X線による曲がりはりおよび円環の残留応力測定法

概要

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There have been reports of formulas for calculating residual stresses in curved beam or ring respectively made by the mechanical method.^<1)2)> In this study, the calculation formulas for obtaining residual stress distributions in curved beam and ring by the X-ray method are shown. These formulas were applied to curved beams with two different radii of curvature (24 mm and 48 mm) and a ring with the inner radius of 42 mm and the outer radius of 54 mm. The cross sections of both specimens were of the same dimension of 6×8mm^2. All the specimens were made of S45C carbon steel, and thermal residual stresses were introduced in them. Residual stresses were measured by the X-ray as well as the mechanical methods, and the experimental results showed fairly good agreements between the two methods in all cases. Unlike the case of flat plates, residual stresses show unsymmetrical distribution with respect to the central axes, with the result that compressive stresses are a little larger on the concave surfaces and tension peaks are shifted to the concave sides. This tendency is more remarkable in the curved beam with larger curvature, and most conspicuous in the ring. The plate formula is also applied to the curved beams, and it is found that this formula may be used for the curved beam with smaller curvature.
社団法人日本材料学会の論文
1970-02-15