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航空学院青年学术论坛第七十一讲
2017-06-14 11:32   审核人:

报告题目:编织复合材料的多尺度失效行为及其有限元模拟研究

Multi-Scale Failure Analysis and Finite Element Modeling of Textile Composites

报告人:张超教授,西北工业大学航空学院青年千人

讲座时间:616日周五上午10

讲座地点:航空楼A817

报告摘要:

Textile composites are being increasingly used in aerospace structures, due to their outstanding impact resistance and crack propagation resistance properties. Because of their complex geometry features, the failure behavior of textile composites is very complicated and raisesa lot difficulty on experimental and numerical simulation techniques. In this presentation, a multiscale modeling framework is introduced to study the failure behavior of triaxially braided composite under static and impact loads. Micromechanical model with statistically-equivalent random fiber distribution is developed to predict the effective properties of the fiber bundles. A representative meso-scale unit cell model and its finite element mesh of the composite is generated based on the realistic geometry parameters obtained through microscopic image analysis. The meso-mechanical model is then utilized to analyze the progressive failure behavior of the braided composite under different loading conditions. The developed meso-scale finite element model shows excellent correlation with experiments on global stress-strain responses and captures successfully the local damage behaviors, especially the free-edge effect and the size-dependent tensile properties. Ameso-macro subcell model is developed for impact failure simulation, captures the threshold impact velocity and fracture pattern of a triaxially braided composite panel, and analyze the internal damage distribution of fiber bundles during the impact process.

Overall, the proposed multi-scale modeling framework is an efficient method for the failure analysis of textile composites. It can also serve as a tool for virtual experiments facilitating the specimen design of experiments and structure optimization.

报告人简介:

张超,西北工业大学航空学院教授。于20082010年分别获得武汉理工大学学士、硕士学位,2013年获得美国阿克伦大学博士学位。2014年至2016年先后在美国北卡夏洛特大学和美国可再生能源国家实验室从事博士后研究工作。20169月起任西北工业大学航空学院教授。2017年入选中组部千人计划青年项目。主要从事航空复合材料结构力学行为、航空结构的冲击动力学及多尺度数值仿真等方面的研究工作。注重运用多学科交叉、实验测量与数值模拟研究相结合的方法,在编织复合材料结构的的力学行为、航空结构抗冲击仿真与设计、复合材料老化行为、边界效应与多尺度模拟、能源结构的多场耦合模型等方向取得了一系列创新性研究成果。已在国际著名学术期刊如Composites Science and TechnologyComposites Part AComposite StructuresJournal of Power SourcesMechanics of Materials等发表一系列论文。常年应邀担任相关领域顶级期刊审稿专家,多次担任国际学术会议的分会主席。20142015年均被评为Journal of Aerospace Engineering优秀审稿人,2016年获世界计算力学大会Travel Award。目前,任航空学报和Chinese Journal of Aeronautics青年编委。

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