Abstract
A developed microstructure-based internal state variable (ISV) plasticity damage model is for the first time used for simulating penetration mechanics of aluminum to find out its penetration properties. The ISV damage model tries to explain the interplay between physics at different length scales that governs the failure and damage mechanisms of materials by linking the macroscopic failure and damage behavior of the materials with their micromechanical performance, such as void nucleation, growth, and coalescence. Within the continuum modeling framework, microstructural features of materials are represented using a set of ISVs, and rate equations are employed to depict damage history and evolution of the materials. For experimental calibration of this damage model, compression, tension, and torsion straining conditions are considered to distinguish damage evolutions under different stress states. To demonstrate the reliability of the presented ISV model, that model is applied for studying penetration mechanics of aluminum and the numerical results are validated by comparing with simulation results yielded from the Johnson-Cook model as well as analytical results calculated from an existing theoretical model.
Highlights
High-speed impact and penetration problems include large deformation, erosion, high strain-rate dependent nonlinear material behavior, and fragmentation
The Johnson-Cook (JC) constitutive model first presented in 1983 [1, 2] and its modified versions are being integrated into commercial finite element analysis (FEA) solvers such as LS-DYNA and ABAQUS for simulation of the high-rate damage process including high-speed impact and penetration
One virtue of this study is to extend application of the developed internal state variable (ISV) damage model for simulation of high-speed penetration process of metals, in which the strain rate can reach up to ∼109/s
Summary
High-speed impact and penetration problems include large deformation, erosion, high strain-rate dependent nonlinear material behavior, and fragmentation. Temperature and strain-rate dependent model, the JC model is the most widely used model for computational study of penetration mechanics of different metallic materials It was employed by Dey et al [3] for assessing the ballistic perforation resistance of double-layered steel plates impacted by blunt and ogival projectiles. Based on the large amount of experimental data, an analytical model of high accuracy was presented by Rosenberg and Forrestal [12] and verified by Piekutowski et al [13] to be able to correctly predict the penetration performance of Al. the numerical results calculated from the ISV damage model will again be compared with the analytical results to further validate its applicability for high-speed penetration study
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