爆炸粉末烧结颗粒沉能和温度分布规律分析

借助于ls-dyna有限元分析程序对爆炸粉末烧结过程中颗粒间的变形和沉能过程进行了数值模拟,将爆炸烧结过程中颗粒间的结合和沉能机制区分为微爆炸焊接、微摩擦焊接、微孔隙闭合等,在考虑摩擦效应和传热的基础上计算了由上述沉能方式引起的热力耦合的颗粒温度分布,给出了爆炸烧结过程中不同沉能机制形成的局部高温区域,计算结果同爆炸烧结实验现象吻合良好。结果表明:温度由颗粒表面向颗粒中心呈较大的梯度分布,在适当的冲击压力下,颗粒表面温度将达到材料熔点。

Analysis of Particle Temperature Distribution in Explosive Consolidation of Powders

Numerical simulation of deformation and energy deposition in explosive consolidation of powders is taken by using Ls-dyna program.Mechanism of deformation and energy deposition is divided into micro-explosive welding,friction welding and void collapse etc.Temperature distribution of particle is calculated on the basis that friction and heat transfer are considered and the results are well in accord with the experimental phenomena.The results show that there is a large grads temperature distribution from the surface to the center of the particle and the temperature on the surface of the particle will reach the melting point of the material on proper impact pressure.