基于有限元分析Workbench软件的多孔发射药挤压过程仿真分析

为了获得特定多孔发射药模具的合理结构参数，应用Workbench软件的流体与固体耦合模块模拟了发射药药料在模腔内的挤压过程及针架的变形。采用单因素法分析了收缩角、成型段长度对挤出成型压力和模具针架系统变形的影响。结果表明：随着成型段长度的加大，压力逐渐增大、挤压药密实性增加、针架系统变形增大；随着收缩角的加大，压力增大、挤压药密实性增加、针架系统变形逐渐减小，在多孔模腔收缩角55°之后，压力增大、变形减小的幅度平缓；收缩段和成型段截面压力差从入口至出口逐渐减小，最后达到均匀分布。

Workbench-based Simulation Analysis of Multi-perforated Gun Propellant in Extrusion Process

In order to obtain the structural parameters of specific multi-perforated gun propellant mould,the fluid-solid coupling module of Workbench is used to simulate the extrusion process of gun propellant slurry in the mold cavity and the deformation process of needle holder.The influences of shrinkage angle and length of molding on the extrusion molding pressure and the deformation of needle holder system are analyzed by the single factor method.The result shows that the compactness of extruded propellant and the deformation of needle holder system increase with the increase in length of forming segment and pressure.With an increase in contraction angle,the pressure and compactness of extruded propellant increase,but the deformation of needle holder system decreases gradually.At more than 55°,the pressure amplitude increases and the amplitude of the system deformation decreases.The pressure difference between the contracting segment and the forming segment is gradually reducedfrom the inlet to the outlet,and the final pressure distribution is uniform.