Optimization and Mechanical Performance Analysis of FCCZ Lattice Structure

This study addresses the urgent demand for high-performance materials in aerospace and other fields, exploring the dynamic compression behavior and energy absorption characteristics of a new high entropy alloy (HEA) Al_0.3NbTi₃VZr_1.5 combined with optimized lattice structures. To solve the problem of insufficient performance of traditional face centered cubic unit cell with Z-struts (FCCZ) lattice structures under complex load conditions, a geometric optimization design was conducted based on finite element analysis. The mechanical response of the structure was then systematically investigated. The results indicate that the optimized BC and BV lattice structures significantly enhance stress distribution, specific strength, and energy absorption characteristics of the material. In the optimized configuration, the BC2 type exhibits a 9% increase in specific energy absorption, demonstrating the best overall performance. Meanwhile, the BV1 type shows a 31% improvement in specific strength compared to the original structure. Additionally, the optimization design demonstrates significant sensitivity to two key parameters: aperture and variable cross-section fillet. These findings provide a theoretical basis and design reference for efficiently combining HEA with lattice structures, offering important guidance for the design and optimization of lightweight structures in aerospace, automotive manufacturing, and other fields.