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首页> 外文期刊>Journal of offshore mechanics and arctic engineering >Effect of Strength Matching and Strain Hardening Capacity on Fracture Performance of X80 Line Pipe Girth Welded Joint Subjected to Uniaxial Tensile Loading
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Effect of Strength Matching and Strain Hardening Capacity on Fracture Performance of X80 Line Pipe Girth Welded Joint Subjected to Uniaxial Tensile Loading

机译：强度匹配和应变硬化能力对单轴拉伸载荷下X80管线管环缝焊接接头断裂性能的影响

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摘要

By conducting curved wide plate tensile tests for girth welded joints of X80 line pipe containing a surface notch in the weld metal, the effects of strength matching on fracture performance were evaluated. Parametric studies were also conducted using a finite element method simulating the experiments to clarify the effects of strain hardening capacity of the base metal, softening in the heat affected zone, and groove configuration on fracture performance. A strain at failure significantly decreased with the decreasing strength matching. This was expected to be due to a difference in local straining behavior at the notch tip caused by the shielding effect. The analytical studies revealed that the strain hardening capacity of the base metal, the softening in the heat affected zone, and the groove configuration affected the allowable strain for a given toughness level in the case of overmatching. However, these factors hardly affected the allowable strain in the case of undermatching.
机译：通过对在焊接金属中具有表面凹口的X80管线管的环缝焊接接头进行弯曲的宽板拉伸试验，评估了强度匹配对断裂性能的影响。还使用有限元方法进行了参数化研究，以模拟实验，以弄清母材的应变硬化能力，热影响区的软化以及沟槽构型对断裂性能的影响。随着强度匹配的降低，破坏时的应变显着降低。可以预料这是由于屏蔽效应引起的在切口尖端处的局部应变行为的差异。分析研究表明，在过度匹配的情况下，母材的应变硬化能力，热影响区的软化以及沟槽的形状会影响给定韧性水平下的允许应变。但是，在不匹配的情况下，这些因素几乎不会影响容许应变。

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