刘红波, 赵昱, 张金凤, 李志国, 赵海龙
AuthorsHTML:刘红波, 赵昱, 张金凤, 李志国, 赵海龙
AuthorsListE:Liu Hongbo, Zhao Yu, Zhang Jinfeng, Li Zhiguo, Zhao Hailong
AuthorsHTMLE:Liu Hongbo, Zhao Yu, Zhang Jinfeng, Li Zhiguo, Zhao Hailong
Unit:天津大学建筑工程学院，天津 300072
Unit_EngLish:School of Civil Engineering, Tianjin University, Tianjin 300072, China
Abstract_Chinese:为了研究海洋平台中焊接节点的低周疲劳性能, 设计了海洋用钢DH36钢的标准拉伸试件和角焊缝试件, 进行材料性能和节点静力拉伸实验; 其次进行铜加速乙酸盐雾实验, 并将其当量折算为海洋环境谱作用, 完成非腐蚀和腐蚀节点试件的对照低周疲劳实验, 得到节点试件疲劳性能; 通过ABAQUS与FRANC3D的交互, 针对角焊缝试件的3种初始裂纹进行裂纹扩展模拟, 提出疲劳寿命评估方法. 研究结果表明：焊接缺陷比短期腐蚀作用对试件疲劳寿命的影响更大; 采用焊根双边贯穿裂纹计算角焊缝试件低周疲劳寿命, 具有较高的可靠性.
Abstract_English:To study low-cycle fatigue properties of welded joints in jacket platform，DH36 steel standard tensile specimens and fillet weld specimens were designed and uniaxial tensile tests were conducted. The copper-accelerated acetic acid-salt spray tests(CASS)were completed and a conversion was made for equal effect of marine environmental spectrum. The controlled low-cycle fatigue tests on non-corrosion and corrosion specimens were performed to acquire the fatigue properties of welded joints. Based on ABAQUS and FRANC3D interaction platform，three kinds of initial fatigue cracks were imported into the fillet weld specimen model to estimate fatigue life. The results indicate that weld defects have a greater impact on fatigue life than short-term corrosion; it is of high reliability to adopt weld root penetration cracks in estimating the low-cycle fatigue life of fillet weld specimens.
Keyword_Chinese:焊接节点; 低周疲劳; 盐雾实验; FRANC3D; 断裂力学; 疲劳裂纹
Keywords_English:welded joint; low-cycle fatigue; salt spray test; FRANC3D; fracture mechanics; fatigue crack

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