基于云理论的热解炭基C/C复合材料微观结构-力学性能量化关系研究

项目名称： 基于云理论的热解炭基C/C复合材料微观结构-力学性能量化关系研究

项目编号： No.51472203

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 一般工业技术

项目作者： 齐乐华

作者单位： 西北工业大学

项目金额： 85万元

中文摘要： 本项目针对C/C复合材料微观结构表征的不确定性、力学性能数据的分散性以及难以建立其量化关系的国际性难题，提出将云理论的基本思想引入到C/C复合材料微观结构表征和力学性能预测中，借助云理论对定性概念和定量变量间的不确定性转换功能解决微观结构识别和力学性能表征中存在的不确定性问题。通过系统研究基于云模型的图像分割、特征信息提取、随机微观结构量化技术，PLM图像三维重构技术和力学性能数值模拟技术，确定影响C/C复合材料力学性能的主要微观结构因素；在此基础上，结合力学性能试验测试数据研究微观结构与力学性能间的云推理器的设计、隶属云向量空间的确定，模糊推理规则提取，正向和逆向云模型的构建等科学技术问题，建立微观结构-力学性能量化分析模型和云预测系统，从而实现对热解炭基C/C复合材料微观结构的量化表征及力学性能的有效预测。为推动CVI工艺的深化研究和发展以及C/C复合材料的细观设计奠定理论基础。

中文关键词： C/C复合材料；云理论；量化关系；热解炭；力学性能

英文摘要： According to the problem of the uncertainty on the characterization of C/C composites' microstructure, the dispersivity on the data of mechanical properties and the non-quantity of the analysis of the relationship between microstructure and mechanical properties, the cloud theory will be introduced into the analysis of materials' microstructure and properties in this project. A thorough research that focuses on the quantitative characterization of microstructure and credible prediction of mechanical properties will be implemented through the uncertain conversion between qualitative concept and quantitative concept. The principal factors of microstructure features that affect the mechanical properties will be determined by studying of image segment and feature information extraction methods based on cloud model, quantitative evaluation technology of random microstructure, 3D reconstruction technology and numerical simulation method of mechanical properties. On the basis, a lot of technological problems that include design of the cloud inferers, determination of the membership clouds' vector spaces, generalization of the fuzzy inference rules and construction of the forward and backward cloud models will be studied by combining the mechanical properties' test data, and then the quantitative analysis model of the relationship between microstructure and mechanical properties will be built, which provides a theory basis for improving the development of CVI preparation technology and designing of the microstructure of C/C composites. It means that the quantitative characterization of microstructure and valid prediction of mechanical properties will be achieved to the C/C composites.

英文关键词： carbon/carbon composites;cloud theory;quantitative relationship;pyrocarbon;mechanical properties