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邓彩艳, 张玉凤, 霍立兴. 关于J积分测定方法的比较及相关问题的讨论[J]. 焊接学报, 2006, (10): 23-25,32.
引用本文: 邓彩艳, 张玉凤, 霍立兴. 关于J积分测定方法的比较及相关问题的讨论[J]. 焊接学报, 2006, (10): 23-25,32.
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DENG Cai-yan, ZHANG Yu-feng, HUO Li-xing. Discussion on determination of J-integral and comparison of different test standards[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2006, (10): 23-25,32.
Citation: DENG Cai-yan, ZHANG Yu-feng, HUO Li-xing. Discussion on determination of J-integral and comparison of different test standards[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2006, (10): 23-25,32.
shu

关于J积分测定方法的比较及相关问题的讨论

Discussion on determination of J-integral and comparison of different test standards

    摘要
  • 摘要: 采用多试样方法,应用国内外不同标准测试了X56管线钢焊接接头的低温(-5℃)J-R曲线并对结果进行了分析比较。采用两个夹式引伸计在-5℃下分别得到焊缝和热影响区(HAZ)的双P-V曲线来计算施力点位移,从而得到J积分值。然后对数据点分别根据国家标准GB2038-91和英国标准BS7448进行处理。结果表明,BS7448标准在钝化线、各界限确定等方面存在着很大的优越性,能够拟合得到J-R曲线,计算出J0.2,确定了材料的断裂韧度。而根据国家标准GB2038-91没有合格数据点,从而不能进行断裂韧度的计算。

     

    Abstract: According to different fracture toughness test standard, J-Resistance curve tests were conducted at-5℃ in welded joints of X56 pipeline steel in the multiple specimen method and the test result were compared.According to the double P-V curves of each weld metal and heat affected zone specimen obtained from the two notch opening displacement the load-line displacement and the value of J were calculated. Finally, the best fited curve was determined the valid data points according to GB2038-91 and BS7448, respectively.The result indicates that BS7448 is superior to GB2038-91 on blunt line, exclusion lines and so on.J-Resistance curves and J0.2 was obtained. But there are no valid data points according to GB2038-91 and no further calculation.

     

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