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

作　　者：严成[1] 欧卓成[1] 段卓平[1] 皮爱国[1] 黄风雷[1] 

机构地区：[1]北京理工大学爆炸科学与技术国家重点实验室,北京100081

出　　处：《北京理工大学学报》2015年第8期782-786,共5页Transactions of Beijing Institute of Technology

基　　金：国家自然科学基金资助项目(11221202);北京理工大学爆炸科学与技术国家重点实验室自主课题(YBKT-0905)

摘　　要：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.

关 键 词：动态拉伸承载能力 脆性材料 应变率效应 内禀性质 破坏准则 

分 类 号：O346.1[理学—固体力学]