The idea is to integrate a novel extrinsic cohesive zone model into the incomplete interior penalty Galerkin variant of the discontinuous Galerkin (DG) method. As a result, the initial stiffness in the prefailure regime is omitted without having to remesh the crack path during the crack propagation. The interface model is used in combination with different discretization techniques, including matching and nonmatching meshes. This is possible due to the DG method's weak continuity constraint. Moreover, the locking problem in the bulk is cured by the application of a reduced Gaussian integration scheme on the boundary terms. The performance of the new cohesive discontinuous Galerkin elements with different integration schemes is compared with one of the standard intrinsic cohesive models. Due to the elimination of locking, crack initiation at the interface can be realistically displayed.