本文關(guān)鍵詞：玻纖增強注塑成型構(gòu)件結(jié)構(gòu)強度研究　出處：《湖南工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 玻纖增強復(fù)合材料 注塑成型構(gòu)件 各向異性 玻纖均質(zhì)化RVE模型 玻纖取向分布 結(jié)構(gòu)強度分析

【摘要】：隨著軌道交通行業(yè)的迅速發(fā)展,玻纖增強復(fù)合材料已得到了廣泛的應(yīng)用,而注塑成型是經(jīng)濟、高效和廣泛應(yīng)用的主要技術(shù)手段之一。由于玻纖增強注塑成型構(gòu)件內(nèi)部玻纖取向分散,若要準確預(yù)測和分析其承載特性和結(jié)構(gòu)強度,就不能不考慮因玻纖取向分布而產(chǎn)生的材料各向異性性能。本文從影響玻纖增強注塑成型構(gòu)件的力學(xué)性能出發(fā),考慮玻纖質(zhì)量分數(shù)、玻纖間相互作用、玻纖長徑比以及注塑工藝參數(shù)的影響,基于復(fù)合材料力學(xué)理論建立玻纖均質(zhì)化模型,對玻纖增強復(fù)合材料的正交各向異性宏觀力學(xué)特性以及注塑成型構(gòu)件結(jié)構(gòu)強度進行了研究。主要工作如下:1.針對注塑成型的玻纖增強復(fù)合材料,研究二階玻纖取向張量與玻纖取向角度之間的連續(xù)函數(shù)關(guān)系,建立了玻纖均質(zhì)化RVE模型�；赥aguchi正交試驗設(shè)計方法,利用DIGIMAT軟件對玻纖增強復(fù)合材料RVE模型進行仿真實驗,定量分析玻纖質(zhì)量分數(shù)(A)、玻纖長徑比(B)和玻纖取向張量(C)對玻纖增強復(fù)合材料力學(xué)特性的影響規(guī)律。2.考慮玻纖增強復(fù)合材料注塑成型過程中的玻纖分層效應(yīng),提出了夾芯分層模型并進行鋪層設(shè)計�；诨蚁淅碚摵头辞蠊こ�,選取玻纖長徑比、表層厚度比和芯層厚度比、表層玻纖取向張量、玻纖取向矢量旋轉(zhuǎn)角四個影響因素,反演預(yù)測玻纖增強復(fù)合材料PA66(GF50)的正交各向異性彈性常數(shù),并與材料的宏觀拉伸彈性模量E33、泊松比u31和泊松比u32的試驗結(jié)果進行對比驗證,相對誤差分別為0.92%、1.82%和2.43%。3.研究玻纖增強注塑成型構(gòu)件在成型過程中的玻纖取向狀態(tài),基于廣義牛頓流體本構(gòu)方程,采用ARD-RSC玻纖取向模型,考慮玻纖間相互作用,應(yīng)用數(shù)值模擬方法預(yù)測注塑成型構(gòu)件的玻纖取向分布�；趶�(fù)合材料細觀力學(xué)Mean Field均勻化方法,綜合運用復(fù)合材料細觀建模、離散均質(zhì)化RVE模型場法、注塑成型加工和結(jié)構(gòu)有限元分析技術(shù),構(gòu)建了玻纖增強注塑成型構(gòu)件各向異性強度分析方法流程圖。4.對玻纖增強注塑成型牽引桿進行各向異性強度仿真分析,結(jié)果顯示危險位置與實際破壞位置較為吻合。在此基礎(chǔ)上對牽引桿進行了結(jié)構(gòu)改進,結(jié)果表明桿體中間部分在拉伸載荷下的最大主應(yīng)力降低了57.18%,在壓縮載荷下的最大主應(yīng)力降低了79.25%。表明玻纖增強注塑成型工程結(jié)構(gòu)件通孔設(shè)計不利于提高其承載能力。
[Abstract]:With the rapid development of rail transit industry, glass fiber reinforced composites have been widely used, and injection molding is economic. One of the most effective and widely used techniques. Because of the dispersion of glass fiber orientation in glass fiber reinforced injection molding components, it is necessary to accurately predict and analyze the bearing characteristics and structural strength of glass fiber reinforced injection molding components. The anisotropy of the material caused by the orientation distribution of glass fiber can not be taken into account. In order to influence the mechanical properties of glass fiber reinforced injection molding components, the mass fraction of glass fiber and the interaction between glass fibers are considered in this paper. Based on the mechanical theory of composite materials, the glass fiber homogenization model was established based on the influence of the ratio of length to diameter of glass fiber and the parameters of injection molding. In this paper, the orthotropic macroscopic mechanical properties of glass fiber reinforced composites and the structural strength of injection molding components are studied. The main work is as follows: 1. The continuous function relationship between the second order glass fiber orientation Zhang Liang and the glass fiber orientation angle is studied, and the RVE model of glass fiber homogenization is established, based on the Taguchi orthogonal design method. The RVE model of glass fiber reinforced composites was simulated by DIGIMAT software, and the glass fiber mass fraction was quantitatively analyzed. The effect of glass fiber length to diameter ratio (B) and glass fiber orientation Zhang Liang (C) on the mechanical properties of glass fiber reinforced composites. 2. Consider the glass fiber delamination effect in the injection molding process of glass fiber reinforced composites. Based on grey box theory and reverse engineering, glass fiber length to diameter ratio, surface thickness ratio and core thickness ratio, surface glass fiber orientation Zhang Liang are selected. The orthogonal anisotropic elastic constants of glass fiber reinforced composites PA66 / GF50 were inversely predicted by four factors affecting the rotation angle of glass fiber orientation vector, and the elastic modulus E33 was correlated with the macroscopic tensile modulus of the composites. The experimental results of Poisson's ratio U31 and Poisson's ratio U32 are compared and verified. The relative error is 0.92%, respectively. 1.82% and 2.43. 3. The glass fiber orientation of glass fiber reinforced injection molding components was studied. Based on the generalized Newtonian fluid constitutive equation, the ARD-RSC glass fiber orientation model was adopted. Considering the interaction between glass fibers, a numerical simulation method was used to predict the glass fiber orientation distribution of injection molding components. Based on the Mean Field homogenization method of composite mesomechanics. Comprehensive use of composite mesoscopic modeling, discrete homogeneous RVE model field method, injection molding processing and structural finite element analysis technology. Flow chart of anisotropic strength analysis of glass fiber reinforced injection molding components is constructed. 4. The anisotropic strength of glass fiber reinforced injection molding traction rod is simulated. The results show that the dangerous position is in good agreement with the actual failure position. On this basis, the structure of the traction rod is improved. The results show that the maximum principal stress of the middle part of the bar body is reduced by 57.18% under tensile load. The maximum principal stress under compression load is reduced by 79.25, which indicates that the through hole design of glass fiber reinforced injection molding is not conducive to improving its bearing capacity.
【學(xué)位授予單位】：湖南工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TB332

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