【摘要】：層聯(lián)機(jī)織復(fù)合材料克服了層間強(qiáng)度低、剪切強(qiáng)度差、易分層等缺陷,具有結(jié)構(gòu)的多樣性、形態(tài)的可設(shè)計性、性能的綜合性、以及良好的成型性而受到了廣泛的重視。但是鑒于其生產(chǎn)成本較高,生產(chǎn)效率較低的特點(diǎn),對構(gòu)件提前設(shè)計驗證至關(guān)重要。計算機(jī)輔助工程CAE(Computer Aided Engineering)技術(shù)已廣泛應(yīng)用于航空、航天、機(jī)械、土木結(jié)構(gòu)等領(lǐng)域,已成為工程和產(chǎn)品結(jié)構(gòu)分析中必不可少的數(shù)值計算工具。但是將CAE技術(shù)應(yīng)用在結(jié)構(gòu)復(fù)雜的層聯(lián)機(jī)織復(fù)合材料構(gòu)件上,首先要解決層聯(lián)機(jī)織復(fù)合材料的精確建模,如異型構(gòu)件建模等問題。本文對比分析了不同紗線截面(圓形截面、跑道形截面、雙凸透鏡形截面、橢圓截面)的角聯(lián)鎖結(jié)構(gòu)的細(xì)觀幾何關(guān)系。在分析細(xì)觀結(jié)構(gòu)的基礎(chǔ)上,建立了筒狀立體機(jī)織物細(xì)觀幾何模型。針對任意兩橢圓公切線切點(diǎn)無法求解的問題,基于橢圓對稱性原理和二分法求解思想,編寫了迭代算法求解任意兩橢圓內(nèi)公切線程序。基于ABAQUS有限元軟件,運(yùn)用有限元法預(yù)測纖維束微元的彈性常數(shù),并與橋聯(lián)模型預(yù)測結(jié)果進(jìn)行對比分析。在分析纖維排列規(guī)律基礎(chǔ)上,使用PYTHON編程語言在ABAQUS上進(jìn)行二次開發(fā),編寫了浸膠纖維束建模插件和纖維束微元的彈性常數(shù)預(yù)測插件。本課題在顯微鏡觀察的基礎(chǔ)上,假設(shè)緯紗為橢圓形截面,經(jīng)紗為矩形截面,建立層聯(lián)機(jī)織物細(xì)觀幾何模型,推導(dǎo)了纖維體積分?jǐn)?shù)公式.編寫了層聯(lián)機(jī)織復(fù)合材料結(jié)構(gòu)自動建模插件。
[Abstract]:Due to its low interlaminar strength, poor shear strength and easy delamination, laminated on-line woven composites have attracted much attention due to their diversity of structure, design of morphology, comprehensive properties and good formability. However, due to its high production cost and low production efficiency, it is very important to design and verify the components ahead of time. Computer aided engineering (CAE (Computer Aided Engineering) technology has been widely used in the fields of aeronautics, aerospace, machinery, civil engineering and so on, and has become an indispensable numerical calculation tool in engineering and product structure analysis. But when CAE technology is applied to the laminated woven composites with complicated structure, it is necessary to solve the problem of accurate modeling of the laminated on-line woven composite materials, such as modeling of special-shaped components, and so on. In this paper, the meso-geometric relationships of angular interlocking structures with different yarn sections (circular section, runway section, double convex lens section, elliptical section) are compared and analyzed. Based on the analysis of the mesoscopic structure, the mesoscopic geometric model of cylindrical three-dimensional woven fabric was established. In order to solve the problem that tangent points of any two ellipses can not be solved, an iterative algorithm for solving the internal tangent of any two ellipses is developed based on the elliptic symmetry principle and the idea of dichotomy. Based on ABAQUS finite element software, the elastic constants of fiber bundle microelements are predicted by finite element method, and the results are compared with those of bridge model. On the basis of analyzing the regularity of fiber arrangement, the PYTHON programming language is used to carry on the secondary development on ABAQUS, and the module for modeling the fiber bundle and the module for predicting the elastic constant of the fiber bundle microelement are compiled. On the basis of microscope observation, assuming that the weft is elliptical section and the warp yarn is rectangular section, the mesoscopic geometric model of layered on-line fabric is established, and the fiber volume fraction formula is derived. The automatic modeling plug-in for laminar woven composite structure is developed.
【學(xué)位授予單位】：天津工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TB33

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