结构抗冲击设计的泰勒理论修正及计算机模拟

The modified Taylor theory and simulation by computer in the design of structure under the impact load

结构在冲击荷载作用下其材料的屈服强度提高,弹靶碰撞可用来确定材料的动屈服强度。本文提出了一种新的弹靶接触面积增长模型——阻滞增长模型,该模型假设接触面积的增长率为接触面积的减函数,并采用该模型对经典的弹靶撞击理论——Taylor理论,进行了修正。与Taylor理论和钱伟长修正理论相比,本文的理论更符合实际,并与有限元结果一致。

The dynamic yield stress of the material get higher when the structure is under the impact load. Taylor＇s theory is a projectile-target impacting theory, which is used to measure the dynamic yield strength of materials. Because of the reasonless hypothesis of area increase model of interface between the projectile and target, there is large difference between the results of test and forecast. A new area increase model of interface between the projectile and target——preventing area increase model bring forward in this paper. It hypothesized that the interface area＇s increasing acceleration was the interface area＇s decreasing function. Then the classical strike theory——Taylor＇s theory was modified under this hypothesis. Comparing with the Taylor＇s theory and the QIAN Weichang＇s theory, the model in this paper was most up to fact.