弹粘塑性孔隙介质在冲击荷载作用下的一种本构关系——第二部分:弹粘塑性孔隙介质的畸变行为  

CONSTITUTIVE MODEL OF POROUS ELASTOVISCOPLASTIC MATERIALS SUBJECTED TO SHOCK ——PART II:DISTORSIONAL BEHAVIOR OF POROUS ELASTOVISCOPLASTIC MATERIALS

作　　者：戚承志[1] 王明洋[2] 钱七虎[3] 

机构地区：[1]北京建筑工程学院土木系,北京100044 [2]解放军理工大学,南京100038 [3]中国工程院土木水利与建筑学部,北京100038

出　　处：《岩石力学与工程学报》2003年第11期1763-1766,共4页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金(A50179038号);教育部回国留学人员启动基金(教外司留[1999]747号)资助项目。

摘　　要：继发表在本刊2003年第9期上第一部分的研究,就弹塑性孔隙介质在冲击偏应力张量作用下的行为进行了研究。考虑应变率对材料强度的影响,给出了热活化机理与宏观阻尼机理相互竞争的联合强度-应变率依赖模型。考虑应力状态、应变强化、畸变损伤和与孔隙率相联系的损伤对材料强度的影响,并在此基础上基于热活化原则给出了松弛型的应力偏量与应变偏量之间的关系,且本模型符合热力学第二定律。Continuing the study performed in the first part put in the issue 2003-9 of this journal,the second part of the paper researches the distorsional behavior of porous elastoviscoplastic materials subjected to shock. The influence of strain rate on material strength is considered,and a unified strain rate dependent strength model of competition between thermal activation mechanism and macro-viscosity mechanism is proposed. The influences of stress state,strain hardening,distorsional deformation damage,and damage related with porosity change are considered. And furthermore,on the basis of thermal activation mechanism,a relaxation type relation between distorsional stress tensor and distorsional strain tensor is given,and the model follows the second thermodynamic law.

关 键 词：岩石力学 弹粘塑性 孔隙介质 冲击荷载 本构关系 松弛型关系 

分 类 号：TU435[建筑科学—岩土工程]