摘要
以X65管线钢为研究对象,采用有限元方法(FEM)分析了不同深度和不同直径的平底型腐蚀缺陷对管线钢局部应力应变分布和剩余强度的影响规律,并通过实验方法进行了验证。结果表明,腐蚀缺陷深度愈大,剩余强度愈低;腐蚀缺陷直径愈大,剩余强度愈低,并且缺陷深度比缺陷直径对剩余强度的影响更为显著。采用拉伸实验方法,对直径为6 mm,深度分别为1/2壁厚和1/4壁厚的平底型腐蚀缺陷模拟试样进行实验验证,结果与FEM求解结果较为一致,尤其是含有大深度缺陷试样的实验结果同有限元计算结果的一致性更好。
In order to reveal the influence of the defects size on the load capacity of a corroded line pipe of X65 steel, the distribution of the von Mises stress and strain as well as the relation of the residual strength of the line pipe with the depth and diameter of the flat bottom defects were analyzed by the finite element methods （FEM）, meanwhile, the lab experiment was carried out to verify the calculated results. The results showed that, the deeper of the corroded defects, as well as the bigger the diameter of the defects, the less residual strength was, and the depth exhibited much significant influence than the diameter. Tensile tests were carried out for the specimens with flat bottom defects of 6 mm in diameter and of 0.25t （t, thickness）and 0.St in depth respectively, it follows that the experimental results were coincident to those of calculated by FEM, especially that of the specimen with the bigger defect depth.
出处
《中国腐蚀与防护学报》
CAS
CSCD
北大核心
2013年第4期339-346,共8页
Journal of Chinese Society For Corrosion and Protection
基金
国家自然科学基金项目(51101127和51171154)资助
关键词
平底型腐蚀缺陷
剩余强度
有限元分析
实验验证
flat bottom defect
residual strength
finite elements analysis
experimental verification
