某型重机枪身管的多物理场耦合分析

摘要

For studying temperature field and stress field of some type of heavy machine gun barrel with different Cr coating thickness under effect of high temperature,high pressure and high speed gunpowder fluid,barrels with a coating thickness of 0.28 mm,0.35 mm and 0.41 mm is conducted with flow-solid-heat multi-physical field coupling simulating calculation using MpCCI union structure calculating software Abaqus based on multi-physics coupling program interface and coupling calculation method with fluid cal-culating software Fluent.Barrel stress and temperature distribution rule with different Cr thickness is ob-tained by calculation,so it is concluded that it is possible to conduct multi-physics coupling calculation with MpCCI,Abaqus and Fluent;temperature of inner barrel wall and stress go down in turn with increasing coating thickness,but concentrated stress between coating and barrel increases gradually.The conclusion has guiding significance for barrel structure design and life prediction.%为了研究具有不同厚度铬涂层的某型重机枪身管在高温、高压、高速火药流体作用下的温度场和应力场,采用基于多物理场耦合程序接口MpCCI联合结构计算软件Abaqus和流体计算软件Fluent进行耦合计算的方法,对涂层厚度分别为0.28 mm、0.35 mm、0.41 mm的身管进行流-固-热多物理场耦合仿真计算.通过计算得到了不同铬涂层厚度下身管应力和温度的分布规律.结果表明,借助MpCCI联合Abaqus和Fluent进行多物理场耦合计算的方法是可行的;随着涂层厚度的增加身管内壁的温度和应力依次降低,但在涂层与身管结合处的集中应力逐渐增大.结论对身管的结构设计和寿命预测有一定的指导意义.