引張負荷による免震用ゴム材料のボイド生成

概要

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Rubber material is a most important component of seismic isolation bearing. Usually, this rubber has to be subjected to compression load, never tension because the heavy weight structure, e. g. building, is put on. Recently, the seismic isolation rubber bearing is applied to the light weight structure. On this case, the design will be considered that the bearing will be subjected to tension load because of structure tilt. Since the void nucleation due to tension affects the mechanical properties of this, it is important that the critical stress for void nucleation is to be clear. The cyclic tension tests are conducted for obtaining the variation of stress-strain relation using by thin rubber disk specimen modeled on a seismic isolation rubber bearing. After the tests specimens are cut and observed the surface configuration, especially void nucleation. Consequently, The stress-strain relation on first cyclic load has a hysteresis loop caused by void nucleation. Next, the stress distribution in the rubber disk under tension load are determined by FEM. From the comparison of experiment it is indicated that the triaxial stress is efficient for the parameter of void nucleation and the critical stress of void nucleation is determined.
社団法人日本機械学会の論文
2002-05-25