| Autor: |
Bregoli C; National Research Council, CNR-ICMATE, Via Gaetano Previati, 23900 Lecco, Italy.; Mechanical Engineering Department, Politecnico di Milano, Via La Masa 1, 20156 Milano, Italy., Mohajerani S; Mechanical Industrial and Manufacturing Engineering Department, The University of Toledo, 2801 West Bancroft St., Toledo, OH 43606, USA., Fiocchi J; National Research Council, CNR-ICMATE, Via Gaetano Previati, 23900 Lecco, Italy., Mehrpouya M; Faculty of Engineering Technology, University of Twente, Drienerlolaan 5, 7522 Enschede, The Netherlands., Elahinia M; Mechanical Industrial and Manufacturing Engineering Department, The University of Toledo, 2801 West Bancroft St., Toledo, OH 43606, USA., Tuissi A; National Research Council, CNR-ICMATE, Via Gaetano Previati, 23900 Lecco, Italy., Vergani LM; Mechanical Engineering Department, Politecnico di Milano, Via La Masa 1, 20156 Milano, Italy., Biffi CA; National Research Council, CNR-ICMATE, Via Gaetano Previati, 23900 Lecco, Italy. |
| Abstrakt: |
Additively manufactured medical devices require proper surface finishing before their use to remove partially adhered particles and provide adequate surface roughness. The literature widely investigates regular lattice structures-mainly scaffolds with small pores to enhance osseointegration; however, only a few studies have addressed the impact of surface finishing on the dimensional deviation and the global and local mechanical responses of lattice samples. Therefore, the current research investigates the impact of biomedical surface finishing (i.e., corundum sandblasting and zirconia sandblasting) on Voronoi lattice structures produced by laser powder bed fusion (LPBF) with large pores and different thicknesses on the surface morphology and global and local mechanical behaviors. MicroCT and SEM are performed for the assessment of dimensional mismatch and surface evaluation. The mechanical properties are investigated with 2D digital image correlation (DIC) in quasi-static compression tests to estimate the impact of surface finishes on local maps of strain. In the quasi-static tests, both the global mechanical performances, as expected, and local 2D DIC strain maps were mainly affected by the strut thickness, and the impact of different surface finishings was irrelevant; on the contrary, different surface finishing processes led to differences in the dimensional deviation depending on the strut thickness. These results are relevant for designing lattice structures with thin struts that are integrated into medical prostheses that undergo AM. |
