Author: Ken Zou - Associate Professor, Mechanical & Aerospace Engineering, The University of Alabama in Huntsville

Abstract:

Numerical simulations are playing an ever-increasing role in the modern design and analysis of engineering structures and systems under dynamic loadings. The models used in simulation codes to describe the dynamic response of the materials (plasticity, damage with the possibility of failure) must be realistic enough if numerical simulations are to be truly predictive. In this talk, some of the challenges in developing three-dimensional models and associated numerical algorithms for materials under high-rate conditions will be discussed. As examples, several material models that were recently developed [1-3] for plastic deformation, solid-solid phase transformations, damage and failure due to microcracks and voids will be presented. Comparisons of the model calculations and data of dynamic experiments (high-velocity plate impacts, explosively-loaded structures) will also be shown.

[1] Zuo, Q.H. and J.R. Rice (2008), “An Implicit Algorithm for a Rate-dependent Ductile Failure Model,” Journal of Applied Physics, 104, 083526.

[2] Zuo, Q.H., J.K. Dienes, J. Middleditch and H.W. Meyer Jr. (2008), “Modeling Anisotropic Damage in an Encapsulated Ceramic under Ballistic Impact,” Journal of Applied Physics, 104, 023508.

[3] Zuo, Q.H., E.N. Harstad, F.L. Addessio and C.W. Greeff (2006), “A Model for Plastic Deformation and Phase Transformations of Zirconium under High-rate Loading,” Modelling and Simulation in Materials Sciences and Engineering, 14, 1465-1484.