航空学报 > 2022, Vol. 43 Issue (9): 425642-425642   doi: 10.7527/S1000-6893.2021.25642

热环境下纤维增强复合材料圆柱壳非线性振动分析与验证

李晖1,2, 吕海宇1,2, 邹泽煜1,2, 罗忠1,2, 马辉1,2, 韩清凯1,2   

  1. 1. 东北大学 机械工程与自动化学院, 沈阳 110819;
    2. 东北大学 航空动力装备振动及控制教育部重点实验室, 沈阳 110819
  • 收稿日期:2021-04-08 修回日期:2021-04-26 出版日期:2022-09-15 发布日期:2021-05-21
  • 通讯作者: 李晖,E-mail:ygduan@mail.xjtu.edu.cn E-mail:ygduan@mail.xjtu.edu.cn
  • 基金资助:
    国家自然科学基金(52175079);特种环境复合材料技术国家级重点实验室基金(6142905192512);中央高校基本科研业务费专项资金(N2103026);中国博士后科学基金(2020M680990);航空发动机及燃气轮机重大专项基础研究项目(J2019-I-0008-0008)

Analysis and verification of nonlinear vibrations of fiber-reinforced composite cylindrical shells in thermal environment

LI Hui1,2, LYU Haiyu1,2, ZOU Zeyu1,2, LUO Zhong1,2, MA Hui1,2, HAN Qingkai1,2   

  1. 1. School of Mechanical Engineering & Automation, Northeastern University, Shenyang 110819, China;
    2. Analysis and verification of nonlinear vibrations of fiber-reinforced composite cylindrical shells in thermal environment
  • Received:2021-04-08 Revised:2021-04-26 Online:2022-09-15 Published:2021-05-21
  • Supported by:
    National Natural Science Foundation of China (52175079); The Science Foundation of the National Key Laboratory of Science and Technology on Advanced Composites in Special Environments (6142905192512); The Fundamental Research Funds for the Central Universities of China (N2103026); The China Postdoctoral Science Foundation (2020M680990); The Major Projects of Aero-Engines and Gas Turbines (J2019-I-0008-0008)

摘要: 对热环境下纤维增强复合材料圆柱壳的非线性振动开展了理论分析与测试验证研究。首先, 基于应变能密度函数法和复模量法, 结合多项式拟合技术提出了考虑振幅和温度依赖性的该类型复合材料非线性拉伸模量、剪切模量和损耗因子的显式表达式。接着, 结合Love壳体理论、能量法和von-Kármán非线性应变-位移关系建立了结构的解析模型, 并推导了其在均匀热环境中的振动微分方程, 实现了非线性共振频率、阻尼比和振动响应的求解。最后, 利用自行搭建的热振实验系统对CF120碳纤维/环氧圆柱壳试件开展了测试, 验证了提出的模型及其分析结果的正确性。

关键词: 钛合金, 钛液滴, 火蔓延, 临界条件, 参数分析

Abstract: Theoretical analysis and experimental verification of the nonlinear vibration characteristics of the fiber reinforced composite cylindrical shell in the thermal environment are conducted in this paper. Firstly, based on the strain energy density function method, complex modulus principle and polynomial fitting technique, explicit expressions of the nonlinear tensile moduli, shear moduli and loss factors of this type of composite material are proposed with consideration of amplitude and temperature dependence. Then, on the basis of the Love's shell theory, energy method and von-Kármán nonlinear strain-displacement relationship, an analytical model of the structure is established, and differential equations for vibration of the structure in the uniform thermal environment are derived, so as to solve the nonlinear resonant frequencies, damping ratios, and resonant responses of the structure. Finally, specimens of the CF120 carbon/epoxy composite cylindrical shell were tested based on a self-built thermal vibration experimental system, verifying the correctness of the model proposed as well as its analysis results.

Key words: nonlinear vibration, fiber-reinforced composite, cylindrical shell, thermal environment, parameters identification

中图分类号: