Research on the vibration characteristic and fatigue life of a Gasoline engine exhaust manifold in high temperature environment

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (13) : 33-40.

Zhang jun-hong1,2, Zhang yu-sheng1,Wang jian1，Xu zhe-xuan1，Dai hu-wei1

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Abstract

In order to analyze the influence level of thermo-mechanical coupling on fatigue life of exhaust manifold, a fatigue analysis was performed based on thermo-mechanical coupling. First to calculate the temperature of the exhaust manifold based on two-way FSI, then establish a thermal-mechanical coupling model of exhaust manifold to perform the frequency response analysis based on the thermal stress and temperature distribution. The results show that the stress range and peak frequency are changed when temperature and thermal stress are taken into consideration, for different distribution of temperature and stress lead to different structure stiffness. The thermo-mechanical fatigue life is 32.7% lower than vibration fatigue life. Therefore the thermal-mechanical coupling has significant effects on fatigue life and can’t be ignored.

Key words

exhaust manifold / fluid-structure interaction / thermo-mechanical coupling / frequency response analysis / vibration fatigue

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Zhang jun-hong1,2, Zhang yu-sheng1,Wang jian1，Xu zhe-xuan1，Dai hu-wei1. Research on the vibration characteristic and fatigue life of a Gasoline engine exhaust manifold in high temperature environment[J]. Journal of Vibration and Shock, 2017, 36(13): 33-40

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