柱形容器约束下内装粉体冲击响应特性

The density evolution and distribution characteristics of powder in a submunition under impact loadingare studied. Based on the porous material model and the test parameters of the powder, a simulation model of impact loading is established by using finite element analysis software. Machete impact tests under typical working conditions are compard. The simulated results are constant with the test results. The simulated results show that the density change of powder in the submunition during impact loading can be divided into the stable and growth stages, which can form four regions: densification, growth, retention and interspace regions. The width of each region changes linearly with the loading time, and the density distribution of powder has a significant gradient difference. The research results can provide reference for the investigation on the dynamic behavior of submunition which is impacted by the distribution changes of powder.