报告题目：复合材料车辆结构的耐撞性预测

报告人：肖欣然 教授

时  间：2024年5月8日（星期三）15:00-17:00

主持人：黄志超 副校长

地  点：教40栋204会议室

报告人简介：

肖欣然教授是密歇根州立大学机械工程系教授、密歇根州立大学复合材料车辆研究中心成员。在布鲁塞尔自由大学 (VUB) 获得博士学位，在北京航空航天大学 (BUAA) 获得学士和硕士学位。曾在加拿大蒙特利尔康考迪亚大学（1988-99）和通用汽车公司（1999-2008）工作。在通用汽车公司工作期间对车辆复合材料、塑料和粘合剂的耐撞性预测进行了相关研究，研究重点是对不同负载条件下的材料机械行为和结构响应进行数值模拟，包括冲击、碰撞、疲劳、蠕变、热、扩散以及锂离子电池制造过程中的应力分析与多物理场。(https://www.egr.msu.edu/~xinran/)

Xinran (Sharon) Xiao is a Professor of Mechanical Engineering at Michigan State University, a member of the MSU Composite Vehicle Research Center, and a Fellow of the American Society for Mechanical Engineers (ASME). She received PhD from the Free University of Brussels (VUB), BS and MS from Beihang University (BUAA). She worked at Concordia University, Montreal Canada (1988-99) and General Motors Corporation (1999-2008). At GM, she supported crashworthiness predictions of composites, plastics and adhesive bonded vehicle structures. Xiao’s research is focused on modeling of mechanical behaviors of materials and structural responses under different loading conditions using finite element (FE) simulations, including impact, crash, fatigue, creep, thermal, diffusion, and during manufacturing, and stress analysis of lithium ion batteries with Multiphysics. (https://www.egr.msu.edu/~xinran/)

报告摘要：

车辆结构可分为两大类：车身覆盖件和主要结构。车身覆盖件包括车门、发动机罩、车顶板、翼子板等所有封闭件。主要结构包括底盘、立柱、门梁、泵梁、车身底部等。纤维增强聚合物复合材料已广泛应用于车身覆盖件。然而，它们在初级结构中的应用相当有限。缺乏对复合材料结构碰撞能量吸收（EA）的可靠预测是关键因素之一。

材料的 EA 能力通常通过管状结构的轴向冲击来评估。该载荷工况对于碰撞盒、前纵梁和摇臂的设计非常重要。航空航天工业在直升机的转向柱和起落架以及飞机的机身底层地板的设计中也对轴向碰撞感兴趣。复合材料表现出比金属更高的比能吸收 (SEA)。复合材料结构的高SEA归因于这种广泛的损伤和断裂过程。为了预测复合材料结构的EA性能，材料模型必须能够描述材料的整个损伤和断裂过程。这一要求将复合材料碰撞模拟的材料模型与其他应用的材料模型区分开来。在本次演讲中，将介绍复合结构 EA 预测的最新进展。

Vehicle structures can be divided into two broad categories: body panels and primary structures. Body panels include all closures such as doors, hood, roof panel, fender, etc. The primary structures include chassis, pillars, door beam, pumper beam, underbody, and etc. Fiber reinforced polymer composites have been widely used in vehicle body panels. However, their applications in primary structures are rather limited. The lack of reliable predictions for crash energy absorption (EA) of composite structures is one of the key factors.

The EA capability of a material is commonly evaluated with axial impact of tubular structures. This load case is important to the design of crash box, front rail and rockers. Axial crash is also of interest of aerospace industry in the design of steering column and landing gears of helicopters, and fuselage sub-floors of aircrafts. Composites exhibit much higher specific energy absorption (SEA) than metals. The high SEA of composite structures is attributed to this extensive damage and fracture process. To predict the EA performance of composite structures, the material model must be able to describe the entire damage and fracture process of the material. This requirement sets the material models for crash simulations of composites apart from those for other applications. This talk will present recent developments aimed at EA prediction of composite structures.  

欢迎感兴趣的师生参加！

轨道交通基础设施性能监测与保障国家重点实验室

2024年4月29日