Modeling and analysis of laminated rubber bearings under axial tensile loading
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To analyze the tension performance of laminated rubber bearings under tensile loading, a tension model for analyzing the rubber layers is proposed based on the theory of elasticity. Applying the boundary restraint condition and the assumption of incompressibility of the rubber layers, stress and deformation expressions for the tensile rubber layers are derived. Based on the derived expressions, the stress distribution and deformed pattern specifically for deformed shape of the free edges of rubber layers are analyzed, and the theory of cracking energy is applied to analyze the distributions of predicted cracking energy density and gradient direction. Prediction of crack initiation and crack propagation direction of the rubber layers is investigated. The analytical results show that the stress and deformation expressions can be used to simulate the stress distribution and deformed pattern of the rubber layer for laminated rubber bearings in the elastic range, and the crack energy method for predicting the failure mechanism is feasible according to the experimental phenomenon.
KeywordsLaminated rubber bearing Isolation Deformation Tension model Tensile stress Finite-element method
The authors would like to thank Dr. Zhang Zhiqian and Fan Chunyu for their support. This work was financially supported by the Natural Science Foundation (50978009) and Beijing Science and Technology Foundation (KM201210005025).
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