Modeling Deformation, Damage and Failure of Materials under Dynamic Loading

Dr. Ken Zuo

Department of Mechanical and Aerospace Engineering
University of Alabama in Huntsville

February 9, 2007
202 Madison Hall
3:00 PM (Coffee and Cookies at 2:30 in 201 Madison Hall)

Abstract

Accurately predicting the dynamic response of solid materials under high-rate loading has important implications in civil and defense applications. In this presentation I will discuss some recent research effort at UAH and Los Alamos National Lab to develop physics-based computational models for predicting the dynamic response of materials, including plastic deformation, solid-solid phase transformations, damage due to growth of microcracks and voids, and ultimate failure and fragmentation. Several models [1-4] that were recently developed and implemented in analysis codes (e.g. EPIC) for three-dimensional, large strain, high-rate applications will be discussed. Comparisons of model calculations and experimental data of several application problems involving high-rate loading (high-velocity impact of zirconium plates, explosively-loaded metallic shell, multiple-shock initiation of high explosives) will be presented.

References

1. Zuo et al. (2006), A Model for Plastic Deformation and Phase Transformations of Zirconium under High-rate Loading, Modelling and Simulation in Materials Science and Engineering, Institute of Physics Publishing, 14, 1465-1484.
2. Dienes et al. (2006), Impact Initiation of Explosives and Propellants via Statistical Crack Mechanics, Journal of the Physics and Mechanics of Solids, 54, 1237-1275.
3. Zuo et al. (2006), A Rate-Dependent Damage Model for Brittle Materials Based on the Dominant Crack, International Journal of Solids and Structures, 43, 3350-3380.
4. Gray et al. (2005), Predicting Material Strength, Damage, and Fracture: The Synergy between Experiment and Modeling, ASM Journal of Failure Analysis and Prevention, 5, 7-17.