Neutron Diffraction Analysis of Complete Residual Stress Tensors in Conventional and Rolled Gas Metal Arc Welds
Neutron Diffraction Analysis of Complete Residual Stress Tensors in Conventional and Rolled Gas Metal Arc Welds
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DOI：
10.1007/s11340-012-9631-3
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发表时间：
2013-02
影响因子：
2.4
通讯作者：
H. Coules;L. D. Cozzolino;P. Colegrove;S. Ganguly;S. Wen;T. Pirling
中科院分区：
文献类型：
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作者：
H. Coules;L. D. Cozzolino;P. Colegrove;S. Ganguly;S. Wen;T. Pirling
本文用中子衍射法研究了高压滚压对电弧焊残余应力的影响。轧制被发现大大改善了残余应力分布，在焊缝处引起显著的压应力。所呈现的数据的一个新颖方面是，在每个测量位置处，评估了九个不同方向上的法向应变，从而能够计算完整的应变和应力张量。因此可以确认，主应力方向通常靠近试样坐标轴（即，它们与焊接和轧制方向对齐良好），并且轧制不会引起任何可能产生有害影响的显著附加残余应力。文中还讨论了残余应力全张量测量的不确定度估计方法和应用。
Mitigation of residual stress in an arc weld by high-pressure rolling of the weld seam has been investigated using neutron diffraction. Rolling was found to greatly improve the residual stress distribution, causing significant compressive stresses at the weld line. A novel aspect of the data presented is that at each measurement location, normal strains in nine separate directions were evaluated, enabling calculation of the complete strain and stress tensors. It is thus confirmed that the principal stress directions generally lay close to the specimen coordinate axes (i.e. that they are well-aligned with the direction of welding and rolling), and that rolling does not cause any significant additional residual stresses which could have detrimental effects. Methods of uncertainty estimation and the applications of full-tensor residual stress measurements are also discussed.