冲击载荷下自增强身管残余应力变化规律

基于有限元分析方法,建立速射火炮身管截面的有限元模型,采用直接耦合的方法,模拟了承受热应力和火药燃气压力的自紧身管在先50连发、冷却后再连发10发过程中身管的残余应力,得到并分析了残余应力的变化规律,指出内壁薄层的塑性变形和残余应力的反复变化,不利于内壁的稳定,还提出了减小残余应力变化程度的策略.

Residual stress variation in an autofrettaged barrel under impact load

Based on the finite element analysis software,a finite element model was established for the rapid-firing gun cross-section to explore the residual stress in the autofrettaged barrel,which was influenced by the high-temperature,high-pressure and high-speed explosive gas when shooting.And the direct coupling method was employed as a solving strategy to analyze the residual stress in the autofrettaged barrel in the process of 50 continuous shots first and 10 shots after cooling.Investigated result displays that the repeated changing of the plastic strain and residual stress in the inner wall is harmful to the stabilization of the inner wall.And the measures were put forward to reduce the change of the residual stress.