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Thermal and mechanical analysis of carbon foam.

機譯：碳泡沫的熱力學(xué)分析。

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摘要

Carbon foams are porous materials which are attractive for many engineering applications because their thermal and mechanical properties can be customized by varying manufacturing process parameters. However, a highly random geometry at pore level makes it very difficult to analyze the properties and the behavior of this material in an application. Published research work on the analysis of foams has employed various ideal geometries to approximate the pore microstructure. However, these models are unable to predict accurately the foam properties and behavior in engineering applications.;The objective of this research work is to determine thermal and mechanical properties of carbon foam on the basis of its true microstructure. A new approach is proposed by creating a three dimensional (3D) solid model based on an accurate representation of the real geometry of carbon foam. Finite element models are then developed to investigate the bulk thermal and mechanical properties of carbon foam using the three dimensional solid model.;On the basis of the true 3D model of carbon foam, a study is undertaken to examine the effect of the unique microstructure on the flow field within the foam pores and the resultant convective heat transfer. A finite volume model is developed using the accurate representation of carbon foam microstructure inside a flow channel. The fluid flow and heat transfer is simulated to evaluate pressure drop and heat transfer capabilities. The carbon foam permeability, inertial coefficient and friction coefficient are determined and found to be in good agreement with experimental and semi-empirical models. The results also show a large enhancement in the heat transfer due to the presence of carbon foam in the channel. These results are comparable to the experimental results available in published literature.;Another application that has been analyzed in this study is the use of carbon foam as tooling material for manufacturing advanced composite materials. Finite element simulations are carried out to predict the process induced residual stresses and deformations when a composite part is manufactured on conventional tooling versus carbon foam tooling. The results show that both the lower coefficient of thermal expansion and the elastic modulus of carbon foam contribute to the reduction of residual stress and deformation of the composite part.
機譯：碳泡沫是多孔材料，對許多工程應(yīng)用有吸引力，因為它們的熱和機械性能可以通過改變制造工藝參數(shù)來定制。然而，在孔隙水平高度隨機的幾何形狀使得很難在應(yīng)用中分析這種材料的特性和行為。已發(fā)表的有關(guān)泡沫分析的研究工作已經(jīng)采用了各種理想的幾何形狀來近似孔隙微結(jié)構(gòu)。但是，這些模型無法準(zhǔn)確預(yù)測工程應(yīng)用中的泡沫特性和行為。本研究的目的是基于碳泡沫的真實微觀結(jié)構(gòu)確定其熱和機械性能。通過基于碳泡沫真實幾何形狀的精確表示創(chuàng)建三維（3D）實體模型，提出了一種新方法。然后使用三維實體模型開發(fā)有限元模型以研究碳泡沫的整體熱和機械性能。在真實的碳泡沫3D模型的基礎(chǔ)上，進(jìn)行研究以研究獨特的微觀結(jié)構(gòu)對碳泡沫的影響。泡沫孔內(nèi)的流場和對流換熱。使用流道內(nèi)碳泡沫微結(jié)構(gòu)的精確表示，開發(fā)了有限體積模型。模擬流體流動和傳熱，以評估壓降和傳熱能力。確定了碳泡沫的滲透性，慣性系數(shù)和摩擦系數(shù)，并與實驗?zāi)Ｐ秃桶虢?jīng)驗?zāi)Ｐ臀呛狭己?。結(jié)果還表明，由于通道中碳泡沫的存在，傳熱大大增強。這些結(jié)果可與已發(fā)表的文獻(xiàn)中的實驗結(jié)果相媲美。本研究中分析的另一個應(yīng)用是使用碳泡沫作為制造先進(jìn)復(fù)合材料的工具材料。進(jìn)行有限元模擬以預(yù)測當(dāng)使用常規(guī)工具與碳泡沫工具制造復(fù)合零件時過程引起的殘余應(yīng)力和變形。結(jié)果表明，較低的熱膨脹系數(shù)和碳泡沫的彈性模量均有助于減少復(fù)合材料的殘余應(yīng)力和變形。

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  • 作者

    Anghelescu, Mihnea S.;

  • 作者單位

    Ohio University.;

  • 授予單位 Ohio University.;
  • 學(xué)科 Engineering Materials Science.
  • 學(xué)位 Ph.D.
  • 年度 2009
  • 頁碼 122 p.
  • 總頁數(shù) 122
  • 原文格式 PDF
  • 正文語種 eng
  • 中圖分類 工程材料學(xué);
  • 關(guān)鍵詞

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