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Development of Method of Prediction of Lifespan of Rubber Tubes in Oscillation-absorbing Sections of Automotive Engines in Extremely Low-temperature Environments

Article of Honda R&D Technical Review Vol.29 No.1

Summary

A method of prediction of the lifespan of rubber air flow tubes that connect the air cleaner and the engine and absorb engine oscillation that will contribute to efficient development has been developed.
First, software was selected that would make it possible to numerically simulate the displacement behavior of rubber and the strain generated in the material, and an elastic-plastic CAE model was employed as an analytic model to enable simulation of the nonlinearity of rubber materials.
Tensile tests were then conducted in order to determine the stress-strain characteristics of the materials, and the results were reflected in CAE property data. S-N diagrams were formulated based on the results and results for number of cycles to fracture in unit bellows test pieces in response to repeated oscillation.
Study of the correlation between actual test results and CAE predictions (for bellows behavior and the position of cracks in the bellows) indicated a strong correlation, with a coefficient of determination of 0.92.
The developed method has provided an analytic technique for the prediction of the number of cycles to fracture in air flow tubes based on CAE stress values, making it possible to predict the lifespan of the products.

Reference

(1) Fukahori, Y.: Fracture Reveals Real Structure and Characters of Rubber: Part 2: Fatigue Life of Rubber Elucidated with Rubber Elasticity Theory, The Society of Rubber Science and Technology, JAPAN, Vol. 87, No. 11, p. 454-459, (2014) (in Japanese)
(2) Shangguan, W−B., Wang, X−L., Deng, J−X., Yu, B.: Experiment and modeling of uniaxial tension fatigue performances for filled natural rubbers – Materials and Design, Vol. 58, p. 65-73, (2014)
(3) Sidhu, R. S., Ali, A., Hassan, M. R.: Experimental Determination of Fatigue Life of Automotive Jounce Bumper – Key Engineering Materials, Vol. 462/463, p. 634-638, (2011)
(4) JIS K 6259-1: 2015, Rubber, vulcanized or thermoplastic -Determination of ozone resistance- Part 1: Static and dynamic strain testing (in Japanese)
(5) The Society of Rubber Science and Technology, Japan: Shimban Gomugijutsuno Kiso, 380. p, (2002), (in Japanese)

Author (organization or company)

Takeshi WAKAMATSU(Automobile R&D Center)、Hidemasa USUI(Automobile R&D Center)、Hirofumi HANAFUSA(Automobile R&D Center)、Junko EBISUI(Automobile R&D Center)、Katsushi HASHIMOTO(Automobile R&D Center)

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