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The Study on Rubber’s Constitutive Model about Parameters Identification and the Effect of Fitting Error

Fitting accuracy of hyper-elastic constitutive models of rubber and parameter identification of the models play important roles in the finite element analysis of rubber components. In this paper, to obtain stress-strain characteristics, uniaxial and planar as well as biaxial tension of a standard rubber sample are measured. Model parameters of three kinds of classic constitutive models are identified using least square method. Then, the fitting accuracy among different models is compared. The comparison shows that the fitting accuracy is getting higher when the test material strain is increased. Also, it can be concluded that Mooney-Rivlin model and Van der Waals model as well as third-order Ogden model have relatively stable fitting accuracy.