一体化蜂窝板结构参数的优化研究

发布时间：2018-02-25 22:08

本文关键词： 一体化蜂窝板有限元体积比强度参数优化正交设计　出处：《东南大学》2015年硕士论文　论文类型：学位论文

【摘要】：蜂窝板(蜂窝夹层结构)是一种典型的轻质高强结构,具有抗震、隔音、隔热等优点,已经广泛应用于交通、航空、建筑等行业。近年来,在地震和洪水等自然灾害的应急工程中多有应用,包括架设应急桥梁、抢建临时用房等方面。根据板的受力特点可知,抗压强度是蜂窝板的重要力学性能之一,因此本文将对一体化小柱蜂窝板的抗压性能进行研究,进一步对蜂窝板的结构参数进行优化。本文首先全面归纳了我国甲虫前翅仿生研究中关于“小柱蜂窝板的三维结构与力学解析、实物试制与力学特性”方面的进展情况,明确一体化小柱蜂窝板在甲虫前翅仿生研究中的定位,同时也为同行全面了解我国这方面的研究情况提供参考。然后,以完全一体化成型的蜂窝板为研究对象,从短切玄武岩纤维增强树脂基复合材料的性能研究、蜂窝板的压缩力学试验及性能分析、基于Abaqus的小柱蜂窝板的抗压性能研究、小柱蜂窝板结构参数优化研究四个方面进行了研究。主要研究内容如下：(1)短切玄武岩纤维增强树脂基复合材料的性能研究。首先对样本容量为20的单丝纤维进行拉伸试验,测得弹性模量E=82.7GPa；利用改进的混合律方法(Reuss-Voigt模型)和三维随机复合材料的方法,分别计算试验用纤维增强复合材料(纤维体积分数为20%)的理论弹性模量E=2.1GPa和2.48GPa；然后,由实测曲线和理论解析值讨论确定E=2.38GPa。(2)一体化蜂窝板的压缩力学试验及性能分析。首先,制备了带封边结构完全一体化的仿生纤维复合材料蜂窝板,并且提出了制作流程和制备工艺上的改进方向；由试验结果可得,其破坏形态,可大致分为错位型、压实型和断裂三类；其质量比抗压强度优于单侧胶蜂窝板,由此表明生物结构具有优秀的整体性力学性能。(3)基于Abaqus的一体化蜂窝板的抗压性能研究。首先,建立小柱蜂窝板结构的有限元模型,对其受压过程进行模拟分析,以获得压缩状态下的等效应力分布、特征点的最大应力值、位移变形等详细信息。蜂窝板抗压强度的有限元分析结果为41.2MPa,而准静态压缩试验结果为37MPa,变形情况和强度对比表明有限元分析与试验具有较好的一致性,为进一步进行蜂窝板结构的优化奠定基础。(4)一体化蜂窝板结构参数优化研究。以蜂窝板为研究对象,利用有限元分析对其进行参数优化,研究内容包括讨论蜂窝六边形数目、小柱分布密度、小柱直径、面板厚度的参数对小柱蜂窝板的应力分布和抗压性能的影响；以体积比强度为设计目标,分别进行单因子参数分析和参数正交设计。得到讨论范围内的最优解：小柱分布密度N=2、小柱直径D=7mm、面板厚度h=1.5mm时,体积比强度最大。根据分析结果给出小柱蜂窝板的设计建议,为小柱蜂窝板件在实际工程中的设计提供理论依据。
[Abstract]:Honeycomb plate (honeycomb sandwich structure) is a typical lightweight and high-strength structure with the advantages of seismic, sound insulation and heat insulation. It has been widely used in transportation, aviation, construction and other industries in recent years. It is widely used in emergency engineering of natural disasters such as earthquake and flood, including setting up emergency bridges, building temporary houses and so on. According to the stress characteristics of the plates, the compressive strength is one of the important mechanical properties of honeycomb panels. Therefore, in this paper, the compressive performance of honeycomb plates with integrated columns is studied. The structural parameters of honeycomb plate are optimized further. Firstly, the progress of the bionic research on the front wing of beetles in China on the "three-dimensional structure and mechanical analysis, trial-manufacture and mechanical properties of honeycomb plate with small columns" is summarized in this paper. The position of integrated columnar honeycomb plate in the bionic study of beetle's front wing is clarified, and it also provides a reference for colleagues to understand the research situation in this field in our country. Then, taking the fully integrated honeycomb plate as the research object, In this paper, the properties of short cut basalt fiber reinforced resin matrix composites, compression mechanical tests and properties analysis of honeycomb plates, and compressive properties of small column honeycomb panels based on Abaqus are studied. Four aspects of structural parameters optimization of honeycomb panels are studied. The main contents are as follows: 1) the properties of short cut basalt fiber reinforced resin matrix composites. First, tensile tests of monofilament fibers with sample size of 20 are carried out. The theoretical modulus of elasticity of fiber reinforced composites (fiber volume fraction is 20) was calculated by using the modified mixing law method (Reuss-Voigt model) and the method of three-dimensional random composites, respectively, and the theoretical elastic moduli of fiber reinforced composites (fiber volume fraction 20) were calculated by using the modified mixing law method (Reuss-Voigt model) and 2.48GPa. The compressive mechanical test and performance analysis of the integrated honeycomb plate were determined from the measured curves and theoretical analytical values. Firstly, the bionic fiber composite honeycomb plate with complete edge sealing structure was prepared. According to the experimental results, the failure patterns can be roughly divided into three types: dislocation type, compaction type and fracture type, and its specific compressive strength is better than that of one-sided rubber honeycomb plate. It shows that biological structure has excellent overall mechanical properties. (3) Research on compressive performance of integrated honeycomb plate based on Abaqus. Firstly, the finite element model of honeycomb plate with small column is established, and the process of compression is simulated and analyzed. In order to obtain the equivalent stress distribution under compression state and the maximum stress value of the characteristic point, The result of finite element analysis of compressive strength of honeycomb plate is 41.2 MPA, while the result of quasi-static compression test is 37 MPA. The comparison of deformation and strength shows that the finite element analysis is in good agreement with the test. In order to lay a foundation for further optimization of honeycomb plate structure, the parameter optimization of honeycomb plate is studied. The parameters of honeycomb plate are optimized by finite element analysis, including the number of honeycomb hexagons. The influence of the parameters of column distribution density, column diameter and slab thickness on the stress distribution and compressive performance of honeycomb plate with small columns. Single factor parameter analysis and parameter orthogonal design were carried out respectively. The optimal solutions were obtained as follows: the distribution density of small column N ~ 2, the diameter of small column D _ (7) mm, and the thickness of panel h ~ (1.5 mm), the volume specific strength was the largest. According to the analysis results, the design suggestion of honeycomb plate with small column was given. It provides a theoretical basis for the design of honeycomb panels in practical engineering.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU398.9

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