Numerical simulations of failure of brittle solids under dynamic impact using a new computer program - DIFAR

Kam Tim Chau, W. C. Zhu, C. A. Tang, S. Z. Wu

Research output: Journal article publicationConference articleAcademic researchpeer-review

19 Citations (Scopus)


This paper presents a new computer program called DIFAR (or dynamic incremental failure analysis of rock) that can simulate fracture process of brittle rocks under dynamic impacts. The program is based on a linear elastic finite element method incorporated with a failure criterion for damage checking. Modulus is reduced once the failure criterion is satisfied. In addition, Weibull distribution of the modulus and strength of the elements are used for modeling the mesoscopic heterogeneity. The failure criterion is a Mohr-Coulomb type of condition with a tensile cut-off, in which strength parameters are functions of the strain rate. More importantly, the whole fracture process of rock fragmentation can be simulated, including initiation, propagation, and coalescence of microcracks. The program DIFAR has been used to simulate elastic wave propagation and nonlinear fragmentation, and validity and efficiency of this program is demonstrated. The program can be considered as a dynamic counterpart of the RFPA, a failure analysis program for static loads, developed at Northeastern University, China.
Original languageEnglish
Pages (from-to)239-244
Number of pages6
JournalKey Engineering Materials
Issue numberI
Publication statusPublished - 27 Jul 2004
EventAdvances in Fracture and Failure Prevention: Proceedings of the Fifth International Conference on Fracture and Strength of Solids (FEOFS2003): Second International Conference on Physics and Chemistry of Fracture and Failure Prevention (2nd ICPCF) - Sendai, Japan
Duration: 20 Oct 200322 Oct 2003


  • Bars
  • Dynamic fragmentation
  • Finite element program
  • Spheres
  • Strain-rate-dependent

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering


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