Composite sandwich structures with a variety of core materials are increasingly utilized for wide range of structural applications. This paper presents experimental and numerical investigation on low-velocity impact response of sandwich composite panels composed of stitched foam core and E-glass fiber/Polyurethane (PU) facesheets. The samples were fabricated using low-cost vacuum assisted resin transfer molding (VARTM) process. Low velocity impact response of the sandwich panels was investigated under four different impact energy levels (10J, 15J, 20J, and 30J) using a Dynatup drop tower Instron impact machine. Based on the load and energy histories, parameters including maximum load, penetration depth, and total energy absorbed have been investigated under the four different impact energy levels listed above. A three-dimensional dynamic finite element model was developed for the stitched sandwich structures under low velocity impact.
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机译：复合夹层结构具有各种芯材的结构越来越多地用于各种结构应用。本文为缝合泡沫芯和E-玻璃纤维/聚氨酯（PU）面板组成的夹层复合板的低速冲击响应的实验性和数值研究。使用低成本真空辅助树脂转移模塑（Vartm）方法制造样品。使用Dynatup Drop Tower Instron Instron Instron机器在四种不同的冲击能级（10J，15J，20J和30J）下研究了夹层面板的低速冲击响应。基于负载和能量历史，在上面列出的四种不同的冲击能级下，已经研究了包括最大负载，穿透深度和吸收的总能量的参数。为低速冲击下的缝合夹层结构开发了三维动态有限元模型。
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