入射角が制約される箇所における X 線応力測定法について

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In this report of a basic study for the residual stress measurement of a practical welded structure through X-ray, the authors derive the φ-(sin)^2ψ method, named tentatively, in which the direction of incident X-ray can be selected arbitrarily, and then investigate to apply the present method to such the portion of a structure as where the direction of incident X-ray is confined by the shapes and arrangements of other members of a structure. Results are summarized as follows; (1) The present method involves the multiple regression analysis of the linear statistical model, in which diffraction angles for incident X-ray on an arbitrary direction is treated as a random variable, and from the solutions of the analysis, the expectations and confidence intervals of stresses are estimated on all directions at a measured portion. (2) The present method, where the direction of incident X-ray is not confined theoretically, can also be applied on such the geometrically confined portion in direction as above-mentioned, and then makes it possible to estimate the stress on any direction at a measured point with accuracy enough for practical usage. (3) For obtaining a more accurate stress at such the confined portion by the present method, it is necessary to increase degrees of freedom through increasing a number of informations of diffraction angle of X-ray, and also, to obtain the informations over the range of the incident angle of X-ray as wide as possible. (4) The apparent diffraction angle of strain-free crystals is treated as one of the partial regression coefficients and estimated through multiple regression analysis.
社団法人溶接学会の論文
1976-12-05

入射角が制約される箇所における X 線応力測定法について

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