选区激光熔化梯度多孔支架力学性能和能量吸收研究

基于三周期极小曲面设计梯度Ti6Al4V多孔支架，并采用选区激光熔化打印成形，分析边缘孔隙率Pout、中心孔隙率Pin和平均孔隙率P-对力学性能和能量吸收的影响。研究结果表明：相同P-的梯度多孔支架弹性模量、抗压强度和单位体积的总吸收能量WV都随着Pout的增大而减小，随着Pin的增大而增大；不同P-的梯度多孔支架弹性模量、抗压强度和WV随着P-的增大而减小；P-对其弹性模量、抗压强度和WV的影响大于Pin、Pout的影响。打印成形的梯度多孔支架能够满足股骨和胫骨的弹性模量、抗压强度要求，建立的力学性能模型可为面向骨科医学多孔支架的应用提供参考。

Study on Mechanics Properties and Energy Absorption of Gradient Porous Scaffolds Fabricated by SLM

Gradient Ti6Al4V porous scaffolds were designed based on triply periodic minimal surfaces（TPMS） and were fabricated by SLM technology. The effects of edge porosity Pout， center porosity Pin and average porosity P- on mechanics properties and energy absorption were analyzed. The results show that elastic modulus， compressive strength and total absorbed energy per unit volume WV of gradient porous scaffolds with the same P- all decrease with the increase of Pout and increase with the increase of Pin. The elastic modulus， compressive strength and WV of gradient porous scaffolds with the different P- all decrease with the increase of P-. P- has greater influence on elastic modulus， compressive strength and WV than Pin and Pout. The printed gradient porous scaffolds meet the requirements of elastic modulus and compressive strength of femur and tibia. The mechanics property model established may provide a reference for the applications of porous scaffolds in orthopedics.