著者

下羽 悠一 石川 徹朗 大谷 眞一 秋田 貢一

出版者

公益社団法人 日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.55, no.12, pp.1139-1145, 2006 (Released:2006-12-20)

参考文献数

8

被引用文献数

3 4

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The X-ray stress measurement based on sin2ψ method has been widely adopted. This technique is not entirely efficient, because it is necessary to measure each diffraction profile one after other at five and more incident X-ray angles. On the other hand, stress measurement based on cosα method was proposed using X-ray film as detector. In this method, the stresses are determined from Debye-ring obtained at a single X-ray incident angle with high efficiency. However, it has the problem in this accuracy on stress determination. In this study, a new stress analyzer with sixteen position sensitive proportional counters (PSPC) radially arranged for incidence X-ray was developed. We examined to determine the plane stress components by multi-regression analysis using sixteen diffraction angles on a Debye-ring. As a result, stress components of σx and τxy were measured with sufficient accuracy. However, a stress of σy had large dispersion, because of low strain sensitivity in the y direction. Moreover, it was clarified that σy had pseud-multicollinearity on multi-regression analysis. The accuracy of σy value itself could not be improved, though an analysis to eliminate an effect of pseud-multicollinearity was carried out. In this paper, we proposed the new method to determine the components using two Debye rings obtained by X-ray incidences in both x and y directions. We tried to measure the residual stress components in the butt welded joint using the method. As a result, it was confirmed that the stresses, σx and σy, were obtained in the sufficient accuracy, and that the shear stress, τxy, was arising near the bond in the welds.