摘要
现有的疲劳S-N曲线已不再适用于北极的低温环境,为了评估北极海洋工程设备材料的低温疲劳寿命,有必要建立金属结构尤其是焊接结构的低温疲劳S-N曲线。本文基于等效结构应力法,计算出Q690高强钢管环焊缝的主S-N曲线,并通过共振疲劳试验对该方法进行了验证。在此基础上,结合大量的高强钢焊接结构试验结果,将温度敏感因子c引入到低温疲劳主S-N曲线的推导中,首次建立了基于低温金属焊接结构的主S-N曲线,并对文献中的疲劳S-N试验数据和ASME中的修正方法进行了对比和验证。结果表明,等效结构应力法能够较准确地计算出焊缝疲劳S-N曲线,推导出的金属焊接结构低温主S-N曲线与试验曲线吻合较好,能够满足低温地区工程要求,可为高强钢焊接结构在北极地区低温环境中的广泛应用提供理论指导。该方法可以为金属焊接结构的低温疲劳研究节省大量的成本,减少非标准试验操作造成的不必要的误差。这对北极海洋工程设备的设计、安全运行和疲劳评估具有重要意义。
The existing fatigue S-N curves are no longer applicable to the low-temperature environment in the Arctic regions.In order to evaluate the low-temperature fatigue life of Arctic offshore engineering equip‐ment,it is necessary to establish the low-temperature fatigue S-N curves of metal structures,especially weld‐ed structures.In this paper,based on the equivalent structural stress method,the master S-N curve of the girth weld of Q690 high strength steel pipes was calculated,and the method was verified by resonance fatigue test.On this basis,combined with a large number of test results of high-strength steel welded structures,the temperature sensitive factor c was introduced into the derivation of the low-temperature fatigue master S-N curve.The master S-N curve based on low-temperature metal welded structures was established for the first time,and the fatigue S-N test data in the literature and the correction method in ASME were compared and verified.The results show that the equivalent structural stress method can accurately calculate the weld fa‐tigue S-N curve,and the derived low-temperature main S-N curve of metal welded structures is in good agreement with the test curve,which can meet the engineering requirements in low-temperature areas,and provide theoretical guidance for the wide application of high-strength steel welded structures in low-temper‐ature environments in the Arctic regions.This method can save a lot of costs for the low temperature fatigue research of metal welded structures and reduce unnecessary errors caused by non-standard test operations.This research is of great significance to the design,safe operation and fatigue assessment of Arctic offshore engineering equipment.
作者
高杰
鞠晓臣
左照坤
赵欣欣
段梦兰
GAO Jie;JU Xiao-chen;ZUO Zhao-kun;ZHAO Xin-xin;DUAN Meng-lan(Railway Engineering Research Institute,China Academy of Railway Sciences Co.Ltd.,Beijing 100081,China;Instrumentation Technology and Economy Institute,Beijing 100055,China;College of Safety and Ocean Engineering,China University of Petroleum(Beijing),Beijing 102249,China)
出处
《船舶力学》
EI
CSCD
北大核心
2024年第4期571-581,共11页
Journal of Ship Mechanics
基金
中国铁道科学研究院集团有限公司国家创新平台开放基金(2021YJ167)
国家自然科学基金资助项目(U1934209)
国家重点研发计划项目(2017YFB0304805)。
关键词
等效结构应力法
焊接结构
低温主S-N曲线
温度敏感系数
equivalent structural stress method
welded structure
low-temperature master S-N curve
temperature sensitive factor
