预应力双稳态薄膜层合壳结构设计与分析

发布时间：2018-04-02 05:40

  本文选题：双稳态结构　切入点：预应力　出处：《哈尔滨工业大学》2017年硕士论文

【摘要】：多稳态结构是一种单一结构具备多种稳定构型的新型可变形结构,在每种稳定构型下不需要持续的能量输入,并且具有一定的承载能力。多稳态结构可以在较小的能量输入下实现从一种稳定构型屈曲跳变到另一种稳定构型,其可变形特点以及在稳态构型转变过程展现出的变刚度特性,在变体结构设计方面具有非常好的应用前景。目前,多稳态结构的研究多集中在双稳态复合材料层板和预应力双稳态金属壳,对于预应力方法制备双稳态薄膜层合壳关注较少。双稳态薄膜层合壳质轻柔软,结构刚度小,相对于双稳态金属壳实现跳变需要更少的能量输入,并且克服了双稳态复合材料层板的尺寸效应,在小型化、微型化双稳态结构设计方面具有显著优势。本文从实验制备、力学性能分析以及双稳态结构应用设计等方面对预应力双稳态薄膜层合壳展开研究。本文针对预应力方法制备双稳态薄膜层合壳进行了实验方案设计,为满足双稳态薄膜层合壳实验制备需求,设计了位移加载双轴拉伸装置,并对薄膜层间粘结剂进行了筛选。本文制备了多种规格反对称双稳态薄膜层合壳,对层合壳两种稳定状态下构型曲率以及中心加载跳变临界载荷分别进行了测试,并对双稳态薄膜层合壳的基本力学性能进行了分析。针对规则拉伸与不规则拉伸两种情况,对反对称双稳态薄膜层合壳的结构构型进行了实验分析,考察了预拉伸量、层合壳尺寸(长宽比、中间夹层)等因素对层合壳构型的影响,发现预拉伸量增加,层合壳构型曲率随之正比例增长,层合壳尺寸对层合壳构型影响较小。对规则拉伸层合壳构型建立了理论预报模型,并利用有限元方法对其进行了计算,将计算结果与实验结果进行了比对分析,误差在7%以内。最后,本文依据双稳态柔性薄膜层合壳结构的特点进行应用设计,将双稳态薄膜层合壳结构与微带阵列天线相结合,进行了双稳态可重构天线设计。借助电磁仿真软件对双稳态可重构微带天线两种稳定状态下天线方向图和工作频率进行了计算,考察了卷曲状态时构型曲率半径对天线方向图的影响;并利用丝网印刷工艺对双稳态可重构天线进行制备,对天线性能进行了实验测试,验证了设计可行性。
[Abstract]:Multi-stable structure is a new type of deformable structure with multiple stable configurations, which does not require sustained energy input under each stable configuration, and has a certain bearing capacity.The multi-steady structure can change from one stable configuration buckling to another stable configuration with small energy input. The deformable characteristics and the variable stiffness characteristics of the steady state configuration transition process can be obtained.It has a very good application prospect in variant structure design.At present, the research of multistable structures is mainly focused on bistable composite laminates and prestressing bistable metal shells, and less attention is paid to the preparation of bistable thin film laminated shells by prestressing method.The bistable thin film laminated shell is light and soft, and its structure stiffness is small. Compared with bistable metal shell, it requires less energy input to realize jump, and it overcomes the size effect of bistable composite laminates and is miniaturized.Miniaturized bistable structure design has significant advantages.In this paper, the prestressing bistable thin film laminated shell is studied from the aspects of experimental preparation, mechanical properties analysis and bistable structure application design.In this paper, the experimental scheme of preparing bistable thin film laminated shell by prestressing method is designed. In order to meet the requirement of experimental preparation of bistable thin film laminated shell, a biaxial tension device with displacement loading is designed, and the binder between film layers is screened.In this paper, a variety of antisymmetric bistable thin film laminated shells are prepared. The curvature of the configuration and the critical load of the central loading jump are measured in two stable states of the laminated shells.The basic mechanical properties of bistable thin film laminated shells are analyzed.In this paper, the configuration of antisymmetric bistable film laminated shell is experimentally analyzed in the case of regular drawing and irregular drawing. The amount of pretension, the dimension of laminated shell (ratio of length to width, ratio of length to width) are investigated.It is found that the curvature of the laminated shell increases in proportion with the increase of pretension and the size of the laminated shell has little effect on the configuration of the laminated shell.The theoretical prediction model of regular tensile laminated shell is established, and the finite element method is used to calculate it. The calculated results are compared with the experimental results, and the error is less than 7%.Finally, according to the characteristics of bistable flexible thin film laminated shell structure, the bistable film laminated shell structure and microstrip array antenna are combined to design the bistable reconfigurable antenna.The antenna pattern and working frequency of bistable reconfigurable microstrip antenna in two stable states are calculated by electromagnetic simulation software. The influence of curvature radius of configuration on antenna pattern is investigated.The bistable reconfigurable antenna was fabricated by screen printing technology. The performance of the antenna was tested experimentally and the feasibility of the design was verified.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB383.2
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本文编号：1699060