A mechanical method of tensile strength prediction for liquids with the application of a new model for void nucleation

摘要

A new model for void nucleation, employed in the mechanical method of tensile strength prediction for liquids, is presented in this paper based on classical nucleation theory and energy conservation analysis. The dependence of surface tension on void radius, which is presented in the method of Tolman's correction, could influence the total energy for void nucleation, including the surface energy and the work of external tensile load. NAG (nucleation and growth) scheme is used in the present mechanical model to study the tensile process of the Al melt. The calculation results of material strength and void evolution of the melt under a high strain rate by using present mechanical method are studied and compared with those by MD (molecular dynamics) simulation.