摘要
典型的头盔是由一层聚苯乙烯(EPS)泡沫作为内衬,为了改变头盔结构及改善吸收能量的能力,内衬局部出现了由EPS和铝蜂窝两层材料作为内部衬垫的新颖头盔以吸收能量。为研究此头盔的缓冲性能,基于EPS宏观三维可压缩本构关系与蜂窝薄壁壳结构,建立了头部-泡沫-铝蜂窝系统三维有限元模型。然后以EPS的密度、厚度,与蜂窝结构的胞元边长和厚度为设计变量,以比吸收能量最大为优化目标,得到对应的目标优化函数。最后运用响应面方法对此三维有限元结构进行优化设计,结果表明泡沫-蜂窝复合缓冲结构具有较好的吸收能量的能力,并有良好的适应性,为层状缓冲系统的冲击响应与产品开发提供了参考。
A two-layered cushioning structure made of expanded polystyrene （EPS） and Aluminum honeycomb has emerged to alter the helmet structure and improve the capability of energy-absorbing, while in typical helmet structure, only one-layered EPS as cushion is utilized. Based on the crushable foam constitutive relationship and the thin-wall honeycomb structure, the head-EPS-honeycomb finite element model is established to evaluate the cushioning properties of the new helmet. Then, the maximum specific energy-absorption function is defined as the objective function of the optimization formulation. And the den- sity, the thickness of the foam, and the thickness and ledge of the honeycomb are the design variables. Finally, response sur- face method （RSM） is adopted to analyze the complex finite element model. The numerical results show that the two-layered cushioning structure made of EPS and Aluminum honeycomb has better cushioning behaviors than that of single EPS, which provides a good foundation for the development of the new helmet.
出处
《振动工程学报》
EI
CSCD
北大核心
2016年第5期900-904,共5页
Journal of Vibration Engineering
基金
国家自然科学基金资助项目(11402232)
宁波市自然科学基金资助项目(2015A610092)
关键词
聚苯乙烯泡沫
铝蜂窝
头盔
本构关系
优化设计
expanded polystyrene
Aluminum honeycomb
helmet
constitutive relationship
optimization design
