Material Parameter Identification Method for Rubber Mount Constitutive Equation 2023-01-1154

Abstract: As an important vibration damping element in automobile industries, the rubber mount can effectively reduce the vibration transmitted from the engine to the frame. The influence of preload on the static characteristics of rubber mounts and the identification of hyper-elastic material model coefficients were studied. Firstly, a test rig for stiffness test of a mount with preload was designed, and the influence of preload on the static force versus displacement of mounts was studied. Then, the model for estimating force versus displacement of rubber mounts was established, the response surface model for identifying coefficients was established, and the identification method for estimating constitute parameter of rubber materials was proposed the crow search algorithm. Taking one rubber mount as the research object, and taking the constitute material coefficients of hyper-elastic model as the variables, using response polynomial between force versus displacement as the objective function, a least squares method is used to ontain constitute material coefficients. The force versus displacement for another mount is estimated using the obtained constitutive parameters along with the developed model. The measured and estimated force versus displacement show that, the average error between the calculated and experimental values of stiffness in each direction is within 10%. When the response polynomial corresponding to the nonlinear curve is used, the identified constitutive parameters are more accurate. The coefficients identification method proposed in this paper considers the influence of preload, which can provide reference for the accurate identification of constitutive parameters. Key words: rubber mount; parameter identification; tooling design