新型梯度连续可控夹层板抗冲击性能研究及优化

RESEARCH AND OPTIMIZATION OF IMPACT RESISTANCE OF NOVEL GRADIENT CONTINUOUS CONTROLLABLE SANDWICH PANELS

研究了一种基于空间填充设计方法与二维泰森多边形方法的梯度连续可控夹层结构的设计方法.通过控制形核点的分布函数,实现夹层结构面内相对密度的径向梯度分布且环向均匀分布,进而对结构的抗冲击性能进行调控设计.利用6061O铝合金加工制备了不同面板厚度的梯度夹层板进行落锤冲击实验,并采用Abaqus/Explicit软件建立了三维有限元分析模型,实验结果和数值模拟结果有较好的一致性.通过实验观测与数值模拟得到梯度夹层板在低速局部冲击载荷作用下的变形机制,基于理想刚塑性金属材料本构建立了低速局部冲击载荷作用下面内梯度夹层板动态响应的理论分析模型,分析了面板与芯层的变形模式与吸能机理.对形核点分布函数特征参数进行了分析,得到了形核点分布函数对梯度夹层板抗冲击性能的影响规律,阐明了特征参数对力学性能的调控机制.以特征参数为设计变量,以低速局部冲击载荷作用下梯度夹层板的抗冲击性能为优化目标,建立多目标优化问题,利用试验设计方法、代理模型技术及多目标遗传算法求解得到Pareto解集,并利用最小距离选择法得到了综合最优解.验证了梯度连续可控夹层结构的设计方法是可行且有效的.

In this paper,a novel method based on the space-filling design method and the 2D-Voronoi method was studied to design the in-plane gradient continuous controllable sandwich structures.In this method,the radial gradient distribution of the relative density in the sandwich structure plane was realized by controlling the distribution function of the sites,and the impact resistance of the sandwich structure was designed.The gradient sandwich panels with different face sheet thicknesses were fabricated by the 6061O Aluminum alloy for drop weight impact experiments,and a 3D finite element analysis model was established by Abaqus/Explicit,and the numerical simulation results were in good agreement with the experimental results.Based on the deformation mechanism of the gradient sandwich panels under low-velocity localized impact loading obtained by experiments and simulations,a theoretical analysis model of the dynamic response of the gradient sandwich panel under low-velocity localized impact loading was established based on the ideal rigid plastic metal material,and the deformation mode and energy absorption mechanism of the panel and core layer were analyzed.The parameters of the distribution function of the sites were analyzed,the influence of the distribution function on the impact resistance of the gradient sandwich panel was obtained,and the regulation mechanism of the distribution function parameters on the mechanical properties was clarified.To establish the multi-objective optimization problem,the site distribution function parameters were selected as the design variables,and the impact resistance of the gradient sandwich panel under low-velocity localized impact loading as the optimization goal.Utilized the design of the experiment method,surrogate model technology,and multi-objective genetic algorithm,the Pareto set was obtained,and the optimal design was obtained by the minimum distance selection method.It was verified that the design method of gradient continuous controllable sandwich structure studied in this paper is feasible and effective.