球の残留応力の測定について

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タイトル別名
  • On the Measurement of the Residual Stress in Sphere
  • タマ ノ ザンリュウ オウリョク ノ ソクテイ ニ ツイテ

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The new method of the measurement of residual stress in a heat treated sphere is explained, consisting of the removal of the outer layer of the sphere by corrosion and the measurement of the mean specific volume of the specimen by the balance. Let θσt and 0σγ be the residual stresses in the circumferential and radial direction respectively and also let υ^-0 and υ^- be the mean specific volume of the specimens before and after the removal of the outer layer from the radius γ0 to γ, then the residual stresses at the radius γ are [numerical formula] where, E : Young's modulus, ν : Poisson's ratio, ν^-(0) : the specific volume of the small elements into which the body is subdivided, and Δ=(ν^-(0) -ν^-0)/3ν^-0. The procedure and actual data of the measurement on a heat treated bearing ball are explained.

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