3D编织复合材料整体加筋壁板结构稳定性研究

项目名称： 3D编织复合材料整体加筋壁板结构稳定性研究

项目编号： No.11302045

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 徐焜

作者单位： 电子科技大学

项目金额： 28万元

中文摘要： 3D编织复合材料整体加筋壁板作为一种新颖的轻质高效结构，具有良好的结构整体性，能克服传统层板易分层的弱点，有望提高结构损伤容限及设计许用值，以进一步减轻飞行器结构重量。研究新型整体加筋薄壁结构稳定性，是评估新结构承载能力、确保结构安全需亟待解决的关键问题之一。然而，因3D编织复合材料细观结构复杂，具有材料与结构同时成型特征，增加了将新材料应用于结构设计与分析的难度。目前，有关3D编织整体加筋壁板稳定性的研究工作还鲜有报导。本项目拟基于3D编织复合材料壁板胞元叠层结构力学模型，采用双尺度思想，提出壁板从细观材料到宏观结构的跨尺度力学建模分析方法，建立3D编织整体加筋壁板在轴压及面内剪切载荷下的的非线性屈曲分析模型，结合试验，研究3D编织整体加筋壁板的屈曲性态，阐明结构的内力分布规律及传载机制，揭示结构的非线性屈曲行为及参数影响规律，为3D编织整体加筋壁板稳定性综合优化设计与分析提供重要依据。

中文关键词： 纺织结构；加筋壁板；力学性能；屈曲；

英文摘要： To reduce the weight of the aircraft structures, as a kind of the novel lightweight structures with the good integrity, the integrally stiffened 3D braided composites panels are looking forward to being widely applied to improve the damage tolerance and design allowables for the composites structures, which can overcome the weakness of the delamination of the laminated composites due to their low interlaminar toughness and strength. Investigation of the stability of the new type of integrally stiffened thin-walled structure has become one of the key problems to be urgently solved for assessing the carrying capacity and ensuring the safety of the structure. However, since 3D braided composites are manufactured with the braided preforms by Resin Transfer Molding process, which makes the braided composites with the complicated microstructures directly become the structure at the same time. The feature of the composites makes it difficult to conduct the design and analysis of 3D braided composites sturctures. Nowadays, there are still few literatures about the stability analysis of the integrally stiffened 3D braided composites panel. In the proposal, first, a new structural model about 3D braided composites panel is presented. Based on the model, 3D braded composites panel are assumed to be composed of the upper an

英文关键词： Fabric structure；Stiffened panels；Mechanical properties；Buckling；