期刊
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
卷 70, 期 -, 页码 262-280出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmps.2014.05.018
关键词
Void; Dislocation; Drag; Spall; Strain-rate
资金
- National Science Foundation Graduate Research Fellowship [DGE-1232825]
- Army Research Laboratory under the MEDE Collaborative Research Alliance [W911NF-12-2-0022]
Here we examine the role of dislocation kinetics and substructure evolution on the dynamic growth of voids under very high strain rates, and develop a methodology for accounting for these effects in a computationally efficient manner. In particular, we account for the combined effects of relativistic dislocation drag and an evolving mobile dislocation density on the dynamics of void growth. We compare these effects to the constraints imposed by micro-inertia and discuss the conditions under which each mechanism governs the rate of void growth. The consequences of these constraints may be seen in a number of experimental observations associated with dynamic tensile failure, including the extreme rate-sensitivity of spall strength observed in laser shock experiments, an apparent anomalous temperate dependence of spall strength, and some particular features of void size distributions on spall surfaces. (C) 2014 Elsevier Ltd. All rights reserved.
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