Abstract
When we design the laminated rubber bearings for safety, it is important to investigate the characteristics of ultimate behaviors of them. In this paper, we establish the method of investigating the ultimate behaviors of the laminated rubber bearings based on FEM analysis. Under vertical tensile deformation, voids are generated in rubber and vertical stiffness of the laminated rubber bearings degrade abruptly. Even under vertical compression and large horizontal deformation, voids are generated partly in rubber due to bending deformation of the laminated rubber bearings. Firstly, we propose the hyperelastic constitutive law showing the behavior of stiffness degradation under uniform triaxial tensile deformation, and apply it to inner rubber. Next, we check the validity of the constitutive law by comparing the results of the tensile deformation analysis with those of the tensile deformation test. Finally, we discuss the results of FEM model we propose.
