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Finite element tire model with aged rubber compound characterization
Technical Paper
2005-01-4065
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Rubber compound aging is unavoidable. It changes material molecular structure and mechanical properties resulting in undesirable changes in tire performance. The behavior of aged tires was simulated using the finite element method after investigations regarding the boundary conditions, such as temperature, air composition and time of exposure, to reproduce in laboratory the aging observed in the market. During service life, the tire undergoes repeated and complex stress cycles resulting in heat generation by hysteresis. It is critical in regions like belt edges where temperature measurements show values up to 70°C for passenger car tires and more than 100°C for trucks. The inflated air permeates through the tire components leading to oxidative conditions propitious to fatigue and crack propagation. Aging is related to the tire operational conditions but engineers usually accelerate the process in lab tests by increasing the temperature, following the Arrhenius law. Ahagon's previous work was reproduced here and used to interpret the aging mechanisms, by analyzing the relation between elongation to brake and the modulus at a hundred percent elongation for different aging conditions. The proposed tire model is able to analyze structural stress concentrations and predict the dynamic behavior of aged tires. The correct compound characterization showed to be essential to assure a good modeling and analysis, which leads to a better tire development and a longer service life.
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Citation
Carvalho, P., Costa, A., and Padovese, L., "Finite element tire model with aged rubber compound characterization," SAE Technical Paper 2005-01-4065, 2005, https://doi.org/10.4271/2005-01-4065.Also In
References
- Ahagon, A. Kida, M. Kaidou, H. Aging of tire parts during service-Part I Rubber Chem. Tech. 63 683 697 1990
- Kaidou, H. Ahagon, A. Aging of tire parts during service-Part II Rubber Chem. Tech. 63 698 712 1990
- Wise, J. Gillen, K. T. Clough, R.L. Quantitative model for the time development of diffusion-limited oxidation profiles Polymer 38 8 1929 1944 1997