Finite-deformation irreversible cohesive elements for three-dimensional crack-propagation analysis

TLDR

The authors develop a three‑dimensional finite‑deformation cohesive element and a class of irreversible cohesive laws to accurately and efficiently track dynamically growing cracks. The method employs a cohesive element that governs crack‑flank separation with an irreversible law, generates free surfaces, and integrates with conventional finite‑element meshes, as demonstrated by simulating a drop‑weight dynamic fracture test. The approach accurately reproduces the experimentally observed crack‑tip trajectory. © 1999 John Wiley & Sons, Ltd.

Abstract

We develop a three-dimensional finite-deformation cohesive element and a class of irreversible cohesive laws which enable the accurate and efficient tracking of dynamically growing cracks. The cohesive element governs the separation of the crack flanks in accordance with an irreversible cohesive law, eventually leading to the formation of free surfaces, and is compatible with a conventional finite element discretization of the bulk material. The versatility and predictive ability of the method is demonstrated through the simulation of a drop-weight dynamic fracture test similar to those reported by Zehnder and Rosakis. The ability of the method to approximate the experimentally observed crack-tip trajectory is particularly noteworthy. © 1999 John Wiley & Sons, Ltd.