时间相关的含缺陷材料的流变破坏理论(英文)  

The Rheo - Failure Theory of Time - Dependent Materials Containing Defects

作　　者：袁龙蔚[1] 

机构地区：[1]湘潭大学基础力学与材料工程研究所,湖南湘潭411105

出　　处：《湘潭大学自然科学学报》2003年第4期1-21,共21页Natural Science Journal of Xiangtan University

基　　金：Project Supported by National Natural Science Foundation of China(10172073)

摘　　要：含缺陷物体的与时间相关的失效过程是一个热力学开放的,远离平衡态的系统,失效过程中发生耗散结构的自组织现象.不同尺度上耗散结构的自相似性可供从微观过度到细观和宏观.基于缺陷演化过程中局域温度场和热磁效应的实验研究,从统一的宏、细、微观层次体系出发,研究了与时间相关的缺陷体的失效过程.结果表明,这个失效过程并非纯力学过程,其中的热力耦合和热磁效应不容忽略.The failure process of time - dependent material containing defects may be considered as a thermodynami-cally open, far - from - equilibrium system in which the self - organization of dissipative structures takes place. The self - similarity of dissipative structures on different scaling levels provides the opportunity for transition from micro - to meso and macro - levels. In this paper, based on the experimental results of local temperature field and pyromagnetic effect formed in the evolution period of defects, the failure process of time - dependent material containing defects have been studied from a unified standpoint of macro - /meso - /microscopic stratum system. It is proved that this failure process is not only a pure mechanical process, the thermo - mechanical coupling effect and pyromagnetic effect are not negligible.

关 键 词：流变失效理沦 层次体系 本构方程 序参量 裂尖过程区 局域温度场 热磁效应 原子间配位势 热力耦合效应 热-电磁耦合效应 流变行为 

分 类 号：O341[理学—固体力学]