径向梯度多孔支架设计与力学性能分析

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.