STRESS ANALYSES OF MOTOR SUSPENSION BUSH

Abstract

Bushings are made of a rubber material, which is also considered as a nonlinear and viscoelastic relationship between the forces and moments and their corresponding displacements and rotations. First, the development and implementation, on a multibody dynamic’s environment, of a constitutive relation to model bushing elements associated with mechanical joints is presented. This thesis details the theoretical and finite element method to predict the stresses, deformation was carried out in Motor Suspension bush. The bushing is modeled in a multibody code as an arrangement of springs that penalize the motion between the bodies connected. In the methodology proposed here, a finite element model of the bushing is developed in the framework of a finite element (FE) code to obtain the curves of displacement/rotation versus force/moment for different loading cases. The basic ingredients of the multibody model are the same vectors and points relations used to define kinematic constraints in any multibody formulation. Upon doing the stress analysis of motor suspension bush, it is found that NeoHookean rubber due to high strain energy sustains very less stress and deformation. It is found that it is efficient to avoid metal to metal interaction preventing damages in the vehicle’s parts.