On elastic beam models for stability analysis of multilayered rubber bearings

The analysis of the instability phenomena that widely affect the behavior of laminated rubber bearings is examined. A Koiter perturbation strategy is followed. On the basis of two different constitutive relations, two different one-dimensional nonlinear models are used: the first one, linear--elastic, derived from the classical beam theory; the second one, nonlinear--hyperelastic, consistent with the framework of three-dimensional finite elasticity. For the two models, emphasis is placed on the influence of the post-buckling behavior in terms of its load-carrying capacity.