论层裂强度(英文)  

On Spall Strength

作　　者：陈大年[1] 俞宇颖[1] 尹志华[1] 王焕然[1] 刘国庆[1] 

机构地区：[1]宁波大学力学与材料科学研究中心,浙江宁波315211

出　　处：《宁波大学学报（理工版）》2003年第4期434-441,共8页Journal of Ningbo University：Natural Science and Engineering Edition

基　　金：The project is supported by the Notional Nature Science Foundation of China(10272058);Provincial Nature Science Foundation of Zhejiang(502167;Sci.and Tech.Ftmds of China Academy of Engineering Physics(CAEP)

摘　　要：讨论了层裂强度的理论预估及经验确定.指出,平面冲击波致层裂试验的试件自由面速度或界面应力历史的实验最小值与损伤演化过程有关.数值模拟揭示,层裂面上的损伤演化严重影响层裂碎片中的波剖面传播.因此,平面层裂试验的“拉回”信号必须赋予新的解释。层裂强度的实验确定必须涉及层裂过程中的损伤演化.Theoretical prediction and empirical determination of spall strength are discussed. It is noted that the experimental minimum of free surface velocity or interface stress history of a sample loaded by a plane shock wave is connected with the damage evolution process. It is revealed that the propagation of wave profile in the spall scab is affected seriously by the damage evolution on the spall plane. Therefore, it appears that a new interpretation of the origin of the pull-back signal in planar spall experiments is required and the instrumental determination of spall strength should be involved in the damage evolution in the spall process.

关 键 词：层裂强度 损伤演化 实验确定 数值模拟 平面冲击波 自由面速度 界面应力 

分 类 号：O346.1[理学—固体力学]