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

doi:10.3901/JME.260748

Abstract

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

CLC Number:

O341

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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URL: http://www.cjmenet.com.cn/EN/10.3901/JME.260748

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

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