Impacts of thermal environment on modal frequency of FGM shells

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (4) : 127-131.

LIU Wenguang，SHU Bin，GUO Longqing，HE Honglin

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Abstract

In order to promote the application of functionally graded materials (FGMs) in the structure of thermal protection systems,the aim of this work is to study the impacts of different temperature fields on the modal frequencies of thermal protection shells and to provide some methods for dynamical design of hypersonic aircrafts. Starting from the thermal-physical property model of the ceramic and metal based FGMs,the modal frequency equation of an FGM shell was derived by using the energy principle. Thereafter,the impacts of the change law of thermal physical properties on modal frequencies were analyzed. And the change law of modal frequency of the FGM shell with thermal stress was discussed under different thermal conditions. Results indicate that the impacts of the change of physical properties on the modal frequency are less than that of thermal-mechanic coupling on the modal frequency. The change law of physical properties plays a main role on modal frequency when the temperature grade below 300 K while the thermal stress and strain plays a main role when the temperature grade above 300 K.

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thermal environment / thermal protection system / functionally graded material / modal frequency

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LIU Wenguang，SHU Bin，GUO Longqing，HE Honglin. Impacts of thermal environment on modal frequency of FGM shells[J]. Journal of Vibration and Shock, 2017, 36(4): 127-131

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