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试样厚度对韧脆转变温度区间的影响

邓彩艳,宋蒙蒙,龚宝明,王东坡

邓彩艳,宋蒙蒙,龚宝明,王东坡. 试样厚度对韧脆转变温度区间的影响[J]. 焊接学报, 2018, 39(5): 1-4. DOI: 10.12073/j.hjxb.2018390110
引用本文: 邓彩艳,宋蒙蒙,龚宝明,王东坡. 试样厚度对韧脆转变温度区间的影响[J]. 焊接学报, 2018, 39(5): 1-4. DOI: 10.12073/j.hjxb.2018390110
DENG Caiyan, SONG Mengmeng, GONG Baoming, WANG Dongpo. Effect of specimen thickness on the shift of the ductile-to-brittle transition curve[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2018, 39(5): 1-4. DOI: 10.12073/j.hjxb.2018390110
Citation: DENG Caiyan, SONG Mengmeng, GONG Baoming, WANG Dongpo. Effect of specimen thickness on the shift of the ductile-to-brittle transition curve[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2018, 39(5): 1-4. DOI: 10.12073/j.hjxb.2018390110

试样厚度对韧脆转变温度区间的影响

Effect of specimen thickness on the shift of the ductile-to-brittle transition curve

  • 摘要: 根据BSI 7448 Part I标准,测定了海洋平台用钢E36以裂纹尖端张开位移(CTOD)为表征的韧脆转变温度曲线. 通过改变试样厚度,研究面外拘束对韧脆转变温度区间的影响并分析了其变化规律. 结果表明,E36钢具有典型的韧脆转变特征,其韧脆转变温度曲线可以用Boltzmann函数进行拟合,具有良好的相关性;试样厚度越大,韧脆转变温度越高,断裂性能下降. 通过有限元模拟分析三维裂纹尖端应力状态,选择了面外拘束参数Tz,用来阐述厚度效应对韧脆转变温度的影响,具有良好的相关性.
    Abstract: According to BSI 7448 Part I, this paper designed three types of CTOD specimens with different thickness B of E36 steel, and CTOD tests were carried out at various temperatures to determine their ductile-brittle transition temperature curve. The test results revealed that E36 steel shows typical ductile-brittle transition characteristic and its ductile-brittle transition curve can be fitted well by Boltzmann function. What’s more, with the increase of the test specimen thickness(TST), the ductile-brittle transition curve shifts to higher temperature. In order to investigate the TST effect on the fracture toughness, an elastic-plastic finite element method (FEM) is used to analyze the stress distributions ahead of crack tips. We found that the out-of-plane constraint parameter Tzcan demonstrate the TST effect on the ductile-brittle transition temperature.
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  • 收稿日期:  2016-09-24

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