本文選題：立體織物 + 減紗方法　； 參考：《天津工業(yè)大學(xué)》2017年碩士論文

【摘要】：本課題研究立體織物增強(qiáng)復(fù)合材料的熱傳導(dǎo)性能,立體織物外形和結(jié)構(gòu)具有可設(shè)計(jì)性,制備工藝簡(jiǎn)單,利用石英纖維織造立體織物增強(qiáng)復(fù)合材料的具有耐高溫、耐侵蝕、抗熱沖擊和透微波等特點(diǎn),可滿足在一定外界環(huán)境下保護(hù)天線罩的作用。立體織物作為增強(qiáng)材料領(lǐng)域的后起之秀,其編織參數(shù)和結(jié)構(gòu)對(duì)材料熱傳導(dǎo)性能的影響研究有待進(jìn)一步細(xì)化。本課題以石英纖維和環(huán)氧樹(shù)脂為原料,采用熱常數(shù)分析儀TPS2500S,通過(guò)實(shí)驗(yàn)方法分析比較纖維體積分?jǐn)?shù)、內(nèi)部編織角等工藝參數(shù)以及不同減紗方法和織物結(jié)構(gòu)對(duì)立體織物增強(qiáng)復(fù)合材料熱傳導(dǎo)性能的影響,得到了一些有意義的研究結(jié)論。這些結(jié)論為立體織物增強(qiáng)復(fù)合材料在熱傳導(dǎo)方面的設(shè)計(jì)應(yīng)用和理論研究提供必要的依據(jù),其主要結(jié)論如下:三維編織復(fù)合材料的導(dǎo)熱系數(shù)與纖維體積分?jǐn)?shù)正相關(guān),隨著纖維體積分?jǐn)?shù)從45%增大到60%,三維五向編織復(fù)合材料的軸向?qū)嵯禂?shù)從13.9%提高到21.9%,其徑向?qū)嵯禂?shù)從15.6%提高到23.5%;在纖維體積分?jǐn)?shù)為50%的情況下,當(dāng)編織角從20°提高到30°,復(fù)合材料的徑向?qū)嵯禂?shù)提高了20%,而其軸向?qū)嵯禂?shù)減小了 18%,三維編織復(fù)合材料熱傳導(dǎo)性能沿著軸向和徑向呈現(xiàn)出各向異性,編織角越小各向異性越明顯;減紗能降低三維編織復(fù)合材料的熱傳導(dǎo)性能,其中集中減列的影響最明顯,軸向和徑向分別降低了 3.2%和3%,減細(xì)度的影響效果不是很顯著,軸向和徑向分別降低了 1.5%和1.0%。在相同纖維體積分?jǐn)?shù)情況下,三維編織復(fù)合材料的熱傳導(dǎo)性能低于層合及2.5D復(fù)合材料的熱傳導(dǎo)性能。其中3D5d編織復(fù)合材料的軸向熱傳導(dǎo)性能比3D4d和3D6d好,其徑向熱傳導(dǎo)性能則低于3D4d和3D6d編織復(fù)合材料;2.5D復(fù)合材料的熱傳導(dǎo)性能在軸向及徑向均高于層合復(fù)合材料。采用編織紗為六邊形,軸紗為八邊形的單胞模型來(lái)模擬3D5d編織復(fù)合材料的紗線交織情況,探索采用LBM方法和"半格劃分方案"來(lái)預(yù)測(cè)3D5d復(fù)合材料導(dǎo)熱系數(shù)。通過(guò)本文的研究,為該類材料的工藝選擇、性能設(shè)計(jì)、結(jié)構(gòu)優(yōu)化等奠定了基礎(chǔ),推動(dòng)三維編織復(fù)合材料在航空航天領(lǐng)域的進(jìn)一步應(yīng)用。
[Abstract]:In this paper, the thermal conductivity of three-dimensional fabric reinforced composites is studied. The shape and structure of three-dimensional fabric are designable, the preparation process is simple, and the three-dimensional fabric reinforced composite made of quartz fiber has high temperature resistance and corrosion resistance. The characteristics of thermal shock resistance and microwave permeation can satisfy the protection of radome in certain external environment. As a rising star in the field of reinforcements, the effects of braiding parameters and structures on the thermal conductivity of the materials need to be further refined. In this paper, quartz fiber and epoxy resin were used as raw materials, and TPS 2500S was used to analyze and compare the volume fraction of fiber by experimental method. The effects of weaving angle, yarn reducing methods and fabric structure on the thermal conductivity of three-dimensional fabric reinforced composites have been studied in this paper. These conclusions provide a necessary basis for the design, application and theoretical study of three-dimensional fabric reinforced composites. The main conclusions are as follows: the thermal conductivity of three-dimensional braided composites is positively correlated with the fiber volume fraction. With the increase of fiber volume fraction from 45% to 60%, the axial thermal conductivity of three-dimensional five-direction braided composites increases from 13.9% to 21.9%, and the radial thermal conductivity increases from 15.6% to 23.5%, and when the fiber volume fraction is 50%, When the braiding angle is increased from 20 擄to 30 擄, the radial thermal conductivity of the composites increases by 20 and the axial thermal conductivity decreases by 18. The thermal conductivity of the three dimensional braided composites exhibits anisotropy along the axial and radial directions. The smaller the braiding angle is, the more obvious the anisotropy is, the smaller the yarn is, the lower the thermal conductivity of 3D braided composite is, and the more obvious the effect of concentrated reduction is, the axial and radial decreases are 3.2% and 3% respectively, the effect of fineness reduction is not obvious. Axial and radial decreases of 1.5% and 1.0%, respectively. Under the same fiber volume fraction, the thermal conductivity of 3D braided composites is lower than that of laminated composites and 2.5D composites. The axial heat conduction property of 3D5d braided composite is better than that of 3D4d and 3D6d, while the radial heat conduction property of 3D4d and 3D6d braided composite is lower than that of 3D4d and 3D6d braided composite. The axial and radial thermal conductivity of 3D5d braided composite is higher than that of laminated composite. A unit cell model with hexagonal and octagonal yarns was used to simulate the interleaving of 3D5d braided composites. The LBM method and the semilattice scheme were used to predict the thermal conductivity of 3D5d composites. The research in this paper lays a foundation for the process selection, performance design and structure optimization of this kind of materials, and promotes the further application of 3D braided composites in the field of aerospace.
【學(xué)位授予單位】：天津工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TB332

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