激光粉末床熔融成形多孔结构的压缩性能及数值模拟研究

Compressive Properties and Numerical Simulation of Porous Structure Fabricated by Laser Powder Bed Fusion

人体骨骼为层级结构,由密度、强度较高的密质骨和密度较低、内含血管的松质骨组成。因此,人体植入物的结构和力学性能要与人体骨骼特征相匹配。基于人体自然骨的受力情况,采用激光粉末床熔融(LPBF)技术成形了由拓扑优化方法设计的钛合金多孔结构,然后通过压缩实验和数值模拟的方法对多孔结构的力学性能和变形失效模式进行了分析,发现数值模拟与实验结果具有较高的一致性。最后,通过与人体自然骨的力学性能对比,并结合多孔结构的失效模式获得了可适用于人体植入物的多孔材料。

The human bone appears as a hierarchical structure composed of cortical bone with high density and strength and cancellous bone with low density and blood vessels.Therefore,the structure and mechanical properties of human implants should match the characteristics of human bone.Based on the stress on the natural human bone,the titanium alloy porous structure designed by topology optimization method was fabricated by laser powder bed fusion(LBPF).The mechanical properties and deformation failure mode of the porous structure were analyzed by compression experiment and numerical simulation.It was found that the numerical simulation and experimental results have a high consistency in the current work.Finally,by comparing with the mechanical properties of human natural bone,combined with the failure mode of porous structure,a porous material suitable for human implants was obtained.