基于轻量化与强度的短纤维复合材料蜂窝三明治板结构多目标优化设计

Multi-objective Optimization of Short Fiber Reinforced Composite Honeycomb Sandwich Panel Structure Based on Lightweight and Strength

蜂窝三明治板在结构轻量化中得到了广泛应用,采用具有良好材料性能的短纤维复合材料替换铝蜂窝,能进一步满足轻量化需求。为了短纤维复合材料更好地应用,针对增大蜂窝三明治板抗拉强度要求,提出了一种增大面板与蜂窝粘接面积的结构设计方案。在有限元软件ABAQUS中建立了考虑损伤退化的短纤维复合材料蜂窝三明治板有限元计算模型,验证了设计方案的可行性。为了兼顾力学性能和减重要求,采用基于代理模型和多岛遗传算法的优化方法对蜂窝结构参数进行了多目标优化。分析结果表明,所建立的精细化有限元模型能够模拟三明治板的性能突降行为,基于代理模型高效准确的优化流程,优化后三明治板的面密度相比于优化前降低了30%,强度满足要求。

Honeycomb sandwich panels is widely used in lightweight structure.In order to make further improvement on lightweight,shortfiber reinforced composite material which has good material properties can be used to manufacture honeycomb instead of aluminum.For well-applied of short fiber reinforced composite,a new structure was designed for increasing the bonding area between skin and honeycomb to enhance the flatwise tensile strength.The finite element model of short fiber reinforced composite honeycomb sandwich panel with damage degradation was established based on ABAQUS,by that the feasibility of the new design was proved.Considering the requirements of strength and weight reduction,the multi-objective optimization of honeycomb structure parameters was carried out by using the optimization method based on surrogate model and multi island genetic algorithm.The results show that the finite element model can simulate the failure behavior of sandwich panel well.And the optimization based on surrogate model is efficient and accurate.The density of optimal sandwich panel with acceptable strength is 30% lower than the original design.