Abstract Low-velocity drop weight impact experiments of plain-woven Twaron® CT 612 at an impact energy of 15, 20, 30 J are carried out on a 9250HV drop weight impact tester. Specially treated specimens are designed and used to deal with boundary conditions because the fabric is too flexible and cannot be fixed precisely. Experimental results reaffirm that TwaronⓇ is an impact-rate-sensitive material and that a greater initial impact energy resulted in a larger breaking load, greater failure strain, larger energy absorption and shorter contact duration to the fabric in the impact process., The commercial code ANSYSⓇ-AUTODYN is employed for impact FE analysis on a physically based impact model which is designed basing on the fabric's geometry parameters and the experimental set-up. The dynamic mechanical parameters of TwaronⓇ is analyzed and applied to FE model to describe the rate-sensitive mechanical properties through a three-element spring-dashpot model. Standard earth gravity is applied to the impact model to reflect the impact process realistically as well. The results indicate that a remarkably close agreement is obtained between the simulation and experimental results in various impact scenarios. Thus, the energy absorption mechanisms and stress distributions during the impact process are clarified. The influence of specimen shape and size are also analyzed systemically. These results indicate that the present experimental set-up and the developed fabric geometry model are effective at investigating many additional mechanical problems in textile fabrics and/or flexible material structures.

中文翻译：

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使用实验和数值模拟研究 Twaron® 织物的低速落锤冲击行为

摘要 在 9250HV 落锤冲击试验机上进行了平纹编织 Twaron® CT 612 在 15、20、30 J 冲击能量下的低速落锤冲击试验。特殊处理的试样被设计用于处理边界条件，因为织物太灵活，不能精确固定。实验结果再次证实 TwaronⓇ 是一种冲击速率敏感材料，更大的初始冲击能量导致更大的断裂载荷、更大的破坏应变、更大的能量吸收和更短的冲击过程中与织物的接触时间。代码 ANSYSⓇ-AUTODYN 用于基于物理冲击模型的冲击有限元分析，该模型是根据织物的几何参数和实验装置设计的。分析了 TwaronⓇ 的动态力学参数，并将其应用于有限元模型，通过三元弹簧缓冲器模型来描述速率敏感的力学性能。标准地球重力应用于撞击模型，以真实地反映撞击过程。结果表明，在各种撞击情况下，模拟和实验结果之间获得了非常接近的一致性。因此，阐明了冲击过程中的能量吸收机制和应力分布。还系统地分析了试样形状和尺寸的影响。这些结果表明，目前的实验装置和开发的织物几何模型在研究纺织织物和/或柔性材料结构中的许多其他机械问题方面是有效的。