钛合金体心四方点阵结构压缩性能优化分析

doi:10.3901/JME.260748

机械工程学报 ›› 2026, Vol. 62 ›› Issue (14): 138-149.doi: 10.3901/JME.260748

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钛合金体心四方点阵结构压缩性能优化分析

李国举^1,2, 张越翔¹, 王晓璐^1,3, 凡瑜¹, 张昕喆^1,3

1. 郑州航空工业管理学院航空宇航学院郑州 450046;
2. 北京航空航天大学材料科学与工程学院北京 100191;
3. 郑州航空工业管理学院河南省通用航空技术重点实验室郑州 450046

收稿日期:2025-07-15 修回日期:2025-12-20 发布日期:2026-08-29
作者简介:李国举，男，1986年出生，博士，副教授，硕士研究生导师。主要研究方向为点阵结构材料轻量化设计。E-mail：liguoju@zua.edu.cn;张昕喆(通信作者)，男，1988年出生，博士，副教授，硕士研究生导师。主要研究方向为飞行器结构设计。E-mail：zxzzua@zua.edu.cn
基金资助:
国家自然科学基金(52206059)、河南省通用航空技术重点实验室开放基金(ZHKF-230202，ZHKF-240202)、河南省科技攻关(242102221028，242102231086)和郑州航空工业管理学院研究生教育创新计划基金(2025CX94)资助项目。

Optimization Analysis on the Compressive Mechanical Properties of Titanium Alloy Body-centered Tetragonal Lattice Structures

LI Guoju^1,2, ZHANG Yuexiang¹, WANG Xiaolu^1,3, FAN Yu¹, ZHANG Xinzhe^1,3

1. School of Aerospace Engineering, Zhengzhou University of Aeronautics, Zhengzhou 450046;
2. School of Materials Science and Engineering, Beihang University, Beijing 100191;
3. Henan Key Laboratory of General Aviation Technology, Zhengzhou University of Aeronautics, Zhengzhou 450046

Received:2025-07-15 Revised:2025-12-20 Published:2026-08-29

摘要/Abstract

摘要： 钛合金体心四方(Body-centered tetragonal,BCT)点阵结构具有高比强度、高比刚度以及优异的吸能特性，在航空航天轻量化承压部件上应用广泛，但在节点处容易发生断裂失效风险。为了克服BCT点阵结构在增材制造过程中因表面缺陷而引起的力学性能差异，需要对微支柱力学本构参数进行识别，以实现节点区域抗压性能的高精度仿真优化设计。采用有限元法对常规BCT点阵结构节点区域在准静态压缩下的变形失效模式进行了系统分析，并进一步针对承压性能较为薄弱的节点连接区域进行了加强结构优化，探究加强区域结构参数对点阵结构力学性能的影响。研究结果表明：在压缩过程中胞元的节点连接处为应力集中区域，并随着该区域的断裂，点阵结构呈现出斜向60°的坍塌带。当对节点处进行区域加强后，中间层胞元的最外侧节点区域因为较少的支撑而率先开裂，整体失效形式转变为横向沉降式坍塌。当节点加强区域的长度为0.8 mm、直径为0.75 mm时力学性能最优，其比弹性模量相较于常规BCT点阵结构增加了349.57%，比极限强度提升了102.26%，表明节点加强设计可显著提升点阵结构的承压性能，为航空航天领域中轻量化承压部件内部点阵结构优化提供理论依据和设计参考。

关键词: BCT点阵结构, 准静态压缩, 有限元法, 节点区域加强

Abstract: Titanium alloy body-centered tetragonal (BCT) lattice structures exhibit high specific strength, high specific stiffness, and excellent energy absorption capacity, leading to extensive applications in lightweight pressure-bearing aerospace components. However, a significant risk of fracture failure exists at the nodes. To overcome mechanical performance deviations in BCT lattice structures caused by surface defects during additive manufacturing, identification of mechanical constitutive parameters for micro-struts is required to achieve high-precision simulation and optimization design for compressive performance enhancement in nodal regions. The deformation failure modes of nodal regions in conventional BCT lattice structures under quasi-static compression are systematically analyzed using the finite element method. Strengthening design is further applied to node connection zones with relatively weak pressure-bearing capacity to investigate the influence of structural parameters in reinforced regions on mechanical properties. Results indicate that stress concentration occurs at the unit cell node connections during compression. Following fracture at these locations, a 60° diagonal collapse band forms. After reinforcing the nodal regions, the outermost nodes of intermediate-layer unit cells experience initial cracking due to reduced support, resulting in a transition of the overall failure mode to transverse subsidence collapse. Optimal mechanical properties are achieved with a reinforced node region length of 0.8 mm and diameter of 0.75 mm, exhibiting a 349.57% increase in specific elastic modulus and a 102.26% enhancement in specific ultimate strength compared to conventional BCT lattice structures, demonstrating that the node reinforcement design significantly enhances the pressure-bearing performance of lattice structures and thereby providing theoretical foundations and design references for optimizing internal lattice structures in lightweight pressure-bearing aerospace components.

Key words: BCT lattice structure, compressive mechanical properties, finite element method, nodal region strengthening

中图分类号:

O341

李国举, 张越翔, 王晓璐, 凡瑜, 张昕喆. 钛合金体心四方点阵结构压缩性能优化分析[J]. 机械工程学报, 2026, 62(14): 138-149.

LI Guoju, ZHANG Yuexiang, WANG Xiaolu, FAN Yu, ZHANG Xinzhe. Optimization Analysis on the Compressive Mechanical Properties of Titanium Alloy Body-centered Tetragonal Lattice Structures[J]. Journal of Mechanical Engineering, 2026, 62(14): 138-149.

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http://www.cjmenet.com.cn/CN/Y2026/V62/I14/138

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钛合金体心四方点阵结构压缩性能优化分析

Optimization Analysis on the Compressive Mechanical Properties of Titanium Alloy Body-centered Tetragonal Lattice Structures

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