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Thermal and mechanical analysis of carbon foam.

机译：碳泡沫的热力学分析。

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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.
机译：碳泡沫是多孔材料，对许多工程应用有吸引力，因为它们的热和机械性能可以通过改变制造工艺参数来定制。然而，在孔隙水平高度随机的几何形状使得很难在应用中分析这种材料的特性和行为。已发表的有关泡沫分析的研究工作已经采用了各种理想的几何形状来近似孔隙微结构。但是，这些模型无法准确预测工程应用中的泡沫特性和行为。本研究的目的是基于碳泡沫的真实微观结构确定其热和机械性能。通过基于碳泡沫真实几何形状的精确表示创建三维（3D）实体模型，提出了一种新方法。然后使用三维实体模型开发有限元模型以研究碳泡沫的整体热和机械性能。在真实的碳泡沫3D模型的基础上，进行研究以研究独特的微观结构对碳泡沫的影响。泡沫孔内的流场和对流换热。使用流道内碳泡沫微结构的精确表示，开发了有限体积模型。模拟流体流动和传热，以评估压降和传热能力。确定了碳泡沫的渗透性，惯性系数和摩擦系数，并与实验模型和半经验模型吻合良好。结果还表明，由于通道中碳泡沫的存在，传热大大增强。这些结果可与已发表的文献中的实验结果相媲美。本研究中分析的另一个应用是使用碳泡沫作为制造先进复合材料的工具材料。进行有限元模拟以预测当使用常规工具与碳泡沫工具制造复合零件时过程引起的残余应力和变形。结果表明，较低的热膨胀系数和碳泡沫的弹性模量均有助于减少复合材料的残余应力和变形。

著录项

  • 作者

    Anghelescu, Mihnea S.;

  • 作者单位

    Ohio University.;

  • 授予单位 Ohio University.;
  • 学科 Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 122 p.
  • 总页数 122
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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