SLM成形多孔结构TC4骨科植入物的仿真与力学试验

Model Simulation and Mechanical Experiment of TC4 Orthopedic Implant with Porous Structure by SLM

采用Rhino软件设计了两种多孔结构TC4骨科植入物模型,结合有限元分析方法对TC4多孔结构模型进行静力学仿真,得到了两种多孔结构及其不同孔隙率下的应力分布和等效弹性模量。通过激光选区熔化(SLM)打印出两种多孔结构TC4骨科植入物,进行准静态压缩试验和纳米压痕试验,探究了两种多孔结构及其不同孔隙率下力学性能的差异性。仿真结果表明,两种多孔结构孔隙率越大,平均应力越小。相同孔隙率下,规则多孔结构的平均应力、等效弹性模量和渗透率均大于不规则多孔结构;规则多孔结构弹性模量为4.18~9.71 GPa,不规则多孔结构的弹性模量为2.69~5.84 GPa,均满足人骨弹性模量范围。相同孔隙率下,规则多孔结构的抗压强度、弹性模量和耐磨性能均优于不规则多孔结构,与仿真结果一致。

Rhino software was utilized to design porous TC4 orthopedic implant models,and statics simulation was conducted combined with finite element analysis to obtain porous structures as well as stress distribution and equivalent elastic modulus under different porosities.Porous TC4 orthopedic implants were printed by laser selective melting(SLM),and quasi-static compression experiments and nanoindentation experiments were carried out to investigate the heterogeneity in mechanical properties of porous structures with different porosities.The simulation results reveal that with increasing in the porosities of porous structures,the average stress is decreased.With the same porosity,the aver⁃age stress,equivalent elastic modulus and permeability of regular porous structures are greater than those of irregular ones.The elastic modulus of regular porous structure is between 4.18~9.71 GPa,and that of irregular porous structure is between 2.69~5.84 GPa,meeting the elastic modulus range of human bone.The compressive strength,elastic modulus and wear resistance of the regular porous structures are greater than those of irregular ones,which is in consis⁃tent with the simulation results.