延性金属动态拉伸断裂的损伤演化研究  

Damage evolution on dynamic tensile fracture of ductile metals

作　　者：彭辉[1] 裴晓阳[1] 陈实[1] 祁美兰[2,3] 柏劲松[1] 李平[1] 贺红亮[1] 

机构地区：[1]中国工程物理研究院流体物理研究所,冲击波物理与爆轰物理重点实验室,绵阳621900 [2]武汉理工大学理学院,武汉430070 [3]阿贡国家实验室先进光子源,美国芝加哥60439

出　　处：《中国科学：物理学、力学、天文学》2017年第7期2-12,共11页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：国家自然科学基金(编号:11302202,11532012);国家自然科学基金委员会与中国工程物理研究院联合基金(编号:U1330111);中国工程物理研究院院长基金(编号:201402084);冲击波物理与爆轰物理重点实验室基金(编号:9140C670301150C67290)资助项目

摘　　要：延性金属动态拉伸破坏(层裂)是跨空间尺度、跨时间、跨结构层次的多尺度耦合现象,是不可逆的、远离平衡的非线性演化过程,如何联系微观尺度上的损伤机制理解和宏观尺度上的破坏行为预测是当下学术界面临的挑战.本文结合课题组之前的工作,对延性金属动态拉伸断裂的宏观响应、损伤演化机理和物理模型构建的研究进展和现状进行了评述,从多个时空尺度对延性金属动态拉伸断裂进行全面介绍,并分析了延性金属动态拉伸断裂的跨尺度演化研究所面临的困难和挑战.Dynamic tensile failure, e.g. spallation, of ductile metals is a complex phenomenon, due to its multiple tempo-spatial scales and structural levels involved on one hand, and due to its irreversible and nonlinear features as a non-equilibrium process on the other. Activated/Stimulated by tensile stress, non-uniform mesoscopic structures of materials evolve, leading to internal damage nucleation, growth, coalescence and final fracture, which consist the basic physical processes of dynamic tensile failure of ductile metals. Damage evolution on dynamic tensile fracture of ductile metals has been reported elsewhere, however, our ability to understand the mechanism of damage evolution in micro-scale and to accurately predict fracture in macro-scale is still limited. In this paper, we present investigations on macroscopic response, microscopic mechanism and physical models of dynamic tensile failure, based on our previous works. Current difficulties and challenges encountered when studying such a complex, multi-scale phenomenon are also discussed.

关 键 词：延性金属 层裂 宏观响应 演化机理 物理模型 

分 类 号：O346.1[理学—固体力学]