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热声载荷下薄壁结构振动响应试验验证与疲劳分析

沙云东 王建 赵奉同 骆丽

沙云东, 王建, 赵奉同, 骆丽. 热声载荷下薄壁结构振动响应试验验证与疲劳分析[J]. 航空动力学报, 2017, 32(11): 2659-2671. doi: 10.13224/j.cnki.jasp.2017.11.013
引用本文: 沙云东, 王建, 赵奉同, 骆丽. 热声载荷下薄壁结构振动响应试验验证与疲劳分析[J]. 航空动力学报, 2017, 32(11): 2659-2671. doi: 10.13224/j.cnki.jasp.2017.11.013
Vibration response experimental verification and fatigue analysis of thinwalled structures to thermalacoustic loads[J]. Journal of Aerospace Power, 2017, 32(11): 2659-2671. doi: 10.13224/j.cnki.jasp.2017.11.013
Citation: Vibration response experimental verification and fatigue analysis of thinwalled structures to thermalacoustic loads[J]. Journal of Aerospace Power, 2017, 32(11): 2659-2671. doi: 10.13224/j.cnki.jasp.2017.11.013

热声载荷下薄壁结构振动响应试验验证与疲劳分析

doi: 10.13224/j.cnki.jasp.2017.11.013
基金项目: 航空基础科学基金(20151554002)

Vibration response experimental verification and fatigue analysis of thinwalled structures to thermalacoustic loads

  • 摘要: 由于热声环境下金属薄壁结构表现出复杂的大挠度强非线性振动响应特性,影响结构的疲劳性能与寿命,结合有限元法与降阶模态法对四边固支高温合金矩形薄壁结构的热声响应进行计算。结果研究发现:屈曲后结构出现跳变运动且应力循环呈三角状分布,热声载荷的相对强弱决定了跳变形式。采用改进雨流计数法、Morrow平均应力模型、Miner线性损伤累积理论计算热声疲劳寿命,屈曲前到临界屈曲时应力循环损伤量级显著增大,由10-5增大到10-4,寿命随温度增加呈先减小后增加趋势。开展薄壁结构热声试验,并将仿真计算结果与试验结果进行对比,结果表明结构的模态频率偏差不超过1Hz,动态应变响应结果的量值相当,验证了薄壁结构热声响应计算方法与模型的有效性。

     

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出版历程
  • 收稿日期:  2016-04-13
  • 刊出日期:  2017-11-28

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