本文選題：負(fù)泊松比 + 蜂窩結(jié)構(gòu)��； 參考：《暨南大學(xué)》2015年碩士論文

【摘要】：蜂窩夾層結(jié)構(gòu)是一種特殊的層合復(fù)合材料,相對(duì)于傳統(tǒng)材料,它具有輕質(zhì)、高比強(qiáng)度、可設(shè)計(jì)性強(qiáng)等諸多優(yōu)點(diǎn)而被廣泛運(yùn)用于航空航天、船舶、國(guó)防等各個(gè)領(lǐng)域。蜂窩結(jié)構(gòu)的泊松比宏觀表現(xiàn)通常為正值,但隨著負(fù)泊松比材料研究的不斷發(fā)展,國(guó)內(nèi)外也相繼設(shè)計(jì)出具有負(fù)泊松比效應(yīng)的蜂窩結(jié)構(gòu)。隨著現(xiàn)代高科技社會(huì)對(duì)工程技術(shù)需求的增大,對(duì)新型負(fù)泊松比蜂窩拓?fù)浣Y(jié)構(gòu)展開相關(guān)的研究工作具有重要的意義。本論文介紹了蜂窩結(jié)構(gòu)、負(fù)泊松比材料的發(fā)展與應(yīng)用,以及負(fù)泊松比蜂窩結(jié)構(gòu)的國(guó)內(nèi)外研究現(xiàn)狀。由于星型蜂窩結(jié)構(gòu)以及箭型蜂窩結(jié)構(gòu)代表性體積單元的特殊性,難以對(duì)其進(jìn)行理論推導(dǎo),本文將采用有限元數(shù)值模擬以及力學(xué)實(shí)驗(yàn)的兩種方法,對(duì)兩種負(fù)泊松比蜂窩結(jié)構(gòu)的力學(xué)性能進(jìn)行研究分析。以均勻化方法的數(shù)值計(jì)算為理論基礎(chǔ),利用ANSYS有限元軟件,對(duì)星型以及箭型蜂窩結(jié)構(gòu)的代表性體積單元(RVE)的楊氏模量,剪切模量和泊松比進(jìn)行計(jì)算,并與單層蜂窩夾芯層的計(jì)算結(jié)果進(jìn)行對(duì)比。通過拉伸有限元模擬,測(cè)試其結(jié)構(gòu)整體的拉漲效應(yīng);通過彎曲有限元模擬,驗(yàn)證負(fù)泊松比材料在承受面外彎矩作用時(shí),橫向曲率與主曲率一致的性質(zhì)。對(duì)負(fù)泊松比蜂窩結(jié)構(gòu)進(jìn)行參數(shù)分析,研究幾何尺寸對(duì)結(jié)構(gòu)力學(xué)性能的影響。使用3D打印快速成型技術(shù)代替?zhèn)鹘y(tǒng)制造工藝制作實(shí)驗(yàn)?zāi)Ｐ?對(duì)負(fù)泊松比蜂窩結(jié)構(gòu)試件進(jìn)行相關(guān)力學(xué)實(shí)驗(yàn)研究。運(yùn)用非接觸式全場(chǎng)應(yīng)變測(cè)量系統(tǒng)VIC-3D測(cè)量實(shí)驗(yàn)構(gòu)件在拉伸試驗(yàn)時(shí)橫向及側(cè)向產(chǎn)生的位移變量。從實(shí)驗(yàn)的角度,對(duì)星型及箭型負(fù)泊松比蜂窩結(jié)構(gòu)的力學(xué)性能進(jìn)行分析,并和有限元分析計(jì)算結(jié)果進(jìn)行對(duì)比,定性討論星型、箭型蜂窩結(jié)構(gòu)的力學(xué)性能,以及結(jié)構(gòu)尺寸對(duì)蜂窩結(jié)構(gòu)力學(xué)性能的影響,為后續(xù)的相關(guān)研究提供了基礎(chǔ)和參考。
[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.
【學(xué)位授予單位】：暨南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TB383

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