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| 平台钢焊接接头在海洋中的腐蚀疲劳研究 |
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李言涛1, 侯保荣1, 薛以年2
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1.中国科学院海洋研究所;2.中国科学院力学研究所
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| 摘要: |
| 随着近海石油开采事业的迅猛发展,我国已自行设计和建造了许多固定式导管架钢结构海上平台,它们在海洋环境中承受着波浪引起的交变载荷作用,与惰性环境中承受交变载荷条件下得到的疲劳结果相比,交变载荷与侵蚀性环境的联合作用往往导致疲劳性能显著下降。这种损伤可能是疲劳开裂和腐蚀性破坏的简单叠加,也可能是这两者之间某些更为复杂的协同交互作用的结果(贾斯克,1989)。钢结构海上平台是由钢构件(如钢管、钢板、角钢等)焊接而成,海水腐蚀疲劳裂缝大都产生于焊缝区的焊趾处,该部位存在焊接残余应力,以及焊接缺陷和儿何缺陷,形成应力集中。本文通过对海上平台用钢板在空气中、海水中和海水中有阴极保护三种条件下腐蚀疲劳性能的研究,探讨了钢材在海上平台不同部位、不同保护状况下的腐蚀疲劳寿命,为海上采油平台设计与选择提供了理论依据。 |
| 关键词: 钢焊接接头、腐蚀疲劳 |
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| 基金项目:中国科学院海洋研究所调查研究报告第2893号 |
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| CORROSION FATIGUE OF WELDED STEEL JOINTS IN SEAWATER |
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Li Yantao1, Hou Baorong1, Xue Yinian2
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1.Institute of Oceanology,Chinese Academy of Sciences;2.Institute of Mechanics, Chinese Academy of Sciences
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| Abstract: |
| Experiments on the corrosion fatigue of welded steel joints in air and seawater, and in seawater with cathodic protection, yielded bata for linear regression to obtain fatigue-life curves(?S-Nf). The laws of corroion fatigue in welded joints of test steel are discussed with referrence to those of A587 and A131 steels there. In the expriments above, the fatigue damage occurring at all welded joints around the weld bead resulted in the cracking and fracture there. The fatigue life of the speciments in seawater was longer than that in seawater, almost reaching the length of the fatigue life in air. |
| Key words: WELDED STEEL JOINTS,CORROSION FATIGUE |
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