摘要
为了快速方便地估算裂纹尖端的塑性区尺寸,以承受双向均匀拉伸的含有中心穿透裂纹的有限平板模型为研究对象,提出了一种基于裂纹最大张口位移确定硬化材料裂尖塑性区尺寸的简便方法.该方法以理想弹塑性材料提出的裂纹最大张口位移与裂尖塑性区尺寸间的函数关系为基础,考虑了材料硬化特性的影响,提出了仅与应变硬化指数相关的修正系数表达式,建立了不同外加载荷作用下基于裂纹最大张口位移确定硬化材料裂尖塑性区尺寸的简便方法,并分析了不同裂纹长度和不同屈服极限条件下方法的适用性.研究结果表明:该方法能够消除裂纹长度、屈服极限和外加载荷等参数的影响,适用于任意材料的有限平板模型.
To quickly and easily estimate crack-tip plastic zone, a new method was proposed to calcu- late crack-tip plastic zone of hardened materials based on maximum crack opening displacement （MCOD） for the central through cracked finite plate model subjected to biaxial uniform tension loads. On the basis of the obtained relationship between the crack-tip plastic zone and the MCOD for the e- lastic-perfectly plastic material, the influence of the hardened material characteristics was considered. The function expression of modified coefficient only related to strain hardening exponent was presen- ted. The simple method to estimate crack-tip plastic zone of hardened material by the MCOD was es- tablished, and the effects of crack length and yield stress on this method were analyzed. This method can eliminate the effects of crack length, yield stress and applied load, and be suitable for the finite models of arbitrary materials.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第12期101-105,共5页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金青年基金资助项目(51209035)
中国博士后科学基金资助项目(2012M511150)
关键词
裂纹最大张口位移
中心穿透裂纹
裂尖塑性区尺寸
应变硬化指数
修正系数
maximum crack opening displacement
center through crack
crack-tip plastic zone
strainhardening exponent
modified coefficient
作者简介
陈景杰（1980-），女，博士，E—mail：chenjingjie@dlut．edu．cn
