發(fā)布時間：2018-05-03 23:28

  本文選題：導(dǎo)熱性能 + 復(fù)合材料��； 參考：《青島科技大學(xué)》2017年碩士論文

【摘要】：由于科技的飛速發(fā)展,復(fù)合材料的導(dǎo)熱得到了廣泛的應(yīng)用,尤其填充型復(fù)合材料已經(jīng)成為了廣大學(xué)者們的研究熱點。本文通過DIGIMAT軟件得到了碳纖維填料及二元混合填充橡膠復(fù)合材料的代表體積單元模型,并通過有限元分析軟件ANSYS對復(fù)合材料模型的導(dǎo)熱性能進(jìn)行數(shù)值模擬計算。主要討論了碳纖維填充量、填充個數(shù)、長徑比、彎曲度對復(fù)合材料導(dǎo)熱性能的影響;二元混合填料填充順序、填充配比及其中一種含量變化時對復(fù)合材料導(dǎo)熱性能的影響。研究表明:在不同填料添加復(fù)合材料時,由于碳纖維有明顯的各向異性,填料空間分布對復(fù)合材料導(dǎo)熱性能的影響較為明顯。碳纖維填充根數(shù)變化時復(fù)合材料熱導(dǎo)率的變化微乎其微,復(fù)合材料熱導(dǎo)率隨著碳纖維填充分?jǐn)?shù)的增大而增大,數(shù)值模擬結(jié)果與理論結(jié)果及實驗結(jié)果的變化趨勢一致;當(dāng)碳纖維含量一定時,增大碳纖維的長徑比能更好的提高復(fù)合材料的熱導(dǎo)率。對于直形碳纖維,定向填充復(fù)合材料時的熱導(dǎo)率最大。在復(fù)合材料中添加彎曲碳纖維時,其熱導(dǎo)率隨著彎曲度的增大先增大后減小。當(dāng)彎曲碳纖維長徑比變化時,擬合得到了不同區(qū)段長徑比與復(fù)合材料導(dǎo)熱性能的關(guān)系,利用擬合公式可以更好的預(yù)測不同長徑比下復(fù)合材料的熱導(dǎo)率。二元混合添加的復(fù)合材料,兩種填料的添加順序?qū)��?fù)合材料導(dǎo)熱性有一定的影響,先添加碳纖維時復(fù)合材料的熱導(dǎo)率較高;兩種填料在不同配比下,碳纖維對復(fù)合材料熱導(dǎo)率起主導(dǎo)作用,隨著碳纖維配比的增大,復(fù)合材料導(dǎo)熱性隨之增大;其中一種添加物含量一定時,復(fù)合材料熱導(dǎo)率伴隨另一種添加物含量的增加而增大。除了討論碳纖維,還探討了碳納米管添加復(fù)合材料的熱導(dǎo)率,將多壁碳納米管等效為圓柱體。碳納米管彎曲度增大,復(fù)合材料熱導(dǎo)率下降;增加碳納米管直徑提高其填充量,復(fù)合材料熱導(dǎo)率呈現(xiàn)出線性增大的趨勢。
[Abstract]:Due to the rapid development of science and technology, the heat conduction of composite materials has been widely used, especially the filled composite materials have become the research hotspot of the majority of scholars. In this paper, the representative volume element model of carbon fiber filler and binary mixed filled rubber composite is obtained by DIGIMAT software, and the thermal conductivity of the composite model is simulated by finite element analysis software ANSYS. The effects of carbon fiber filling amount, filling number, aspect ratio, bending degree on the thermal conductivity of composites were discussed, and the effects of filling sequence, filling ratio and one of them on the thermal conductivity of composites were discussed. The results show that the space distribution of carbon fiber has obvious influence on the thermal conductivity of the composites due to the obvious anisotropy of carbon fiber when the composites are added with different fillers. The thermal conductivity of the composite increases with the increase of the carbon fiber filling fraction, and the numerical simulation results are consistent with the theoretical and experimental results. When the content of carbon fiber is constant, increasing the aspect ratio of carbon fiber can improve the thermal conductivity of composites better. For straight carbon fiber, the maximum thermal conductivity is obtained when the composite is filled in directionally. When the bending carbon fiber is added into the composite, the thermal conductivity increases first and then decreases with the increase of the bending degree. When the ratio of length to diameter of bending carbon fiber changes, the relationship between the ratio of length to diameter and the thermal conductivity of composites in different regions is obtained, and the thermal conductivity of composites under different ratio of length to diameter can be better predicted by using the fitting formula. The addition order of two fillers has a certain influence on the thermal conductivity of the composites, and the thermal conductivity of the composites is higher when carbon fiber is added first, and the thermal conductivity of the composites is higher when the two kinds of fillers are added in different proportions. Carbon fiber plays a leading role in the thermal conductivity of composites, and the thermal conductivity of composites increases with the increase of carbon fiber ratio, and the thermal conductivity of the composites increases with the increase of the content of the other additives when the content of one additive is constant. In addition to carbon fiber, the thermal conductivity of carbon nanotubes (CNTs) added into composites is also discussed, and the multi-walled CNTs are equivalent to cylinders. The thermal conductivity of the composites decreases with the increase of the bending degree of carbon nanotubes, and the increase of the diameter of carbon nanotubes with the increase of the filling amount, the thermal conductivity of the composites increases linearly.
【學(xué)位授予單位】：青島科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TB332

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