某大口径机枪枪管的瞬态热弹耦合动力响应分析

Dynamic Response Analysis of Transient Thermoelasticity Couple of a Large-calibre Machine Gun Barrel

以某大口径机枪枪管为研究对象,建立了枪管的热弹耦合模型,使用与温度相关的材料模型,计算了枪管在高频循环动态热脉冲和动态压力脉冲共同作用下的瞬态温度响应和瞬态应力响应,分析了热脉冲与压力脉冲的耦合效应,并对拟静态计算法和动态全耦合计算法进行了比较.研究表明:热脉冲与膛压脉冲的动力响应具有表面效应,枪管内膛表面承受脉冲冲击最强,动力效应最大,动力效应沿径向向外迅速衰减;热脉冲与膛压脉冲在内膛表面耦合效应十分明显,采用动态全耦合方法进行计算更加准确.

The thermoelasticity coupling model of barrel was established according to study of a certain large-calibre machine gun barrel. Transient temperature response and transient stress response of the barrel to the action of high-frequency cyclic dynamic thermal pulse and dynamic pressure pulse were calculated by using a material model related to temperature, and the coupling effect of thermal pulse and pressure pulse was analyzed. The results obtained by quasi-static calculation method and dynamic full coupled calculation method were compared. The study shows that the dynamic responses of thermal pulse and pressure pulse have surface effect. The inner bore of the barrel receives the strongest pulse impact and has the biggest dynamic effect, which declined outwards along the radius. The coupling effect of thermal pulse and pressure pulse in the inner bore is extremely obvious, so more accurate resuits can be obtained by using dynamic full coupled calculation method.