高超飞行器在热声载荷作用下结构的疲劳破坏问题日益严峻, 通过应用雨流计数法, 基于Miner线性累积损伤理论估算结构的疲劳寿命。以四边简支的薄壁铝合金结构为模型, 计算了在160dB声压级、不同温度时结构的非线性动态响应, 并且估算了相应载荷情况下结构的疲劳寿命。结果表明, 在压级载荷不变情况下, 随着温度的增加, 结构的疲劳寿命呈现先降低再升高的趋势, 并且在跳变时, 疲劳寿命降至最低。
The fatigue failure problem of hypersonic vehicle structures under thermal-acoustic loadings has become increasingly serious. This paper utilizes the rain flow cycle counting scheme and the Miner accumulative damage model to predict the fatigue life of thin-walled structure. Taking the aluminum plate with clamping as the object , this paper calculates the nonlinear random response of thin-walled structure at various combinations of 160dB and different temperatures, and predicts the appropriate fatigue life under the corresponding loading conditions. Results show that in the same sound pressure level loading, the fatigue life reduces first and then grows with the increase of temperature, and it drops to the lowest when the structure enters snap-through regime.
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