コイルばねのクリープ挙動解析手法の提案

概要

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One of the uses of coil springs is to keep two structural elements in contact by their mechanical pressure force. When the springs are used in a high-temperature environment, their pressure forces change due to creep. Therefore, it is necessary to analyze creep behavior of coil springs and to estimate the initial pressure force in order to maintain sufficient pressure force during the period in service. First, it is desirable to survey parametrically the creep behaviors of coil springs with various dimensions rather than to analyze the detailed behaviors by FEM. A convenient analysis method of creep behavior of coil springs is presented in this paper. In the development of the method, the torque of the spring is derived based on the assumption of shear stress field, linear distribution of shear strain in the radial direction and the constitutive equation of creep. Finally, the spring force is obtained by the equilibrium equation as a function of time. For implementation of this method, a simple program should be created since the shcar stress distribution in the radial direction is nonlinear; however, a wide-range parametric survey can be done on the creep behaviors of coil springs of arbitrary dimensions and materials.
社団法人日本機械学会の論文
1997-06-25