An analysis of the localization of deformation and weight loss during single-particle normal impact

Abstract

Localized lip formation and subsequent lip fracture is the dominant mechanism by which material is removed during the normal incidence of single spherical particles on ductile targets. A theoretical model which predicts the extent of lip formation as well as the weight loss during these single impact experiments is presented. The model postulates that the lip formation is the result of localization of deformation in the near-surface regions of the target and that the lip is removed either by inertial-stress-induced tensile fracture or by separation across adiabatic shear bands formed at the base of the lip. The single-impact data for copper, brass, thoria dispersed (TD) Nickel and nickel targets are shown to compare very well with the predictions of the model.