(1. 北京航空航天大學 固體力學研究所, 北京 100083;
2. 中南大學 資環(huán)建學院， 長沙 410083)
摘 要: 剪切失效是強動載荷作用下結構失效的重要模式。著重研究了自由梁在中點受到質量塊撞擊后的剪切效應，給出了發(fā)生剪切失效的無量綱判據(jù)。分析表明，在初始速度的間斷界面上是否發(fā)生剪切失效取決于質量塊無量綱初始動能、質量比及梁的無量綱厚度。
關鍵字: 自由梁； 撞擊； 剪切失效
by projectile at mid-span
（1. Solid Mechanics Research Center，
Beijing University of Aeronautics and Astronautics，Beijing 100083，P.R.China;
2. College of Resources，Environment and Civil Engineering，
Central South University，Changsha 410083, P.R.China）
Abstract:Shear failure is an important mode of dynamic failure of structural members under impulsive loading. Shear effect of a free-free beam subjected to impact by a projectle at the mid-span was studied and the non-dimensional criterion of the shear failure was presented. It was illustrated that whether a shear failure occurs at the interface，where the initial velocity has discontinuity，depends on the initial kinetic energy of the projectile，the mass ratio and the non-dimensional thickness of the beam.
Key words: free-free beam； impact； shear effect
