軸対称残留応力推定法としての相当固有ひずみ概念の提案

概要

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A new concept, the equivalent inherent strain g^<eq>_θ, is proposed for the measurement of axisymmetric residual stresses, based on the inherent strain theory. That is combining the radial and tangential inherent strain components g_r, g_θ into one parameter g^<eq>_θ in computing the axially uniform axisymmetric residual stresses. Based on this concept, the difficulty of estimating the value of g_r is overcome and stress distribution in a long cylinder can be computed by merely estimating g^<eq>_θ and axial inherent strain component g_z from measured strains in tangential and axial directions. Stress distribution in a thin disk or ring can be simply obtained by estimating g^<eq>_θ from measured strain in tangential direction. The concept was verified by the experiment of measuring residual stresses in a pipe with cladding. A numerical simulation was carried out to demonstrate that the measuring method based on g^<eq>_θ has both the convenience of the Sachs method and the high accuracy of the inherent strain method.
社団法人溶接学会の論文
1997-02-05