Parallel implementation of implicit finite element model with cohesive zones and collision response using CUDA

Abstract

Summary The aim of this work is to efficiently implement the Park‐Paulino‐Roesler cohesive zone model with the objective of creating realistic high‐resolution simulations of material deformation, fracture, and postfracture behavior. Intrinsically, unstructured meshes can create more realistic fracture patterns in bulk material than structured meshes. Implicit methods, stable for much larger time steps, have greater potential to model both fracture and postfracture behavior without sacrificing speed of execution. Several technical contributions are presented, including (i) GPU‐accelerated implementation of the Park‐Paulino‐Roesler cohesive zone model, (ii) efficient creation of sparse matrix structure, and (iii) comparison of different unloading/reloading relations when using an implicit scheme. A potential‐based collision response scheme was implemented that allows one to model the interaction of fragmented material. Several test simulations are carried out to demonstrate the flexibility of the model and its ability to reproduce different materials under various loading conditions. Benchmarking results show that most of the computational time is spent by the third‐party solver library, meaning that other operations do not require optimization. The library is made available as open source.

Numerical Analysis of Thermoplastically Welded CFRP Structures

“…They have shown, that the traction separation law parameters of Mode II and the free fibre have the most important influence on the pull-out test results in finite element simulation, whereas in peridynamics, the energy release rate as well as the horizon radius were found to be the most important parameters in addition to the free fibre length. The work of Gribanov et al [19] is dedicated to efficiently implement the Park-Paulino-Roesler cohesive zone model (PPR-model) for an efficient simulation of material deformation, fracture and post fracture behaviour compliant, brittle and ductile materials. They developed a library for modelling polycrystalline materials under various types of loading conditions.…”