Ductility degradation of corroded steel plates with pitting damage

被引：0
|
作者：
Xu S. [1 ]
Wang H. [1 ]
Su L. [1 ]
Xue Q. [1 ]
机构：
[1] School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an
来源：
Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | 2016年 / 46卷 / 06期
关键词：
Ductility degradation; Equivalent ductile fracture criterion; Pitting geometric parameters; Steel plates with pitting damage; Stress triaxiality;
D O I：
10.3969/j.issn.1001-0505.2016.06.025
中图分类号：
学科分类号：
摘要：
To investigate the mechanism of ductility degradation of the steel plates with pitting damage, the pitting geometric parameters on the surface of the steel plates with different corrosion degrees were tested by three-dimensional (3D) profile measurement technology, and the effects of pitting damage on the ductility of steel plates were studied by the monotonic tensile tests and finite element 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 between 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 increase of the corrosion degree. The increase of the geometric dimension of the pits changes the magnitude 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. © 2016, Editorial Department of Journal of Southeast University. All right reserved.
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页码：1257 / 1263
页数：6
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