摘要
基于刚性转动假设和功等效原理,推导了直通型CT试样的裂纹嘴张开位移和加载线张开位移弹塑性换算公式,并采用Cr2Ni2MoV钢对公式进行试验验证.根据弹塑性有限元分析,刚性转动假设得到了很好的验证,刚性转动中心靠近裂尖位置且受材料本构关系的影响甚微,转动半径R仅与裂纹长度和试样宽度之比a/W有关.有限元分析和试验结果表明,直通型CT试样的COD弹塑性换算公式用于塑性功计算具有更好的精度.
A elastic-plastic transform formula between crack mouth opening displacement and loading-line crack opening displacement（COD） for straight-notched compact tension（CT） specimens was deduced on the basis of the rigid rotation hypothesis and the work equivalence principle.Cr2Ni2MoV steel was employed to verify the validity of this formula experimentally.As a result of elastic-plastic finite element analysis,the rigid rotation assumption is completely proved.The rotation center of a straight-notched CT specimen is near the crack tip,and has little effect on the material constitutive relationship;consequently,the rotation radius R of the specimen is only related to the ratio of crack length a to specimen width W.The finite element analyses and experiments indicate that more accurate results of plastic work for straight-notched CT specimens may be obtained if using the elastic-plastic COD transform formula.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2011年第7期863-867,共5页
Journal of University of Science and Technology Beijing
基金
国家自然科学基金资助项目(No.11072205)
关键词
断裂力学
断裂韧性
韧性断裂
塑性变形
有限元法
fracture mechanics
fracture toughness
ductile fracture
plastic deformation
finite element method
