基于耐撞性的碳纤维/聚丙烯泡沫夹芯板结构优化研究

针对汽车轻量化和耐撞性要求,制备了一种碳纤维/聚丙烯泡沫夹芯板复合结构,结合试验与仿真分析,研究该夹芯板的相关力学性能;对上下面板厚度、夹芯泡沫厚度和密度进行多目标优化,获得泡沫厚度和密度的最优方案;将该结构应用于某汽车顶盖,对夹芯泡沫的分布进行变密度拓扑优化,在保证吸能特性的前提下减轻质量;对该车顶部进行压溃仿真的结果表明,优化后夹芯板汽车顶盖的结构刚度和吸能性能明显提高,且质量大幅减轻,满足了汽车耐撞性和轻量化要求。

Study on Crashworthiness Optimization of Carbon-fiber Sandwich Panel Structure with Polypropylene Foam Core

In view of the requirements of vehicle lightweight and crshworthiness,a carbon fiber sandwich panel composite structure with polypropylene foam core is manufactured,tested and simulated to study its mechanical performance.Then a multi-objective optimization is carried out on the thickness of facial sheets and foam core and the density of foam core to get the optimum scheme of thickness and density.Finally,the structure is applied to a car roof,with a topology optimization based on desity method conducted on the distribution of foam core for reducing roof mass while assuring its energy-absorbing characteristics.The results of roof crush test show that the stiffness and energy absorption performance of the car roof structure with optimized sandwich panel are obviously improved with a significant reduction in mass,meeting the crashworthiness and lightweight requirements of the vehicle.