轻量化异构三维点阵融合设计及界面力学性能分析

Design of Lightweight Multi-Lattice Structure and Mechanical Property Analysis of Transition Boundaries

基于异构三维点阵的融合设计方法有望为航空结构的减重增效带来全新途径。针对现有的异构点阵结构设计方法在过渡边界存在极小杆径、拓扑不连续、承载能力弱等问题,提出了基于子结构参数调控的异构三维点阵过渡界面优化设计策略,通过调节不同点阵构型过渡区域的连通性,实现了异构点阵融合边界的几何高阶连续优化。以此为基础,进一步分析了不同排列模式对异构点阵结构变形行为和承载能力的影响规律,建立了异构点阵结构几何参数–性能的理论预测模型。试验结果表明,相较于传统异构点阵设计方法,本文提出的方法结构强度提升52.2%。此外,合理的界面形态能够有效传递载荷,避免结构在界面处发生灾难性破坏。

The fusion design method based on multi-lattice is expected to bring a new approach to weight reduction and increase performance of aerial structures.The existing design methods of multi-lattice structure have some problems,such as very small rod diameter,topology discontinuity and weak bearing capacity.An optimal design strategy of multi-lattice transition interface based on substructure parameter regulation was proposed.By adjusting the connectivity of transition region of different lattice configurations,the geometric high-order continuous optimization of multi-lattice transition boundary was realized.On this basis,the influence of different arrangement modes on deformation behavior and load-bearing capacity of multi-lattice structure was further analyzed,and the theoretical prediction model of geometric parameters-performance of multi-lattice structure was established.Experimental results show that compared with the traditional multi-lattice design method,the structural strength of the proposed method is improved by 52.2%.In addition,reasonable interface morphology can effectively transfer load and avoid catastrophic failure of the structure at the interface.