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Assessment of the effect of residual stresses in elastic-plastic fracture of dissimilar welded components

机译：评估残余应力在不同焊接部件弹性塑料骨折中的影响

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摘要

Residual stresses in welds pose a significant threat to the structural integrity of a component, especially in the presence of defects and are required to be accounted for in assessing component safety. Although the R6 assessment procedure suggests various approximate methods for incorporating these effects in defect assessment, most of them are overly conservative and not very cost-effective. A more reliable approach is to characterise the weld residual stresses around a defect and study how they interact with primary load. The current paper analyses the effects of weld residual stresses on the fracture of a dissimilar weld in the presence of defect. The weld is made between modified 9Cr-1Mo steel and 316LN stainless steel using autogenous electron beam welding. A C(T) specimen was extracted from the centre of the weld and a crack introduced in the fusion zone using electro-discharge machining. The residual stresses around the crack were measured on a grid of measurement points at mid-thickness of the C(T) specimen using neutron diffraction on the strain diffractometer SALSA at ILL, Grenoble. The measured residual stresses around the crack-tip were incorporated into a finite element model and the interaction of these with applied load was predicted under fracture.
机译：焊缝中的残余应力对组分的结构完整性构成了显着的威胁，特别是在存在缺陷的情况下，需要考虑评估组件安全性。虽然R6评估程序表明，在缺陷评估中纳入这些效果的各种近似方法，但大多数是过于保守的，而不是非常成本效益。一种更可靠的方法是在缺陷周围的焊接残余应力的表征，研究它们如何与主要负载相互作用。目前纸张分析焊缝残余应力对缺陷存在下不同焊缝骨折的影响。使用自动电子束焊接在改进的9Cr-1Mo钢和316LN不锈钢之间进行焊接。使用电放电加工从焊接中心提取C（T）样本和在融合区中引入的裂缝。使用中子衍射在菌株衍射仪Salsa的中子衍射下，在C（T）样本的中间厚度下的测量点的网格上测量裂缝周围的残余应力。将裂纹尖端周围的测量的残余应力掺入有限元模型中，并在裂缝下预测这些与施加的载荷的相互作用。

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