轻型无坐力炮复合身管的动态应变规律研究

Study on Dynamic Strain Law of Composite Barrel of Light Recoilless Gun

针对轻型无坐力炮复合身管不同位置进行环向动态应变测试。测试发现:当弹带在坡膛挤压的初始段时,弹带和膛压对身管造成的变形程度几乎一样,但随弹丸向炮口运动,弹带对身管变形程度的影响逐渐高于膛压对身管变形的影响;同时,比较了同一测试点处的膛压数据,作出弹丸沿身管运动时身管各点的应变曲线,并推导出身管各点对应的膛压大小;借助应变曲线的起始与终止点时间间隔和弹带宽度,推算弹丸在身管内瞬时运动速度;模拟弹丸经过身管时,身管各点的应变曲线,可供火炮身管的动态测试和受力分析参考。

The lightweight seatless gun adopts a composite barrel(metal lining+wound carbon fiber)to achieve lighter barrel.Due to the thin barrel wall thickness and complex mechanical properties,and the dual role of belt and chamber pressure,the transient state of the barrel was deeply discussed.The deformation mechanism under force has important theoretical significance and practical application value for the lightweight design of the barrel.For the composite barrel of a lightweight recoilless gun,the hoop dynamic strain test was carried out on different positions of the barrel.The test found that:when the belt is in the initial stage of squeeze,the deformation of the barrel caused by the belt and the chamber pressure is almost the same,but as the projectile moves toward the muzzle,the degree of deformation of the barrel by the belt is gradually higher based on the deformation of the barrel caused by the bore pressure;at the same time,the bore pressure data at the same test point was used for comparison,and the strain change state curve of each point of the barrel at different times was obtained when the projectile moves along the barrel.In the case of a fixed design,the corresponding bore pressure at each point of the barrel was derived;with the aid of the time interval between the start and end points of the strain test curve and the width of the belt,the instantaneous velocity curve of the projectile in the barrel was calculated;the projectile was simulated passing through the barrel.The strain animation curve of each point of the barrel changes with time,which provides a technical way for the dynamic test and deformation analysis of the artillery barrel.