本文選題：三維編織 + 細(xì)觀模型�。� 參考：《南京航空航天大學(xué)》2015年碩士論文

【摘要】：本文所研究的三維多層纏繞編織復(fù)合材料是一種新型的三維編織復(fù)合材料,其有著三維編織復(fù)合材料所共有的優(yōu)點(diǎn),同時(shí)又有著自身的獨(dú)特優(yōu)勢,是一種值得深入研究的材料。本文主要從以下幾個(gè)方面對(duì)其進(jìn)行了研究。首先,編織工藝與紗線空間走向的研究,獲得了三維多層纏繞編織復(fù)合材料在底盤上的投影路徑,得到了紗線在空間的分布情況,直觀地展現(xiàn)了三維多層纏繞編織復(fù)合材料的空間構(gòu)型。進(jìn)一步在編織工藝的基礎(chǔ)上建立了三維多層纏繞編織復(fù)合材料單胞,獲得了一些必要的參數(shù),如纖維體積含量、編織角、紗線填充因子等。接著,利用剛度平均法證明了三維多層纏繞編織復(fù)合材料是一種正交各向異性材料,并用該方法和Kregers加權(quán)平均模型WAM分別求解其剛度性能,包括了獨(dú)立的9個(gè)工程彈性常數(shù)�；谒⒌膯伟Ｐ�,用有限元方法重新得到了三維多層纏繞編織復(fù)合材料的彈性常數(shù),并與剛度平均法和WAM預(yù)測的彈性常數(shù)進(jìn)行了對(duì)比,分析了兩種理論解的優(yōu)缺點(diǎn)。其次,利用Abaqus/Explicit進(jìn)行顯式動(dòng)態(tài)分析,并通過用戶自定義材料VUMAT子程序?qū)崿F(xiàn)損傷單元的剛度折減。分別采用Mises準(zhǔn)則和Puck準(zhǔn)則判斷基體和纖維材料的失效狀態(tài),模擬拉伸與壓縮工況下的損傷過程,最終得到了三維多層纏繞編織復(fù)合材料的強(qiáng)度性能。最后,在實(shí)驗(yàn)室利用較為先進(jìn)的RTM工藝復(fù)合成型三維多層纏繞編織復(fù)合材料,獲得了低孔隙率、缺陷較少的試驗(yàn)件,并完成了其力學(xué)性能的測試,將實(shí)驗(yàn)結(jié)果和仿真結(jié)果對(duì)比,分析了誤差原因,證明了本文所用研究方法的準(zhǔn)確性。
[Abstract]:The three dimensional multilayer braided composites studied in this paper are a new type of three dimensional braided composites, which have the common advantages of three dimensional braided composites, and at the same time have their own unique advantages, and are worthy of further study.This article mainly carries on the research from the following several aspects.Firstly, the projection path of 3D multi-layer winding braided composite material on the chassis is obtained by studying the braiding process and yarn spatial trend, and the distribution of yarn in space is obtained.The spatial configuration of three-dimensional multi-layer winding braided composites is displayed intuitively.On the basis of braiding technology, the unit cell of 3D multilayer winding braided composites was established, and some necessary parameters were obtained, such as fiber volume content, braiding angle, yarn filling factor and so on.Then, the stiffness average method is used to prove that the 3D multilayer winding braided composite is an orthotropic material, and the stiffness performance is solved by using this method and the Kregers weighted average model (WAM), including nine independent engineering elastic constants.Based on the established unit cell model, the elastic constants of 3D multilayer winding braided composites are reobtained by finite element method, and compared with the stiffness averaging method and the elastic constants predicted by WAM, the advantages and disadvantages of the two theoretical solutions are analyzed.Secondly, the explicit dynamic analysis is carried out by using Abaqus/Explicit, and the stiffness reduction of the damage element is realized by the user-defined material VUMAT subroutine.Mises criterion and Puck criterion are used to judge the failure state of matrix and fiber material respectively, and the damage process under tensile and compression conditions is simulated. Finally, the strength properties of 3D multi-layer winding braided composites are obtained.Finally, three dimensional multilayer winding braided composites were formed by using advanced RTM process in laboratory. The low porosity and less defects were obtained, and the mechanical properties of the composites were tested and compared with the simulation results.The error causes are analyzed and the accuracy of the research method used in this paper is proved.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TB33

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