The Pore Collapse “Hot-Spots” Model Coupled with Brittle Damage for Solid Explosives

Abstract

This paper is devoted to the building of a numerical pore collapse model with “hot-spots” formation for the impacted damage explosives. According to damage mechanical evolution of brittle material, the one-dimensional elastic-viscoplastic collapse model was improved to incorporate the impact damage during the dynamic collapse of pores. The damage of explosives was studied using the statistical crack mechanics (SCRAM). The effects of the heat conduction and the chemical reaction were taken into account in the formation of “hot-spots.” To verify the improved model, numerical simulations were carried out for different pressure states and used to model a multiple-impact experiment. The results show that repeated weak impacts can lead to the collapse of pores and the “hot-spots” may occur due to the accumulation of internal defects accompanied by the softening of explosives.

Analytic Study of Phase Shift Crystal Structure and Temperature Dependent Dielectric Properties of Modified Synthesis One System Ceramics Using BNT-BZT

“…Ammonia solution was added dropwise under constant stirring for the precipitation of simple perovskites [2]. Pressed under the pressure of 5.543 MPa with some drops 3.0 Wt % PVA (polyvinyl alcohol) using the binding of perovskite ceramics of BNT-BZT powder on the disk of 10 mm Dia and 1 -15 mm thickness [3]. The disks were the slag at 890°C for 2.30 hrs, except for the sample with 0.20-mole fractions Zr which was slag at 940°C for 2.30 hrs, in the air.…”