考虑温度的加筋板结构随机振动疲劳寿命预测方法研究
Study on Fatigue Life Prediction Method of Stiffened Plate Structure under Random Vibration Considering Temperature
摘要: 高超音速飞行器在高速飞行时，机体的表面会达到非常高的温度，结构材料在高温条件下其力学性能会发生重大变化。在热应力、外部激励力的联合作用下结构件会发生一定的疲劳破坏。本文对飞行器加筋壁板的动热特性进行了分析，应用有限元方法进行数值模拟，得到飞行器壁板的温度分布，研究了温度对固有振动频率和固有振型的影响以及对疲劳寿命的影响。应用频域方法估算了飞行器壁板的疲劳寿命，并与时域方法估算出的飞行器壁板的疲劳寿命进行了比较。
Abstract:
When the hypersonic vehicle flies at high speed, the surface of the airframe will reach a very high temperature, and the mechanical properties of the structure material will change greatly. Under the combined action of thermal stress and external excitation, fatigue failure will occur to some extent. In this paper, the dynamic and thermal characteristics of the stiffened panel of an aircraft are analyzed, and the finite element method is used for numerical simulation. Then the temperature distribution of the panel is obtained, the effect of temperature on natural vibration frequency, natural vibration mode and fatigue life is studied. The fatigue life of aircraft wallboard is estimated by using the frequency domain method and compared with the time-domain method.
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