| 海洋平台焊接接头低温疲劳裂纹扩展速率研究 |
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| 引用本文： | 贾星兰,方华灿.海洋平台焊接接头低温疲劳裂纹扩展速率研究[J].石油机械,1997,25(4):18-20. |
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| 作者姓名： | 贾星兰 方华灿 |
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| 作者单位： | 华东石油大学!山东省东营市257062(贾星兰)，石油大学!北京(方华灿) |
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| 基金项目： | 中国海洋石油总公司资助 |
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| 摘 要： | 针对海洋平台在交变载荷作用下的低温疲劳问题，对焊接接头处的低温疲劳裂纹扩展速率（da／dN）进行了研究。试样所用材料为海洋平台用钢ASTMA131，试样焊接接头的焊接工艺与实际管节点焊接工艺相同。试样接头部位承受弯曲循环载荷，试验环境温度分别为－25℃和20℃。通过对试验数据的处理，得出了低温和室温下的两条da／dN－ΔK曲线。结果表明，两曲线有一交点ΔKp，当应力强度因子幅值ΔK＜ΔKp时，低温环境下试样的da／dN低于室温，结构物偏于安全；当ΔK＞ΔKp时，低温环境下试样的da／dN大于室温，结构物偏于危险。
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| 关 键 词： | 海上平台 焊接接头 低温疲劳 裂纹 扩展速率 |
Extension rate of lowtemperature fatigue crack on welded joint of offshore platform |
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| Jia Xinglan.Extension rate of lowtemperature fatigue crack on welded joint of offshore platform[J].China Petroleum Machinery,1997,25(4):18-20. |
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| Authors: | Jia Xinglan |
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| Abstract: | In the light of the low-temperature fatigue of offshore Platforms under the action of alternating load, the extension rate (da/dN)of the low-temperature fatigue crack on welded joints is investigated. ASTM A13l steel for offshore Platform is used as the material for the test specimen. Cycling bending load is exerted on the joints of the specimen. The test is conducted at low temperature(-25℃) and room temperature(20℃) respectively. Two da/dN - Δk curves are obtained by processing of the test data, and they have a intersection point ΔKp. When the amplitude of the stress intensity factor Δk<Δkp, da/dN of the specimen at low temperature is lower than that at room temperature, the structure is safe; while Δk>Δkp, da/dN of the specimen at low temperature is higher than that at room temperature, the structure is dangerous. |
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| Keywords: | offshore platform welded joint low temperature fatigue crack extension rate |
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