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首页> 外文期刊>Fatigue & Fracture of Engineering Materials & Structures >Fatigue crack propagation for Q345qD bridge steel and its butt welds at low temperatures
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Fatigue crack propagation for Q345qD bridge steel and its butt welds at low temperatures

机译：Q345qD桥梁钢及其对接焊缝在低温下的疲劳裂纹扩展

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摘要

Steel bridges fabricated with Q345qD steels face critical challenges when operating in cold regions with a low ambient temperature. This study aims to investigate, via an experimental program, the low-temperature fatigue crack propagation behavior of Q345qD bridge steel base material and its butt welds. The testing program comprises a series of Charpy impact tests and fatigue crack propagation tests at the room temperature, -20℃ and -60℃. The experimental results demonstrate a reduced crack propagation rate in the base material, but an increasing crack propagation rate in the butt welds, with a decreasing ambient temperature. The base material also shows enhanced fatigue crack propagation thresholds with the decreasing temperature. The ductile-to-brittle transition temperature for fatigue is lower than that for fracture in the base material while the weld metal exhibits an opposite trend. Generally, the butt welds present higher resistance against fatigue crack propagation and larger Charpy toughness values than do the base material at all tested temperatures. The Paris-law parameters measured at the room temperature for the base material leads to a conservative assessment of the crack propagation life for a welded joint under a low ambient temperature.
机译：在环境温度低的寒冷地区运行时，用Q345qD钢制成的钢桥面临严峻的挑战。本研究旨在通过实验程序研究Q345qD桥梁钢基材及其对接焊缝的低温疲劳裂纹扩展行为。该测试程序包括一系列在室温，-20℃和-60℃下的夏比冲击试验和疲劳裂纹扩展试验。实验结果表明，裂纹在基材中的传播速率降低，但对接焊缝中的裂纹传播速率增加，环境温度降低。随着温度的降低，基础材料还显示出增强的疲劳裂纹扩展阈值。疲劳的韧性到脆性的转变温度低于基材的断裂温度，而焊接金属则呈现相反的趋势。通常，对接焊缝在所有测试温度下都比基础材料具有更高的抗疲劳裂纹扩展能力和更大的夏比韧性值。在室温下针对基材测量的巴黎定律参数可以保守地评估低环境温度下焊接接头的裂纹扩展寿命。

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  • 作者

    X.W. Liao; Y.Q. Wang; X.D. Qian; Y.J. Shi;

  • 作者单位

    Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry, Department of Civil Engineering, Tsinghua University, Beijing 100084, China,Department of Civil and Environmental Engineering, National University of Singapore, Singapore 117576, Singapore;

    Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry, Department of Civil Engineering, Tsinghua University, Beijing 100084, China;

    Department of Civil and Environmental Engineering, National University of Singapore, Singapore 117576, Singapore;

    Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry, Department of Civil Engineering, Tsinghua University, Beijing 100084, China;

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  • 正文语种 eng
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  • 关键词

    bridge steel Q345qD; butt weld; ductile-to-brittle transition; fatigue crack propagation; low temperature; threshold;

    机译：桥梁钢Q345qD;对接焊韧性到脆性转变;疲劳裂纹扩展低温;阈;

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