Nonlocal microdamage constitutive model for high energy impacts

Rashid K. Abu Al-Rub, Anthony N. Palazotto

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

During highly dynamic and ballistic loading processes, large inelastic deformation associated with high strain rates leads, for a broad class of heterogeneous materials, to degradation and failure by localized damage and fracture. However, as soon as material failure dominates a deformation process, the material increasingly displays strain softening and the finite element predictions of ballistic response are considerably affected by the mesh size. This gives rise to non-physical description of the ballistic behavior and mesh-dependent ballistic limit velocities that may mislead the design of ballistic-resistant materials. This study is concerned with the development and numerical implementation of a novel coupled thermo-hypoelasto-viscoplastic and thermoviscodamage constitutive model within the laws of thermodynamics in which an intrinsic material length scale parameter is incorporated through the nonlocal gradient-dependent damage approach. It is shown through simulating plugging failure in ballistic penetration of high-strength steel targets by blunt projectiles that the length scale parameter plays the role of a localization limiter allowing one to obtain meaningful values for the ballistic limit velocity independent of the finite element mesh density. Therefore, the proposed nonlocal damage model leads to an improvement in the modeling and numerical simulation of high velocity impact related problems.

Original languageBritish English
Title of host publicationTime Dependent Constitutive Behavior and Fracture/Failure Processes - Proceedings of the 2010 Annual Conference on Experimental and Applied Mechanics
Pages59-66
Number of pages8
StatePublished - 2011
Event2010 Annual Conference on Experimental and Applied Mechanics - Indianapolis, IN, United States
Duration: 7 Jun 201010 Jun 2010

Publication series

NameConference Proceedings of the Society for Experimental Mechanics Series
Volume3
ISSN (Print)2191-5644
ISSN (Electronic)2191-5652

Conference

Conference2010 Annual Conference on Experimental and Applied Mechanics
Country/TerritoryUnited States
CityIndianapolis, IN
Period7/06/1010/06/10

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