基于等效能量原理的延性材料J(δ)阻力曲线测试新方法研究  

THE RESEARCH OF NEW TESTING METHOD FOR OBTAINING THE J(δ)RESISTANCE CURVES OF DUCTILE MATERIALS BASED ON EQUIVALENT ENERGY PRINCIPLE

作　　者：彭云强 蔡力勋 韦利明[1] PENG Yun-qiang;CAI Li-xun;WEI Li-ming(Institute of Systems Engineering,Chinese Academy of Engineering Physics,Mianyang,Sichuan 621999,China;Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province,School of Mechanics and Engineering,Southwest Jiaotong University,Chengdu,Sichuan 610031,China)

机构地区：[1]中国工程物理研究院总体工程研究所,四川绵阳621999 [2]西南交通大学力学与工程学院应用力学与结构安全四川省重点实验室,四川成都610031

出　　处：《工程力学》2020年第10期7-16,共10页Engineering Mechanics

基　　金：国家自然科学基金项目(1147228,11872320)。

摘　　要：基于等效能量原理获取的I型裂纹试样弹塑性载荷-位移关系和J积分-载荷关系半解析统一表达式,借助半解析法实现了对多种裂纹试样J阻力曲线的有效测试;采用该方法,还可很容易实现C型外缺口压缩(C-shaped outside edge-notched compression,COEC)小试样的高温J阻力曲线测试。此外,借助半解析公式确定的锐裂纹试样的实时裂纹扩展长度,亦可实现延性材料的裂尖张开位移(Crack tip opening displacement,CTOD,δ)阻力曲线测试。Based on the elasto-plastic semi-analytical expressions of load-displacement relation and J integralload relation for mode I cracks deduced from the equivalent energy principle,the J resistance curves of different components are successfully determined using the semi-analytical method.Furthermore,the J resistance curve of small C-shaped outside edge-notched compression(COEC)specimen at high temperature can also be obtained by the same method.According to the growing crack size of sharp cracked specimen determined by the semianalytical equation,the crack tip opening displacement(CTOD,δ)resistance curves of ductile materials can also be determined.

关 键 词：等效能量原理 延性材料 I型裂纹 半解析 阻力曲线 

分 类 号：TB303[一般工业技术—材料科学与工程]