Implementation of OpenMP Parallelization of Rate-Dependent Ceramic Peridynamic Model

Abstract

A rate-dependent peridynamic ceramic model, considering the brittle tensile response, compressive plastic softening and strain-rate dependence, can accurately represent the dynamic response and crack propagation of ceramic materials. However, it also considers the strain-rate dependence and damage accumulation caused by compressive plastic softening during the compression stage, requiring more computational resources for the bond force evaluation and damage evolution. Herein, the OpenMP parallel optimization of the rate-dependent peridynamic ceramic model is investigated. Also, the modules that compute the interactions between material points and update damage index are vectorized and parallelized. Moreover, the numerical examples are carried out to simulate the dynamic response and fracture of the ceramic plate under normal impact. Furthermore, the speed-up ratio and computational efficiency by multi-threads are evaluated and discussed to demonstrate the reliability of parallelized programs. The results reveal that the total wall clock time has been significantly reduced after optimization, showing the promise of parallelization process in terms of accuracy and stability.