端头带有质量块的悬臂梁在冲击载荷下的剪切失效

以飞射物撞击构件引起破坏为工程背景,研究端头带有质量块的悬臂梁受到冲击载荷作用后发生剪切失效的可能性。分析表明:在初始速度间断面上是否发生失效取决于无量纲初始动能和质量块尺寸与梁厚之比,而与梁的长度无关;质量块的转动惯量对于剪切失效具有不可忽略的影响。

SHEAR FAILURE OF A CANTILEVER WITH AN ATTACHED MASS BLOCK AT THE TIP UNDER IMPULSIVE LOADING

Related to the dynamic failure of structural members struck by projectiles,this paper studies the possibility of the shear failure of a cantilever beam with an attached mass block at the tip under impulsive loading. It is illustrated that whether a shear failure occurs at the interface, where the initial velocity has discontinuity, depends on the non-dimensional initial kinetic energy and the ratio of the size of the mass block to the thickness of the beam;and it is independent of the length of the beam. It is also shown that the influence of the rotary inertia of the mass block on the shear failure is not negligible.