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.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
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。
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
rock mechanics,distorsional behavior,rate dependence,stress state,strain hardening,relaxation type relation
