Void Growth and Coalescence Simulations
Abstract
Recent experiments, in which voids are precision cut using a second laser, have been used to study void coalescence. In that study, both the Rice and Tracey model and the Thomason model were shown to have reasonable agreement with experiment results for the copper, in most cases. However, no simulations were performed in which voids were explicitly represented. This article uses finite element simulations to describe void coalescence as observed in copper bar uniaxial tension experiments. Several problems occur when meshing the three-dimensional geometry containing 176 voids, namely element distortion and damage, minimum time step, and appropriate material model parameters. Further, a temporal and spatial convergence study was used to estimate errors, thus, this study helps to provide guidelines for modeling of materials with voids. Finally, we use a Gurson model with Johnson-Cook strength to simulate the void growth. Simulations, using the codes ABAQUS explicit, EPIC, and Presto, agree well with experiments.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 2013
- Accession Number
- ADA593137
Entities
People
- Derek J. Reding
- Michael E. Nixon
- Pavol Stofko
- Robert J. Dorgan