Materials World Network: Multi-Scale Study of Chemical Vapor Infiltrated Carbon/Carbon Composites

主要目标是加强对复杂层次微观结构与碳/碳复合材料力学行为之间相互作用的基本理解。为了实现这一目标，将使用化学工程、无损检测和表征（偏振光显微镜、结合选定区域电子衍射的电子显微镜、微型计算机断层扫描和原子力显微镜）方法和计算力学的结合。本研究的目的是：(a)确定化学蒸汽渗透过程参数如何定义碳/碳复合材料的纳米结构和微观结构；(b)建立一个多尺度数值模型，将纳米、微观和中观水平的微观结构与材料的整体性能联系起来；(c)提出制造具有理想微观结构和机械性能的碳/碳复合材料的方法。(d)通过在规定条件下制造材料并进行微观结构表征和力学测试来验证该方法，以及(e)研究热解碳纳米结构和复合材料热处理引起的应力集中和断裂。

The main goal is to enhance fundamental understanding of the interaction between complex hierarchchical microstructure and the mechanical behavior of carbon/carbon composites. To achieve this goal a combination of chemical engineering, non-destructive testing and characterization (polarized light microscopy, electron microscopy combined with selected area electron diffraction, micro-computed tomography, and atomic force microscopy) methods, and computational mechanics will be used. The objectives of this research are (a) to determine how nanotexture and microstructure of carbon/carbon composites is defined by the parameters of chemical vapor infiltration process, (b) develop a multi-scale numerical model relating microstructure on nano-, micro-, and meso-levels to the overall material properties, (c) propose methodology for fabrication of carbon/carbon composites with desirable microstructure and mechanical properties, (d) verify the approach by manufacturing the material under the prescribed conditions and performing microstructure characterization and mechanical testing, and (e) investigate stress concentrations and fracture induced by nanotexture of pyrolytic carbon and by thermal treatment of the composite.