本文選題：波形碳納米管 + 隨機(jī)分布�。� 參考：《電子科技大學(xué)》2017年碩士論文

【摘要】：2D編織復(fù)合材料因其良好的結(jié)構(gòu)整體性、可設(shè)計(jì)性和抗沖擊等性能,成為現(xiàn)代飛行器結(jié)構(gòu)設(shè)計(jì)的重要選材之一。然而,研究表明:基體性能很大程度控制著2D紡織復(fù)合材料的關(guān)鍵力學(xué)性能。為提升和改善2D紡織復(fù)合材料力學(xué)性能,圍繞樹(shù)脂基體材料的改性和增韌研究,已成為提高2D編織復(fù)合材料綜合力學(xué)性能的重要舉措之一。目前,碳納米管因其優(yōu)異的力學(xué)特性,備受復(fù)合材料學(xué)術(shù)界和工業(yè)界高度關(guān)注,其可作為一種重要的增強(qiáng)體用于改性樹(shù)脂基體性能。因此,研究含隨機(jī)分布碳納米管樹(shù)脂基2D編織復(fù)合材料的力學(xué)性能及增韌機(jī)制,具有重要的學(xué)術(shù)價(jià)值和工程意義。本文基于均勻化等效思想和多尺度建模方法,研究了含隨機(jī)分布碳納米管樹(shù)脂基2D編織復(fù)合材料彈性性能及影響因素。首先,在納米尺度上,基于碳納米管的實(shí)體纖維等效模型和改進(jìn)的隨機(jī)順序吸附算法,建立了含隨機(jī)分布波形碳納米管增強(qiáng)樹(shù)脂基復(fù)合材料的幾何模型,基于連續(xù)介質(zhì)力學(xué)方法,發(fā)展了基于特征胞元的含碳納米管樹(shù)脂基參數(shù)化有限元模型,并結(jié)合實(shí)驗(yàn)數(shù)據(jù)驗(yàn)證了所建模型的有效性。其次,基于2D編織復(fù)合材料編織工藝,建立了2D二軸1?1編織復(fù)合材料的實(shí)體單胞參數(shù)化模型,采用均勻化等效思想,嵌入含隨機(jī)分布碳納米管樹(shù)脂基體材料等效本構(gòu),結(jié)合周期性邊界條件,建立了基于細(xì)觀胞元的2D編織復(fù)合材料彈性性能有限元分析模型,詳盡分析了含碳納米管改性樹(shù)脂對(duì)2D編織復(fù)合材料彈性性能的影響,經(jīng)與實(shí)驗(yàn)數(shù)據(jù)對(duì)比,證明了模型的合理有效性。研究發(fā)現(xiàn):當(dāng)樹(shù)脂基體中碳米管直徑為30納米、體積分?jǐn)?shù)為0.5%時(shí),2D二軸1?1編織復(fù)合材料橫向彈性性能提高了約10%~16%,其軸向彈性模量的增強(qiáng)效果與材料的編織角高度相關(guān)。最后,系統(tǒng)討論了編織角和纖維體積含量對(duì)含碳納米管2D二軸1?1編織復(fù)合材料的彈性性能的影響規(guī)律。
[Abstract]:2D braided composites have become one of the most important materials for the structural design of modern aircraft due to their good structural integrity, designability and impact resistance. However, the results show that the matrix properties largely control the key mechanical properties of 2D textile composites. In order to improve the mechanical properties of 2D textile composites, the modification and toughening of resin matrix materials have become one of the important measures to improve the comprehensive mechanical properties of 2D braided composites. At present, carbon nanotubes (CNTs) have attracted much attention in academia and industry for their excellent mechanical properties, which can be used as an important reinforcement to modify resin matrix properties. Therefore, it is of great academic value and engineering significance to study the mechanical properties and toughening mechanism of 2D braided composites containing randomly distributed carbon nanotubes resin matrix. Based on homogenization equivalence and multi-scale modeling method, the elastic properties and influencing factors of 2D braided composites with randomly distributed carbon nanotube resin matrix were studied in this paper. Firstly, based on the fiber equivalent model of carbon nanotubes and the modified random sequential adsorption algorithm, a geometric model of carbon nanotube reinforced resin matrix composites with random distribution was established. Based on the continuum mechanics method, the parameterized finite element model of carbon nanotube resin based on characteristic cell is developed, and the validity of the model is verified by the experimental data. Secondly, based on the braiding process of 2D braided composite, the solid unit cell parameterized model of 2D biaxial 1k-1 braided composite is established. The homogenization equivalent idea is adopted, and the equivalent constitutive model is embedded into the matrix material of carbon nanotube resin containing random distribution. Based on the periodic boundary conditions, a finite element model of elastic properties of 2D braided composites based on meso-cell was established, and the effect of modified resin containing carbon nanotubes on the elastic properties of 2D braided composites was analyzed in detail. Compared with the experimental data, the model is proved to be reasonable and effective. It is found that when the diameter of carbon rice tube is 30 nm and the volume fraction is 0.5 in the resin matrix, the transverse elastic properties of 2D biaxial 1 / 1 braided composites are improved by about 100.16%, and the axial elastic modulus enhancement effect is highly related to the braiding angle of the composites. Finally, the effects of braiding angle and fiber volume content on the elastic properties of 2D biaxial 1k-1 braided composites containing carbon nanotubes are systematically discussed.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TB33;O341

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本文編號(hào)：1782643