针对某身管在一定射弹量后膛线起始部附近铬层剥落严重甚至发生基体金属烧蚀的问题,文中基于随温度变化的材料热物性参数,采用热-结构耦合的方法,对连发过程中的身管,计算其在热应力及火药燃气压力的共同作用下的全等效应力和温度分布。得出温度的计算结果与实测结果误差在7.5%以内,身管最大膛压点附近吸收的热量最多、温度最高,且内壁距内壁深0.3mm的范围内全等效应力最大。

In order to solve the problem that for a certain barrel, after a certain projectile amount, the serious exfoliation of the chromium layer or even the corrosion of the matrix metal appeared near the origin of rifling, based on the thermal physical parameters of material that vary with temperature, by means of thermal-structural coupling method, the fully equivalent stress and temperature distribution of the barrel in the process of running fire under the joint action of the thermal stress and the gas pressure of the gunpowder were calculated. It was found that the error between the calculated temperature and the measured result was within 7.5%. The amount of heat absorbed near the maximum chamber pressure point of the barrel was the largest, and the temperature there was the highest, and the fully equivalent stress is maximum within the range of the inner wall to 0.3 mm depth from the inner wall.