Building P-S-N Curves of Weld Metal of Spiral Submerge-Arc Welded X70 Steel Pipe
摘 要
通过对螺旋埋弧焊接X70钢管焊缝金属进行疲劳试验, 得到了不同应力幅和应力比下的疲劳寿命数据, 对疲劳寿命的概率分布进行了分析; 依据当量疲劳寿命公式, 获得疲劳抗力系数和当量疲劳极限, 并对其概率分布进行分析, 进而建立了焊缝金属的P-S-N曲线, 给出了指定存活率下的疲劳寿命曲线。结果表明: 焊缝金属的疲劳寿命服从对数正态分布, 疲劳抗力系数服从对数正态分布, 以当量应力表示的疲劳极限服从正态分布。
Abstract
Fatigue tests were conducted on weld metal specimens cut from spiral submerge-arc welded X70 steel pipe. Fatigue life data at different stress amplitudes and stress rations were obtained. The probability distribution of these data was analyzed. Based on the equivalent fatigue life formula, values of fatigue resistant coefficient and equivalent fatigue limit were obtained and their probability distribution were also analyzed. The P-S-N curves of weld metal were built up. Fatigue life curves at given survivability were given. The results show that fatigue life of weld metal follows 1ogarithmic normal distribution, fatigue resistant coefficient follows logarithmic distribution and equivalent fatigue limit follows normal distribution.
中图分类号 TG113.2 DOI 10.11973/jxgccl201607013
所属栏目 物理模拟与数值模拟
基金项目 陕西省教育厅专项科研计划资助项目(15JK1577)
收稿日期 2015/5/11
修改稿日期 2016/4/1
网络出版日期
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备注郑新侠(1963-), 女, 陕西咸阳人, 副教授, 学士。
引用该论文: ZHENG Xin-xia,LUO She-ji. Building P-S-N Curves of Weld Metal of Spiral Submerge-Arc Welded X70 Steel Pipe[J]. Materials for mechancial engineering, 2016, 40(7): 56~59
郑新侠,雒设计. 螺旋埋弧焊接X70钢管焊缝金属P-S-N曲线的建立[J]. 机械工程材料, 2016, 40(7): 56~59
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参考文献
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【3】马少华, 回丽, 许良, 等. 空气环境对预腐蚀2XXX系列铝合金疲劳性能的影响[J]. 机械工程材料, 2015, 39(3): 65-70.
【4】PINHEIRO B D C, PASQUALINO I P. Fatigue analysis of damaged steel pipelines under cyclic internal pressure[J]. International Journal of Fatigue, 2009, 31(5): 962-973.
【5】钟勇, 单以银, 霍春勇, 等.管线钢疲劳特性研究进展[J].材料导报, 2003, 17(8): 11-15.
【6】李少华, 曾燕屏, 仝珂.疲劳载荷作用下X80管线钢夹杂物的微观行为[J].石油学报, 2012, 33(3): 506-512.
【7】陈平伟, 王峰会, 鲁婷婷, 等.服役条件下螺旋焊接管线钢疲劳裂纹扩展机理分析[J].理化检验-物理分册, 2010, 46(11): 682-704.
【8】钟勇, 肖福仁, 单以银, 等.管线钢疲劳裂纹扩展速率与疲劳寿命关系的研究[J].金属学报, 2005, 41(5): 523-528.
【9】FAZZINI P G, BELMONTE J E, CHAPETTI M D, et al.Fatigue assessment of a double submerged arc welded gas pipeline[J].International Journal of Fatigue, 2007, 29(6): 1115-1124.
【10】郑修麟. 金属疲劳的定量理论[M]. 西安: 西北工业大学出版社, 1994.
【11】TANAKA T.Data-base on fatigue strength and statistical distribution characteristics of fatigue life and fatigue strength[C]∥Proceeding of the 2nd Internationnal Fatigue Conference.[S.l.]: [s.n.], 1984: 323-341.
【12】ZHENG X L, L B, JIANG H. Determination of probability distribution of fatigue strength and expressions of P-S-N curves[J]. Engineering Fracture Mechanics, 1995, 50(4): 483-491.
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