Fatigue Life Evaluation of Automotive Engine Mount Insulator

Abstract:

Fatigue life of automotive engine mount insulator made of natural rubber was evaluated. In order to develop an appropriate fatigue damage parameter of the rubber material, a series of displacement controlled fatigue tests was conducted using 3-dimensional dumbbell specimens with different levels of mean displacement. It was shown that the maximum Green-Lagrange strain was a proper damage parameter, taking the mean displacement effects into account. Nonlinear finite element analyses of the rubber engine mount insulator and 3D dumbbell specimen were performed based on a hyper-elastic material model determined from the simple and equi-biaxial tension tests. Fatigue life prediction of the engine mount insulator was made by incorporating the maximum Green-Lagrange strain values, which was evaluated from the finite element analysis and fatigue tests, respectively. Predicted fatigue lives of the engine mount insulator showed a fairly good agreement with the experimental fatigue lives.

• Periodical: Key Engineering Materials (Volumes 385-387)
• Pages: 649-652
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.385-387.649
• Online since: July 2008
• Authors: Chang Su Woo, Wan Doo Kim, Shin Hur
• Keywords: Fatigue Damage Parameter, Fatigue Life Prediction, Fatigue Test, Finite Element Analysis (FEA), Maximum Green-Lagrange Strain, Rubber Engine Mount

References

[1] Hirakawa H, Urano F, Kida M. Analysis of fatigue process of rubber vulcanizates, Rubber Chemistry and Technology, (1978), pp.201-214.

DOI: 10.5254/1.3545829

[2] Mars WV, Fatemi A., A literature Survey on fatigue analysis approaches for rubber, International Journal of Fatigue, Vol. 24(2002), pp.949-961.

DOI: 10.1016/s0142-1123(02)00008-7

[3] Lake GJ., Fatigue and fracture of elastomers, Rubber Chemistry and Technology, vol. 68(1995), pp.435-460.

DOI: 10.5254/1.3538750

[4] Morman KH, Pan TY., Application of finite-element analysis in the design of automotive elastomeric components,, Rubber Chemistry and Technology, (1988), pp.503-533.

DOI: 10.5254/1.3536198

[5] Kim, W., Application of FEA to design of Rubber Component, KSME, vol. 38(2005), p.42.

[6] Yamaguchi, H. & Nakagawa M., Fatigue Test Technique for Rubber materials of Vibration Insulator, International polymer Science and Technology, vol. 20 (1993), pp.64-69.