三维纺织复合材料多尺度耦合的湿热老化研究

项目名称： 三维纺织复合材料多尺度耦合的湿热老化研究

项目编号： No.11272147

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 周储伟

作者单位： 南京航空航天大学

项目金额： 82万元

中文摘要： 拟针对高分子基三维纺织复合材料(3D-PMTC)的湿热老化问题，逐级耦合地建立3D-PMTC的基体相、微观纤维束单丝尺度、细观周期编织结构尺度、宏观板梁工程部件尺度的吸湿模型和包含湿热化学、物理机制的损伤力学模型，并将上述各尺度模型嵌入FE软件中。对3D-PMTC（包括基体和同材料体系的单向复合材料）进行湿热老化试验研究，观测其化学物理特征参数、微观形貌与力学性能的老化演变，探寻有效的老化表征方法。从理论、数值和试验方面全面研究3D-PMTC各尺度上湿热老化的机理和发展规律，验证理论模型。初步提出3D-PMTC实验室加速湿热老化的评估方法。主要创新有:1.多尺度耦合的3D-PMTC老化研究是首次；2.微细观损伤与吸湿、溶胀等过程的相互影响尚少有模型研究；3.复合材料损伤力学中同时引入化学和物理状态参数，比现有模型更全面；4.将梯度的(湿热)边界条件引入胞元模型是对胞元方法的发展。

中文关键词： 三维纺织复合材料；老化；湿热；多尺度耦合；

英文摘要： The proposed research project is to investigate hygrothermal aging for 3D polymer matrix textile composites (3D-PMTC) using a coupled multi-scale and coupled chemo-physical-mechanical method. As the first step, a theoretical framework will be established, which incorporates the effects of moisture absorption, chemical reaction, physical state changing and the consequential mechanical property degradation of polymer matrix. Based upon this framework, unit cell FE models and mathematical homogenization will be pursued at micro-scale (individual fiber srrounded in matrix) and at meso-scale (periodic braided tow architecture) respectively to investigate the mechanisms and evolutions of hydrothermal aging in these two scales. The further objective is to deliver a macro-scale theoretical hygrothermal aging model applicable to the analyses of engineering structures, such as beams and plates. As a part of the proposed project, a series of hygrothermal experiments are to be designed and conducted on polymer matrix, unidirectional composites and 3D-PMTCs, respectively. The mechanical properties and chemical and physical properties will be characterized and measured under various hygrothermal conditions and exposure durations. The microscopy will be taken on the surface and failure surface of specimen to observe signs of m

英文关键词： 3D textile composites；aging；hygrothermal；multi-scale coupled；