Author(s)

J. Eftis & J.A. Nemes

Abstract

Viscoplastic-microdamage constitutive modeling of dynamic fracture J. Eftis," J.A. Nemes* " Department of Civil, Mechanical and Environmental Engineering, George Washington University, Washington D.C. 20052, USA * Department of Mechanical Engineering, Me Gill University, Montreal, PQ, Canada H3A 2K6 ABSTRACT Spall type fracture of a circular plate caused by mechanical impact and high strain rate fracture of a tensile bar caused by dynamic load application are described using a viscoplastic-damage type of constitutive model. Identification of the microvoid volume fraction of polycrystalline materials as a microdamage scalar field variable, and inclusion into an elastic-viscoplastic constitutive theory enables description of rate-dependent compressible inelastic deformation that includes material degradation culminating in fracture. Calculations simulating the spall fracture and fragmentation of a circular plate induced by high velocity impact, and the nec

Keywords