非対称荷重を受ける多層厚肉回転対称殻のクリープ変形

概要

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The paper describes an analytical formulation and a numerical solution of the creep problems of multi-layered moderately thick shells of revolution under asymmetrical loads with application to a cylindrical shell. The equilibrium equations and the strain-displacement relations are derived from the Reissner-Naghdi theory in elastic shells with given consideration to the effect to shear deformation. It is assumed that the total strain rates are composed of an elastic part and a part due to creep. The elastic strains are proportional to the stresses by Hooke's law. For the constitutive equations in the creep range, McVetty's equation is employed. As a numerical example, the creep of a two-layered cylindrical shell composed of mild steel and stainless steel subjected to locally distributed loads is analyzed. Numerical computations have been carried out for three cases of the ratio of the thickness of the stainless steel layer to the shell thickness. It is found from the computations that the stress distributions and the deformation are significantly varied depending on the ratio.
一般社団法人日本機械学会の論文
1987-01-25