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The erosion process is studied from a solid mechanics perspective. This paper describes the analysis of multiple coincident particle impacts of an elastic steel sphere on an elastic-plastic copper target material. The analysis is performed using the DYNA2D nonlinear dynamic finite element code. The results of the DYNA2D analysis are compared against experimental results for the single impact case. Next, three methods of computing the damage induced by the impact process are studied; a strain-life approach using rainflow counting, the technique of cyclic plastic work, and a continuum damage mechanics based fatigue criterion. The damage predicted by each technique is presented and reviewed. Extensions of the procedures are discussed.
continuum damage mechanics, cracking, fatigue (materials), fracture (materials), erosion, solid particle, impact, strain life, cyclic plastic work, nonlinear finite element analysis, modeling analysis
Vice president and principal engineer, Engineering Mechanics Technology Inc., San Jose, CA
President, Daedalus Associates, Inc., Mountain View, CA