Journal
ENGINEERING FRACTURE MECHANICS
Volume 76, Issue 6, Pages 730-741Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2008.06.002
Keywords
Dynamic instability; Microcrack branching; Microvoids; Meshfree cracking particle method
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Crack instabilities and the phenomenon of crack speed saturation in a brittle material (PMMA) are studied with a meshfree cracking particle method. We reproduce the experimental observation that the computed terminal crack speeds attained in PMMA specimens are substantially lower than the Rayleigh wave speed; the computed crack speeds agree quite well with the reported experimental results. We also replicate repetitive microcrack branching along with the increased rate of energy dissipation after attainment of a critical crack speed, even in the absence of microstructural defects. We show that the presence of microdefects changes the response only a little. The computations reproduce many of the salient features of experimental observations. (C) 2008 Elsevier Ltd. All rights reserved.
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