title: Computational modeling and simulation of spall fracture in polycrystalline solids by an atomistic-based interfacial zone model.
abstract: The focus of this work is to investigate spall fracture in polycrystalline materials under high-speed impact loading by using an atomistic-based interfacial zone model. We illustrate that for polycrystalline materials, increases in the potential energy ratio between grain boundaries and grains could cause a fracture transition from intergranular to transgranular mode. We also found out that the spall strength increases when there is a fracture transition from intergranular to transgranular. In addition, analysis of grain size, crystal lattice orientation and impact speed reveals that the spall strength increases as grain size or impact speed increases.
authors.affiliation: Department of Mechanical Engineering, University of Texas, San Antonio, TX 78249, USA.
authors.forename: Liqiang
authors.initials: L
authors.lastname: Lin
authors.affiliation: Department of Mechanical Engineering, University of Texas, San Antonio, TX 78249, USA.
authors.forename: Xiaowei
authors.initials: X
authors.lastname: Zeng
keywords: high-speed impact; interface zone model; intergranular fracture; multiscale; polycrystalline solid; spall fracture; transgranular fracture