热声载荷下C/SiC层合薄板动态响应分析及寿命预测

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振动与冲击 ›› 2017, Vol. 36 ›› Issue (10) : 76-83.

论文

白文君，沙云东，李华山，唐晓宁

作者信息 +

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

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

Author information +

文章历史 +

摘要

鉴于处在热声载荷下的薄壁结构工作条件恶劣，极易发生屈曲和声疲劳从而影响构件的稳定性和使用寿命。以四边固支C/SiC复合材料层合板结构为研究对象，运用有限元方法计算结构在不同温度和声压级组合下的振动响应，分析屈曲前后响应特性并总结了典型的非线性振动响应特性；基于复合材料层合板高比强和特殊的结构疲劳损伤机理特点，运用改进的雨流法统计了层合板在超高温度强噪声工况下的应力响应，结合材料对称循环疲劳性能试验所得数据拟合地考虑平均应力影响的等效寿命公式和Palmgren-Miner线性累积损伤准则估算层合板的疲劳寿命。

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.

导出引用

白文君，沙云东，李华山，唐晓宁. 热声载荷下C/SiC层合薄板动态响应分析及寿命预测[J]. 振动与冲击, 2017, 36(10): 76-83

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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