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首页> 外文会议>International Conference on Recent Advances in Space Technologies >In-Plane Quasi-Static Crushing Finite Element Analysis of Auxetic Lattices
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In-Plane Quasi-Static Crushing Finite Element Analysis of Auxetic Lattices

机译：助燃格平面内准静态破碎有限元分析

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Impact phenomenon is significant for our lives. It can be encountered in many fields. The critical areas are debris impact in space, bird striking on aircraft, ballistic and traffic accidents. For preventing the effect of impacts, some engineering structures are improved and used recently. These structures are used to absorb impact energy by avoiding the transfer of the high magnitude of the load which risks human life and essential part of vehicles that stems from the impact. For road vehicles, crush tubes are used for this purpose. However, they are not efficient, so that tube filling materials are used. Integration of filling materials to tubular systems shows a positive effect on the performance. However, in the case of impact, the impact load crushes the filling material, and filling materials expand laterally. This expansion pushes the boundary of tubular systems and causes bending moment in addition to the uniaxial compressive load at the tubular systems. Auxetic materials which expand laterally under tensile loads and shrink under compressive loads can prevent this incident. Auxetic materials exist in two forms. One of them is a foam form, and the other of them are lattices form. In this study, auxetic lattices are crushed with quasi-dynamic loads to determine their crush efficiencies. Re-entrant, anti-tetrachiral, chiral circular, chiral hexagonal auxetic structures are crushed with 10 mm/min velocity. Specific energy absorption (SEA)values are calculated for each other and compared.
机译：冲击现象对我们的生活至关重要。它可以在许多领域遇到。关键区域是碎片撞击太空，鸟类撞击飞机，弹道和交通事故。为了防止冲击的影响，最近对一些工程结构进行了改进和使用。这些结构用于避免高强度负载的转移，从而吸收冲击能量，而高负载却可能危及人类的生命，并避免了因碰撞而导致的车辆重要部件的危险。对于道路车辆，为此使用了压碎管。但是，它们效率不高，因此需要使用管填充材料。填充材料与管状系统的集成显示出对性能的积极影响。但是，在发生冲击的情况下，冲击载荷会压碎填充材料，并且填充材料会横向膨胀。这种膨胀推挤了管状系统的边界，并在管状系统的单轴压缩载荷之外还引起了弯矩。在拉伸载荷下横向膨胀并在压缩载荷下收缩的辅助材料可以防止这种情况的发生。辅助材料以两种形式存在。其中一个是泡沫形式，另一个是格子形式。在这项研究中，将准动态载荷压扁了膨胀格，以确定其压扁效率。以10 mm / min的速度压碎折返的，反四手性，手性圆形，手性六角形膨胀结构。相互计算比能量吸收（SEA）值并进行比较。

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