基于Weaire-Phelan结构的Ti6Al4V多孔支架力学性能研究及数值模拟
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国家自然科学基金面上项目(81973872),江苏省自然科学基金青年基金项目(BK20190309)


Mechanical Characterization and Numerical Simulation of the Ti6Al4V Porous Scaffolds Based on Weaire-Phelan Structure
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    摘要:

    目的 研究基于lattice Weaire-Phelan(LWP)结构支架的力学性能,并利用有限元方法精确模拟多孔支架的整个压缩过程。方法 采用选择性激光熔融(selective laser melting,SLM)技术制造具有不同孔隙率的Ti6Al4V(TC4)多孔支架。通过单轴压缩试验测试样件力学属性,并与人体骨骼及其他支架结构进行对比。验证4种材料模型对多孔支架压缩仿真结果 的影响。结果 LWP支架展现出与人体松质骨十分接近的弹性模量以及高于大多数皮质骨的屈服强度。与其他支架结构相比,LWP支架具有几乎最小的弹性模量和最大的屈服强度。利用本文提出的材料模型,即Johnson-Cook本构模型和动态几何应变失效模型(Johnson-Cook constitutive model and failure model based on dynamic geometric strain,JCDG),模拟出的结果 与试验数据非常接近。结论 作为骨修复材料,LWP支架展现出比其他支架结构更优秀的力学性能。与其他材料模型相比,JCDG更有利于构建出合理的多孔支架压缩仿真模型。

    Abstract:

    Objective To study mechanical properties of porous scaffolds with lattice Weaire-Phelan (LWP) structure and precisely simulate the whole process of compression test using finite element method. Methods The Ti6Al4V (TC4) porous scaffolds with different porosities were manufactured by selective laser melting (SLM) technology, and their mechanical properties were measured by uniaxial compressive tests, and compared with those of human bones and porous scaffolds with other cellular structures. Four types of material models were verified for their effects on the simulation of porous scaffold compression. Results LWP samples presented the elastic modulus close to that of human cancellous bone and significantly higher yield strength than that of cortical bone in most parts of human body. Compared with other scaffold structures, LWP samples exhibited the lowest elastic modulus and highest yield strength. The simulated results derived from the proposed material model in this study, namely, Johnson-Cook constitutive model and failure model based on dynamic geometric strain (JCDG), were proved very consistent with the experimental data. Conclusions LWP scaffolds as the bone repair biomaterials exhibite more excellent mechanical properties than the scaffolds with other structures. JCDG is more beneficial for establishing the reasonable simulation model of porous scaffolds compression, compared with other reported material models.

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郝明仲,占智勇,魏成建,葛云.基于Weaire-Phelan结构的Ti6Al4V多孔支架力学性能研究及数值模拟[J].医用生物力学,2021,36(6):841-848

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  • 收稿日期:2021-02-03
  • 最后修改日期:2021-03-16
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  • 在线发布日期: 2021-12-23
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