二次边界载荷下脆性材料动态拉伸承载能力

The Dynamic Load-Carrying Capacity of Brittle Materials Under Quadric Boundary Loading

结合有限结构-时间准则,得到了二次边界载荷下脆性材料动态拉伸承载能力的解析表达式.分析说明:脆性材料的动态拉伸承载能力可以由外载荷的特征和材料的准静态材料参数相互作用完全决定,因此脆性材料动态强度的应变率效应并不是材料的内禀性质.此外,不同的外部载荷所导致的材料动态拉伸承载能力有所不同,这是以前动态实验数据中具有内在离散特性的原因.

An analytic expression for dynamic tensile load-carrying capacity of brittle materialsunder quadric boundary loading was derived together with a finite structural-temporal criterion.The analysis demonstrates that the dynamic tensile load-carrying capacity of brittle materials canbe determined by interaction between the exterior loading conditions and the quasistaticparameters, and the strain rate effect on the dynamic tensile strength of brittle materials is notthe intrinsic property of materials. In addition, the difference of dynamic load-carrying capacity isdue to the different exterior loading, which is the reason that leads to the intrinsic scatter natureof previous dynamic experimental data.