An important role of elastic vortices in unsteady propagation of longitudinal shear cracks in brittle materials

Evgeny V. Shilko, Sergey G. Psakhie, Valentin L. Popov

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The paper is devoted to the numerical study of some fundamental aspects of longitudinal shear crack propagation in sub-Rayleigh and supershear regimes. The simulation was carried out with use of particle-based movable cellular automaton method. It is shown that a well-known phenomenon of shear crack acceleration towards longitudinal wave speed is explained by the formation and development of elastic vortex traveling ahead of the crack tip at a shear wave velocity. The stress concentration area ahead of the crack tip revealed by different authors is connected with the elastic vortex. Shear crack accelerates towards the longitudinal wave speed through the formation of a daughter crack by the mechanism of shearing (the daughter crack is formed in the center of elastic vortex). Analysis of sub-Raleigh-to-intersonic transition showed that the condition of this transition can be expressed in terms of dimensionless geometrical crack parameter.

Original languageEnglish
Title of host publicationProceedings of the 4th International Conference on Particle-Based Methods - Fundamentals and Applications, PARTICLES 2015
PublisherInternational Center for Numerical Methods in Engineering
Pages22-33
Number of pages12
ISBN (Print)9788494424472
Publication statusPublished - 2015
Event4th International Conference on Particle-Based Methods, PARTICLES 2015 - Barcelona, Spain
Duration: 28 Sep 201530 Sep 2015

Other

Other4th International Conference on Particle-Based Methods, PARTICLES 2015
CountrySpain
CityBarcelona
Period28.9.1530.9.15

Keywords

  • Crack
  • DEM
  • Dynamic fracture
  • Elastic vortex
  • Movable cellular automata

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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  • Cite this

    Shilko, E. V., Psakhie, S. G., & Popov, V. L. (2015). An important role of elastic vortices in unsteady propagation of longitudinal shear cracks in brittle materials. In Proceedings of the 4th International Conference on Particle-Based Methods - Fundamentals and Applications, PARTICLES 2015 (pp. 22-33). International Center for Numerical Methods in Engineering.