泡沫填充类蜂窝夹层结构的耐撞性

Crashworthiness of the foam-filled quasi-honeycomb sandwich structure

本文创新构型一种聚氨酯泡沫填充类蜂窝夹芯结构,取类蜂窝胞元壁厚分别为0.3、0.5、1.0 mm,运用数值模拟方法对该填充结构在不同冲击速度作用下的耐撞性进行了系统研究,并分析了类蜂窝胞元壁厚对结构耐撞性及变形机制的影响。结果表明,在7、14、33 m/s冲击载荷作用下,类蜂窝胞元壁厚为0.3 mm填充结构的比吸能、载荷稳定性及吸能效率要高于其他两种壁厚结构的相应值,此条件下填充结构的耐撞性最优,胞元壁厚为0.5 mm结构的耐撞性次之。对于该泡沫填充类蜂窝结构而言,减小类蜂窝胞元壁厚能显著提升结构的载荷稳定性,在相同胞元壁厚条件下,填充结构在低速载荷冲击作用下表现出了比中、高速冲击作用下更优的载荷稳定性和吸能效率。

In this paper,an innovative configuration of a polyurethane foam-filled quasi-honeycomb sandwich structure was proposed,and the applied wall thickness of the quasi-honeycomb cell was 0.3 mm,0.5 mm and 1.0 mm,respectively.The numerical simulation method was used to systematically study the crashworthiness of the foam-filled structures under different impact velocities,and the influence of the cell wall thickness on the crashworthiness and deformation mechanism of the quasi-honeycomb structure was analyzed.The results show that under the impact velocity of 7 m/s,14 m/s and 33 m/s,respectively,the specific energy-absorption,load stability,and energy absorption efficiency of the structure with the cell wall thickness of 0.3 mm are higher than those of the other two structures with the thickness of 0.5 mm and 1.0 mm.In other words,the foam-filled structure with the cell wall thickness of 0.3 mm has the best crashworthiness,followed by the structure with the cell wall thickness of 0.5 mm.For the quasi-honeycomb structure filled with foam,reducing the wall thickness of the quasi-honeycomb cell can significantly improve the load stability of the structure.Moreover,in the case of the same cell wall thickness,the foam-filled structure exhibits better load stability and energy absorption efficiency at low speed impact than at medium and high speed impacts.