Dynamic response analysis and fatigue life prediction of C/SiC thin laminated plate under thermal-acoustic loadings

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (10) : 76-83.

BAI Wen-jun, SHA Yun-dong , LI Hua-shan，TANG Xiao-ning

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Abstract

In view of the poor working environment of the thin walled structure under the thermal-acoustic loading conditions that extremely easy to occur buckling and acoustic fatigue which can affect the stability and service life of the component. The object is C/SiC composite laminated structure with clamping. Utilizes the finite element method to calculate the nonlinear random response of thin composite laminated structure at various combinations of sound pressure levels and temperatures and obtains the typical thermal-acoustic motion. Though analyzed the response characteristics of laminated structure under the buckling and post buckling and summarized the typical nonlinear vibration response characteristics. Finally based on the high specific strength and special structure fatigue damage mechanism of composite laminated, improved rain flow method to count the stress response of laminated plates under the condition of high temperature and loud noise, combination the data on test of the performance of the material symmetry cycle and fitting the equivalent life formula which considered the mean stress effect and Palmgren-Miner linear cumulative damage criterion to estimate the fatigue life of composite laminated.

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C/SiC composite laminated / thermal-acoustic loading / stress dynamic response / rainflow counting / fatigue life

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BAI Wen-jun, SHA Yun-dong,LI Hua-shan，TANG Xiao-ning. Dynamic response analysis and fatigue life prediction of C/SiC thin laminated plate under thermal-acoustic loadings[J]. Journal of Vibration and Shock, 2017, 36(10): 76-83

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