A unified method for studying impact particle relation and spallation under shock loading

Abstract

Spallation is the phenomenon that under impact loading, the material interior reaches the tensile failure limit instantaneously due to the tensile effect of two sparse waves moving in opposite directions, and cracks are formed in the interior. The specimen of a certain alloy was taken as the research object, and the planar impact experiment was carried out by a 20mm caliber one-stage light gas gun. The free surface particle velocity curve of the alloy specimen was obtained. The Hugoniot state parameters, spallation strength, unloading strain rate and other experimental data were obtained through theoretical analysis. The results show that: The spall strength of the alloy is proportional to the tensile strain rate in the loading range: σs = 0.37 × 10-4 (GPa); the alloy has higher wave impedance and spallation strength compared with C10100. The experimental parameters of Hugoniot state are smaller than those calculated by the mass average method because of the special internal structure of the alloy. The state parameters of the sample can be obtained at the same time by using the material with known Hugoniot state parameters as the flyer.