Dynamic Damage Evolution of Solids in Compression: Microcracking, Plastic Flow,and Brittle-Ductile Transition

摘要

Dynamic compressive damage evolution in solids, associated with brittlemicrocracking and ductile plastic flow, is modeled through plastic flow and tensile microcracking, which are induced by the deformation of preexisting microflaws at grain boundaries, slip bands, and micro cavities. The micromechanical aspect of this model is discussed in terms of the dominance of microcracking or plastic flow, and possible transition from microcracking to plastic flow is investigated. The effect of lateral confinement on the dynamic damage evolution is investigated, emphasizing the brittle-ductile transition. (AN).