摘要
采用取自足尺度海底管道16 Mn钢制成的标准紧凑拉伸(CT)试件进行了疲劳裂纹扩展试验,利用背面应变法测量了疲劳裂纹扩展过程,并研究了取材方向和试验环境因素对疲劳裂纹扩展速率的影响,拟合出了不同取材方向与不同试验环境下Paris常数C和m。研究结果表明:试件材料取材方向对疲劳裂纹扩展初始阶段有一定影响,但对总体疲劳裂纹扩展趋势基本无影响;海水环境对疲劳裂纹扩展影响显著,且海水中疲劳裂纹扩展速率约为空气中的2倍。本文研究结果不仅可以定量分析16 Mn钢在海水腐蚀环境下与空气环境下疲劳裂纹扩展速率的差异,且能为后续基于Paris公式来预测管道腐蚀疲劳寿命的研究提供基本参数,为服役中的海底管道腐蚀疲劳问题的研究提供参考。
The fatigue crack growth test was carried out with the standard compact tensile(CT)specimens made of 16 Mn steel from the full-scale submarine pipelines.The fatigue crack growth process was measured with the back strain method,the influences of sampling direction and test environments on fatigue crack growth rate were studied,and the Paris constants C and m under different sampling direction and test environments were fitted.The results show that the sampling direction of specimen has a certain influence on the initial stage of fatigue crack growth,but has little effect on the overall fatigue crack growth trend;the seawater environment has a significant effect on the fatigue crack growth,and the rate of fatigue crack growth in seawater is about 2 times the rate in the air.The results of this paper can not only quantitatively analyze the difference on the fatigue crack growth rate of 16 Mn steel in seawater corrosive environment and in the air,but also provide basic parameters for the follow-up study on prediction of pipelines corrosion fatigue life based on Paris formula,thus providing reference for the study on the corrosion fatigue problems of submarine pipelines in service.
作者
张衡镜
邵永波
杨冬平
ZHANG Hengjing;SHAO Yongbo;YANG Dongping(School of Mechatronics Engineering,Southwest Petroleum University,Chengdu,Sichuan 610500,China;Sinopec Shengli Oil Company,Dongying,Shandong 257062,China)
出处
《中国海上油气》
CAS
CSCD
北大核心
2018年第6期158-163,共6页
China Offshore Oil and Gas
基金
国家重点研发计划"临海油气管道及陆上终端风险评估及防控技术(编号:2016YFC0802305)"部分研究成果
作者简介
第一作者简介:张衡镜,男,硕士研究生,主要从事动力工程与工程热物理方面的研究工作。地址:四川省成都市新都区新都大道8号(邮编:610500)。E-mail:201521000540@stu.swpu.edu.cn。
