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日历环境对飞机疲劳关键件性能影响研究

Keywords: 飞机,疲劳,日历环境,动态S-N曲线,细节疲劳额定强度

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Abstract:

针对飞机老龄化带来的结构安全问题,开展2A12-T4铝合金标准试样模拟不同停放日历年的加速环境试验和疲劳实验,计算得到细节疲劳额定强度(DFR)的变化规律,建立基于动态S-N曲线法的疲劳关键件性能退化计算模型,并与退役飞机同种材料试样疲劳寿命对比.结果表明,采用动态S-N曲线法和DFR法建立的寿命预测模型与真实值吻合较好,飞机疲劳关键件的疲劳性能会随着停放日历时间的延长而降低.

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