Mechanical Performance of Porous Implant With Different Unit Cells

Abstract

This study investigates the effect of different unit cells on the mechanical performance of porous implant. Three shapes of unit cells (Diamond 30(DO30), Octet truss 30(OT30), and Rhombic dodecahedron 30(RD30)) were selected, which have the same relative density. Corresponding models of single pore (SP), repeating pores (RP) and porous implant (PI) were created. Using finite element methodology, mechanical performances of three classes of models under the conditions of pressure and torsion were simulated based on the same static load (SP: 50[Formula: see text]N, 0.125[Formula: see text]N[Formula: see text]m; RP: 200[Formula: see text]N, 0.5[Formula: see text]N[Formula: see text]m; PI: 200[Formula: see text]N, 0.5[Formula: see text]N[Formula: see text]m), respectively. Results demonstrated that RP showed consistent mechanical performances with SP: OT30 displayed the lowest stresses, displacements, and strains under the conditions of pressure and torsion, and conversely DO30 always resulted in the highest magnitudes. For the case of PI, mechanical performances were different from SP and RP: implant with shape of RD30 resulted in the lowest stress (275.2[Formula: see text]MPa) under the condition of pressure, but displacement (2.236e[Formula: see text]002[Formula: see text]mm) and strain (3.050e[Formula: see text]003) of OT30 were the largest; under the condition of torsion, stress sequence was same as SP and RP, but DO30 provided the highest strain (2.437e[Formula: see text]003), RD30 displayed the largest displacement (1.508e[Formula: see text]002[Formula: see text]mm). Unit cell influences mechanical performance of porous implant directly, and the implant outline and incomplete structure may also affect it. It could not select pore simply by the right type of unit cell, and surface area is an important parameter as well as pore size.

Topological, Mechanical and Biological Properties of Ti6Al4V Scaffolds for Bone Tissue Regeneration Fabricated with Reused Powders via Electron Beam Melting

“…The most important geometrical features in DO and RD geometries such as pore size, strut size and porosity were investigated by Li et al [ 46 ] using software analysis. All these parameters not only affect biological performance but also play a central role in mechanical properties [ 5 ].…”

“…Li et al [ 5 , 46 ] investigated scaffold produced from virgin new powder with the same unit cell geometries (DO and RD) of our scaffolds that were produced with the blended P1 powder described above. Therefore, results obtained by Li et al from software simulation [ 46 ] and mechanical tests [ 5 ] were taken here as reference and compared with our results in Table 7 .…”

Evaluation and Prediction of Mass Transport Properties for Porous Implant with Different Unit Cells: A Numerical Study

“…Specifically, volume and surface area were analyzed automatically in the SolidWorks software, and max-pore size could be measured manually. Further on, porosity and surface-to volume ratio were calculated as [23, 27]T17p=V0−VV0×100%s=VS∗where V 0 and V are the volumes of the solid initial structure and porous structure, respectively, and S ∗ is the surface area of porous structure.…”