航空学报 > 2024, Vol. 45 Issue (13): 229588-229588   doi: 10.7527/S1000-6893.2023.29588

固体力学与飞行器总体设计

浮空器蒙皮力学行为分析及本构建模

夏云超1,2, 邓健1,2, 王增贤1,2, 刘强1,2(), 卢天健1,2   

  1. 1.南京航空航天大学 航空航天结构力学及控制全国重点实验室,南京 210016
    2.南京航空航天大学 多功能轻量化材料与结构工信部重点实验室,南京 210016
  • 收稿日期:2023-09-15 修回日期:2023-09-25 接受日期:2023-10-30 出版日期:2023-11-22 发布日期:2023-11-09
  • 通讯作者: 刘强 E-mail:liuqiang2015@nuaa.edu.cn
  • 基金资助:
    国家重点研发计划(2021YFF0501800);国家自然科学基金(11972185);江苏省自然科学基金(BK20200409);江苏省“双创博士”计划(JSSCBS20210618);中央高校基本科研业务费专项资金(NT2022001);中国博士后科学基金(2022M721609)

Mechanical behavior of aerostat envelope and constitutive modeling

Yunchao XIA1,2, Jian DENG1,2, Zengxian WANG1,2, Qiang LIU1,2(), Tianjian LU1,2   

  1. 1.State Key Laboratory of Mechanics and Control for Aerospace Structures,Nanjing University of Aeronautics and Astronautics,Nanjing  210016,China
    2.MIIT Key Laboratory of Multifunctional Lightweight Materials and Structures,Nanjing University of Aeronautics and Astronautics,Nanjing  210016,China
  • Received:2023-09-15 Revised:2023-09-25 Accepted:2023-10-30 Online:2023-11-22 Published:2023-11-09
  • Contact: Qiang LIU E-mail:liuqiang2015@nuaa.edu.cn
  • Supported by:
    National Key Research and Development Program of China(2021YFF0501800);National Natural Science Foundation of China(11972185);Natural Science Foundation of Jiangsu Province(BK20200409);The High Level Personnel Project of Jiangsu Province(JSSCBS20210618);The Fundamental Research Funds for the Central Universities(NT2022001);China Postdoctoral Science Foundation(2022M721609)

摘要:

为了满足承载及特殊的环境适应性需求,在临近空间服役的浮空器囊体蒙皮由高性能纤维织物、阻氦层、耐候层、粘接层等构成。由于囊体充压水平直接决定了浮空器的承载能力,因此有必要建立能够对蒙皮等效力学行为进行准确预测的本构模型,为浮空器强度和寿命设计奠定基础。考虑到蒙皮由多组分材料构成,通过试验分析了纤维织物和功能层对蒙皮等效力学性能的协同影响。根据试验研究结果,发展了能够描述蒙皮各向异性、非线性力学行为的等效本构模型,预测了蒙皮在正轴和偏轴拉伸过程中其宏观应力、纱线剪切角、试样截面收缩率的变化规律。浮空器蒙皮的本构模拟与试验结果取得了较好的吻合,二者相结合揭示了蒙皮宏观力学响应与微结构变形之间的联系。

关键词: 浮空器蒙皮, 本构模型, 微结构变形, 各向异性, 非线性

Abstract:

To meet the requirements of load-bearing and special environmental adaptability, the envelope of near-space operational aerostats consists of multiple layers, such as high-performance fiber fabrics, helium barrier layers, weather layers, and adhesive layers. Since the internal pressure inside the envelope directly determines load-bearing capacity of the aerostat, it is necessary to develop a reliable constitutive model to predict the equivalent mechanical properties of the envelope, which therefore, lays the foundation for strength and life evaluations of the airship. Effects of fiber fabrics and functional layers on the equivalent mechanical properties of the envelope were investigated by experimental characterizations. Based on experimental results, an equivalent constitutive model was developed to study the anisotropic and nonlinear mechanical behavior of the envelope. For both uniaxial and off-axis tensile conditions, predictions on the effective stress, yarn shear angle and specimen cross-sectional contraction agree well with experimental results. The combined experimental and numerical studies have led to insightful understanding between the overall mechanical response and microstructure deformation of the envelope.

Key words: aerostat envelope, constitutive model, microstructure deformation, anisotropy, nonlinearity

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