含平底型腐蚀缺陷钢管剩余强度的有限元求解和试验验证-科学学研究.pdfVIP

第33 卷 第4 期 中国腐蚀与防护学报 Vol. 33 No. 4 2013 年8 月 Journal of Chinese Society for Corrosion and Protection Aug. 2013 含平底型腐蚀缺陷钢管剩余强度的有限元求解 和实验验证 杨专钊 刘道新 张晓化 西北工业大学航空学院 西安 710072 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。 关键词：平底型腐蚀缺陷 剩余强度 有限元分析 实验验证 中图分类号：TB304 文献标识码：A 文章编号：1005-4537(2013)04-0339-08 Finite Elements Analysis and Experimental Verification of Residual Strength of Steel Pipe with Flat Bottom Corrosion Defect YANG Zhuanzhao, LIU Daoxin, ZHANG Xiaohua School of Aeronautics ，Northwestern Polytechnical University, Xian, 710072, China Abstract: 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, thi