Simulations of instability in dynamic fracture by the cracking particles method

Timon Rabczuk, Jeong Hoon Song, Ted Belytschko

Research output: Contribution to journalArticle

110 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)730-741
Number of pages12
JournalEngineering Fracture Mechanics
Volume76
Issue number6
DOIs
Publication statusPublished - 2009 Apr

Keywords

  • Dynamic instability
  • Meshfree cracking particle method
  • Microcrack branching
  • Microvoids

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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