基于BCC与I-WP互穿晶格结构的多孔结构力学与渗透性能研究

Study on Mechanical and Permeability Properties of Porous Structure Based on BCC and I-WP Interpenetrating Lattice Structure

摘要: 针对传统实心螺纹支架因弹性模量过高易引发应力遮挡效应的问题，本研究设计了一种基于体心立方(BCC)与I-WP三周期极小曲面(TPMS)的互穿晶格结构，旨在降低钛合金植入体的弹性模量并提升其力学与生物传输性能。通过引入组合参数ω调控内部BCC结构在整体结构中的体积分数，构建了五种不同互穿比例的多孔结构，并采用有限元分析方法系统评估其力学承载能力与流体渗透特性。结果表明，互穿结构(ω = 0.3, 0.5, 0.8)相较于单相结构(ω = 0与ω = 1)具有更均匀的应力分布和更优的承载效率，其中ω = 0.5表现出最佳综合力学性能；在渗透性能方面，互穿结构虽流动阻力略高，但其复杂的微孔网络可增强细胞附着与物质交换能力，有利于组织再生。本研究为高性能骨组织工程支架的结构设计与优化提供了理论依据与技术参考。

Abstract: Aiming at the problem of stress shielding effect caused by the high elastic modulus of traditional solid threaded stents, an interpenetrating lattice structure based on body-centered cubic (BCC) and I-WP three-period minimal surface (TPMS) was designed in this study, the purpose is to reduce the elastic modulus of titanium alloy implants and improve their mechanical and biological transmission properties. By introducing the combination parameter ω to regulate the volume fraction of the internal BCC structure in the overall structure, five porous structures with different interpenetrating ratios were constructed, and the structure of the interpenetrating layer was analyzed, and the finite element analysis method was used to systematically evaluate their mechanical bearing capacity and fluid permeability characteristics. The results show that the interpenetrating structure (ω = 0.3, 0.5, 0.8) has more uniform stress distribution and better bearing efficiency than the single-phase structure (ω = 0 and ω = 1), where ω = 0.5 shows the best comprehensive mechanical properties In terms of permeability, although the flow resistance of the interpenetrating structure is slightly higher, its complex microporous network can enhance the ability of cell attachment and material exchange, which is conducive to tissue regeneration. This study provides a theoretical basis and technical reference for the structural design and optimization of high-performance bone tissue engineering scaffolds.