Abstract

Sandwich composites with nanoreinforced polypropylene core and aluminum face sheets were studied under low velocity impact using a finite element model. A three dimensional quarter model was implemented to simulate the drop weight impact response of sandwich structures. In order to consider the strain rate dependent behavior of the core and face sheets, the Johnson–Cook material model was used for both of the polypropylene and aluminum layers. Effects of the different weight ratio of nanoparticles, the core thickness and the impactor mass were studied on the impact outputs. Comparing the impact responses of the sandwich structures with different weight ratio of nanoparticles revealed that positioning a polypropylene layer with 0.5% weight ratio of graphene as the core of sandwich panel caused the minimum amounts of damage area and transverse displacement. Adding more amount of nanoparticles did not improved the mechanical response of the sandwich structures. Increasing the impactor mass caused an increase of the contact force and the contact duration. Increasing the core thickness caused a decrease of the contact duration and increase of the contact force. The finite element outputs were well validated against the experimental results.

中文翻译：

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纳米增强聚丙烯芯和铝面板的三明治复合材料低速冲击响应的有限元分析

摘要

使用有限元模型在低速冲击下研究了具有纳米增强聚丙烯芯和铝面板的三明治复合材料。实施了一个三维四分之一模型来模拟夹层结构的落锤冲击响应。为了考虑芯板和面板的应变率依赖性，Johnson-Cook材料模型用于聚丙烯和铝层。研究了不同重量比的纳米颗粒，核芯厚度和冲击器质量对冲击输出的影响。比较具有不同重量比的纳米颗粒的三明治结构的冲击响应表明，将聚丙烯层的位置设置为0。重量比为5％的石墨烯作为夹心板的核心，造成的破坏面积和横向位移最小。添加更多量的纳米颗粒并没有改善夹心结构的机械响应。冲击器质量的增加导致接触力和接触持续时间的增加。芯厚度的增加导致接触持续时间的减少和接触力的增加。相对于实验结果，有限元输出得到了很好的验证。