A Study on Nonlinear Characteristics of Rubber Isolator

概要

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Rubber-like materials have strong nonlinearities in dynamic and static stiffness and damping characteristics. To confirm all of the nonlinearities of rubber material, a large number of tests must be carried out. Therefore, an evaluation method by which stiffness and damping characteristics including several nonlinearities of rubber element can be estimated by a few kinds of material tests would be greatly useful. The purpose of this study is to establish an evaluation method in which the nonlinearities of rubber-like material caused by loads simultaneously applied in both the shear and compression directions are taken into consideration. As the first step of this study, a material stretch test, a static load test and an FEM analysis were carried out to determine the nonlinear characteristics of static stiffness caused by loads applied in both the compression and shear directions. The method proposed in this paper for correcting material parameters on the basis of the strain level of the rubber was verified to be useful for accurate estimation of nonlinear stiffness. It was verified that the dependency of the static stiffness on the initial deformation can be expressed by the FEM analysis and the proposed method can precisely estimate the nonlinear behavior of rubber isolators.