径向梯度多孔支架设计与力学性能分析

doi:10.3901/JME.2021.03.220

机械工程学报 ›› 2021, Vol. 57 ›› Issue (3): 220-226.doi: 10.3901/JME.2021.03.220

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径向梯度多孔支架设计与力学性能分析

高芮宁, 李祥

上海交通大学机械与动力工程学院上海 200240

收稿日期:2020-02-19 修回日期:2020-05-23 出版日期:2021-02-05 发布日期:2021-03-16
通讯作者: 李祥(通信作者),男,1979年出生,博士,副研究员,博士研究生导师。主要研究方向为增材制造(3D打印)技术及应用,医疗器械(骨科植入物),生机电一体化系统。E-mail:xiangliwj@sjtu.edu.cn
作者简介:高芮宁,男,1995年出生。主要研究方向为多孔结构设计与优化。E-mail:gaoruining@sjtu.edu.cn
基金资助:
国家自然科学基金（51475293）和校医工交叉（YG2017MS60）资助项目。

Design and Mechanical Properties Analysis of Radially Graded Porous Scaffolds

GAO Ruining, LI Xiang

School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240

Received:2020-02-19 Revised:2020-05-23 Online:2021-02-05 Published:2021-03-16

摘要/Abstract

摘要： 提出一种基于Gyroid曲面的径向梯度多孔支架的设计方法。通过调节中心孔隙率P_in，边缘孔隙率P_out，和梯度变化率n设计具有相同平均孔隙率，不同孔隙变化率的径向梯度多孔支架。采用有限元法（Finite element method，FEM）分析和力学试验方法分别对径向梯度多孔支架和均质多孔支架的力学性能进行研究，并对比其性能的差异。有限元分析结果显示，在平均孔隙率相同的条件下，所设计的径向梯度多孔支架力学性能优于均质多孔支架。平均孔隙率越高，径向梯度多孔支架相对均质多孔支架的力学性能越好；力学试验结果显示，当平均孔隙率为70%时，径向梯度多孔均质多孔支架弹性模量与抗压强度分别为（2.34±0.05） GPa和（67.63±1.33） MPa，径向梯度多孔支架弹性模量与抗压强度分别为（3.96±0.19） GPa和（90.83±3.35） MPa。有限元分析与力学试验共同说明了径向梯度多孔支架比均质多孔支架性能优异。

关键词: 三周期极小曲面, 径向梯度多孔支架, 有限元法, 力学性能

Abstract: A design method based on Gyroid surface is proposed to build radially graded porous scaffolds. Radially graded porous scaffolds with the same average porosity and different porosity change rate are designed by adjusting central porosity P_in, marginal porosity P_out and gradient change rate n. The mechanical properties of radially graded porous scaffolds and homogeneous porous scaffolds are studied by finite element method (FEM) analysis and mechanical experiment, and their differences are compared. The results of FEM analysis show that the mechanical properties of the radially graded porous scaffolds are better than those of the homogeneous porous scaffolds with the same average porosity. The higher the average porosity is, the better the mechanical properties of radially graded porous scaffolds are. The results of mechanical experiments show that when the average porosity is 70%, the elastic modulus and compressive strength of radially graded porous scaffolds are (2.34±0.05)GPa and (67.63±1.33)MPa, respectively. The elastic modulus and compressive strength of radially graded porous scaffolds are (3.96±0.19)GPa and (90.83±3.35)MPa, respectively. The FEM analysis and mechanical experiment show that the radially graded porous scaffolds have better performances than the homogeneous porous scaffolds.

Key words: triply periodic minimal surfaces, radially graded porous scaffold, finite element method, mechanical properties

中图分类号:

R318

高芮宁, 李祥. 径向梯度多孔支架设计与力学性能分析[J]. 机械工程学报, 2021, 57(3): 220-226.

GAO Ruining, LI Xiang. Design and Mechanical Properties Analysis of Radially Graded Porous Scaffolds[J]. Journal of Mechanical Engineering, 2021, 57(3): 220-226.

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径向梯度多孔支架设计与力学性能分析

Design and Mechanical Properties Analysis of Radially Graded Porous Scaffolds

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