用动态光弹性法研究炮身膛线的脱落问题

本文利用动态光弹性法研究了炮膛膛线脱落的机理。用包含五条膛线的部分炮筒横截面或扇形平面模型,在六种不同的载荷状态下进行了实验。得到了不同载荷状态下,不同瞬时的等差线条纹图的系列照片,以及膛线根部不同瞬时的应力分布曲线。结果表明:当一条或相邻数条膛线顶端受到足够大的均布冲击载荷时,将在承载膛线两侧根部的应力极值点出现膛线脱落的起裂点,而形成八字形脱落;而对非均布的其它几种冲击载荷,膛线都不会出现八字形脱落。

Dynamic Photoelastic Study of Barrel Rifle Peeling off

In order to expose the mechanism of rifle peeling off, the instantaneous stress distribution at root parts of rifle is studied by dynamic photoelastic technique A ring sector plane model with five rifles is selected for experiment simulate a portion of barrel cross-section. In experiments, manifold loading states are chosen to apply on one or three rifles. Results show that: When the top of one or several neighboring rifles is subjected to big enough uniformly distributed slock load, the stress concentrated points at both sides of a rifle root become the starting points of peeling-off and the peeling crack is symmetric, However the rifle will not peel off this way if the shock load is not uniformly distributed.