两种负泊松比蜂窝结构的数值分析及实验研究

发布时间：2018-04-26 14:29

本文选题：负泊松比 + 蜂窝结构　；参考：《暨南大学》2015年硕士论文

【摘要】：蜂窝夹层结构是一种特殊的层合复合材料,相对于传统材料,它具有轻质、高比强度、可设计性强等诸多优点而被广泛运用于航空航天、船舶、国防等各个领域。蜂窝结构的泊松比宏观表现通常为正值,但随着负泊松比材料研究的不断发展,国内外也相继设计出具有负泊松比效应的蜂窝结构。随着现代高科技社会对工程技术需求的增大,对新型负泊松比蜂窝拓扑结构展开相关的研究工作具有重要的意义。本论文介绍了蜂窝结构、负泊松比材料的发展与应用,以及负泊松比蜂窝结构的国内外研究现状。由于星型蜂窝结构以及箭型蜂窝结构代表性体积单元的特殊性,难以对其进行理论推导,本文将采用有限元数值模拟以及力学实验的两种方法,对两种负泊松比蜂窝结构的力学性能进行研究分析。以均匀化方法的数值计算为理论基础,利用ANSYS有限元软件,对星型以及箭型蜂窝结构的代表性体积单元(RVE)的杨氏模量,剪切模量和泊松比进行计算,并与单层蜂窝夹芯层的计算结果进行对比。通过拉伸有限元模拟,测试其结构整体的拉涨效应;通过弯曲有限元模拟,验证负泊松比材料在承受面外弯矩作用时,横向曲率与主曲率一致的性质。对负泊松比蜂窝结构进行参数分析,研究几何尺寸对结构力学性能的影响。使用3D打印快速成型技术代替传统制造工艺制作实验模型,对负泊松比蜂窝结构试件进行相关力学实验研究。运用非接触式全场应变测量系统VIC-3D测量实验构件在拉伸试验时横向及侧向产生的位移变量。从实验的角度,对星型及箭型负泊松比蜂窝结构的力学性能进行分析,并和有限元分析计算结果进行对比,定性讨论星型、箭型蜂窝结构的力学性能,以及结构尺寸对蜂窝结构力学性能的影响,为后续的相关研究提供了基础和参考。
[Abstract]:Honeycomb sandwich structure is a kind of special laminated composite material. Compared with traditional materials, honeycomb sandwich structure has many advantages such as light weight, high specific strength, good designability and so on. It is widely used in many fields such as aerospace, ship, national defense and so on. The Poisson's ratio of honeycomb structure is usually positive, but with the development of negative Poisson's ratio material research, honeycomb structure with negative Poisson's ratio effect has been designed at home and abroad. With the increasing demand for engineering technology in modern high-tech society, it is of great significance to study the new type of negative Poisson's ratio honeycomb topology. In this paper, the development and application of honeycomb structure, negative Poisson's ratio materials and the research status of negative Poisson's ratio honeycomb structure at home and abroad are introduced. Because of the particularity of the representative volume element of star honeycomb structure and arrow honeycomb structure, it is difficult to deduce it theoretically. In this paper, two methods of finite element numerical simulation and mechanical experiment will be used. The mechanical properties of two kinds of negative Poisson ratio honeycomb structures were studied and analyzed. Based on the numerical calculation of homogenization method, the Young's modulus, shear modulus and Poisson's ratio of star and arrow honeycomb representative volume element are calculated by using ANSYS finite element software. The results are compared with the results of single layer honeycomb sandwich layer. The tensile effect of the whole structure is tested by tensile finite element simulation, and the properties of transverse curvature and principal curvature of negative Poisson ratio material under the action of off-plane bending moment are verified by bending finite element simulation. The parameter analysis of negative Poisson's ratio honeycomb structure is carried out to study the effect of geometry on the mechanical properties of the structure. The 3D printing rapid prototyping technology was used to make the experimental model instead of the traditional manufacturing process, and the related mechanical experiments were carried out on the specimens with negative Poisson's ratio honeycomb structure. A non-contact full-field strain measurement system (VIC-3D) was used to measure the lateral and lateral displacement variables of experimental components in tensile tests. The mechanical properties of star-type and quiver negative Poisson's ratio honeycomb structures are analyzed from the experimental point of view, and compared with the results of finite element analysis, the mechanical properties of star and arrow honeycomb structures are discussed qualitatively. The influence of structure size on the mechanical properties of honeycomb structure provides a basis and reference for further research.
【学位授予单位】：暨南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383

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