Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/34858
Title: Numerical simulations of failure of brittle solids under dynamic impact using a new computer program - DIFAR
Authors: Chau, KT 
Zhu, WC
Tang, CA
Wu, SZ
Keywords: Bars
Dynamic fragmentation
Finite element program
Spheres
Strain rate-dependent
Issue Date: 2004
Publisher: Scientific.Net
Source: Key engineering materials, 2004, v. 261-263, p. 239-244 How to cite?
Journal: Key engineering materials 
Abstract: 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.
URI: http://hdl.handle.net/10397/34858
ISSN: 1013-9826 (print)
1662-9795 (online)
DOI: 10.4028/www.scientific.net/KEM.261-263.239
Appears in Collections:Conference Paper

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