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There is significant closure in welded specimen due to the effect of welding residual stress.
在焊接试件中有显著的裂纹闭合现象，其原因是焊接残余应力的作用。
The fatigue performances of welded specimen of tubular joints are tested at low temperature and normal temperature.
通过管节点模型试样的低温和常温疲劳试验，得出了低温环境对试样疲劳s - N曲线的影响系数。
Crack closure of base metal is caused by the residual plastic plastic deformation remaining in the wake of an advancing crack tip and is not as significant as in welded specimen.
而在管线钢基材中裂纹闭合现象较小，闭合原因是裂纹尖端尾部的残余塑性变形。
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