东南大学学报（自然科学版）2016，Vol.46Issue(6)：1257-1263,7.DOI:10.3969/j.issn.1001-0505.2016.06.025
考虑点蚀损伤的锈蚀钢板延性退化
Ductility degradation of corroded steel plates with pitting damage
摘要
Abstract
To investigate the mechanism of ductility degradation of the steel plates with pitting dam-age,the pitting geometric parameters on the surface of the steel plates with different corrosion de-grees were tested by three-dimensional (3 D)profile measurement technology,and the effects of pit-ting damage on the ductility of steel plates were studied by the monotonic tensile tests and finite ele-ment numerical analysis.In addition,the equivalent ductile fracture criterion of the steel plates with pitting damage related to the pitting geometric parameters was proposed based on the relationships be-tween the stress triaxiality and the pitting depth,the pitting distance,and the depth-radius ratio.The results show that both the pitting depth and the pitting depth-radius ratio increase linearly with the in-crease of the corrosion degree.The increase of the geometric dimension of the pits changes the mag-nitude and the distribution of the triaxial stress of the steel plates significantly,reduces the critical equivalent plastic strain,and accelerates the initiation and propagation of the cracks at the necking stage,inducing the gradual degradation of the ultimate elongation of the corroded steel plates.The ductility degradation of steel plates caused by pitting damage can be accurately simulated by the equivalent ductile fracture criterion.关键词
点蚀损伤钢板/延性退化/点蚀坑几何参数/应力三轴度/等效延性断裂准则Key words
steel plates with pitting damage/ductility degradation/pitting geometric parameters/stress triaxiality/equivalent ductile fracture criterion分类
建筑与水利引用本文复制引用
徐善华,王皓,苏磊,薛奇峰..考虑点蚀损伤的锈蚀钢板延性退化[J].东南大学学报（自然科学版）,2016,46(6):1257-1263,7.基金项目
国家自然科学基金资助项目（51378417）、国家重点研发计划资助项目（2016YFC0701305）． （）
