爆炸粉末烧结微冲击波耗散沉能分析

Analysis of Energy Dissipation by Micro-shock Waves in Explosive Consolidation of Powders

用多层片组冲击动力模型研究了粉末材料爆炸压实过程中颗粒间碰撞引起的能量沉积和微冲击波的发生、耗散过程.为确定粉末材料在冲击压实过程中由微冲击波耗散而沉积的能量,基于热膨胀形式的固体物态方程,等压推广得到了固体材料的等熵卸载线和相应多孔材料的冲击Hugoniot线;计算并分析了冲击载荷作用下多层片组中微冲击波的产生与耗散规律.结果表明,多层片组在冲击载荷作用下由微冲击波耗散引起的温升是均匀的,以孔隙度为1.33的铜粉为例计算了此温升.

An impact model of multi-flyer plates was used to research the energy deposition as well as the arising and dissipation of micro-shock waves caused by impact of particles in explosive consolidation of powders. Recurring to the EOS of the solid material based on thermal expandibility, iso-entropy unloading lines of the material and Hugoniot lines of the porous material were obtained by generalizing it, so the energy deposited by the dissipation of micro-shock waves during explosive consolidation of powders was calculated. The arising and dissipation of micro-shock waves in the plates under shock pressure were analyzed, and the results show that the temperature in the plates is uniform. Copper powder with the initial porosity 1.33 was taken as an example to calculate the rise of the temperature.