INVESTIGATION OF THE LOAD-BEARING CAPACITY OF Co-Cr LATTICE STRUCTURES FABRICATED BY SELECTIVE LASER MELTING

Abstract

Additively manufactured Co-Cr lattice structures are promising choices especially in medical applications. This study involves the designing and fabrication of a novel lattice structures with FCCZZ (face-centered cubic with exterior and interior vertical struts) unit cell topology. The manufacturability by selective laser melting (SLM) and the load-bearing capacity of this structure were examined by utilizing scanning electron microscope (SEM) observations and uniaxial compression tests. The samples with FCCZ (face-centered cubic with vertical struts) structures were also produced and analyzed for comparison. The designed lattice structures were successfully manufactured by SLM even though an approximately 1.5-2% increase in the theoretical relative density values was observed. The novel FCCZZ samples exhibited superior performance in terms of the load-bearing capacity compared to FCCZ samples by possessing 17% higher specific strength value.

Compressive properties of AlSi10Mg lattice structures with novel BCCZZ and FCCZZ configurations fabricated by selective laser melting

“…In this study, the AlSi10Mg alloy exhibited a specific strength of 0.0447 MPa/(kg/m 3 ) for FCCZ-0.5, whereas the Co–Cr alloy with the same topology and strut diameter showed a specific strength of 0.0306 MPa/(kg/m 3 ) (Babacan and Seremet, 2022). Similarly, for FCCZZ-0.5 in the AlSi10Mg alloy, a specific strength of 0.0526 MPa/(kg/m 3 ) was achieved compared with 0.0361 MPa/(kg/m 3 ) in the Co–Cr alloy (Babacan and Seremet, 2022). The fact that the AlSi10Mg alloy is lighter than the Co–Cr alloy indicates its advantage in terms of specific strength.…”

“…Hereby, the use of additional vertical struts or the increase in the diameter of these elements can be an excellent option to provide a significant increase in mechanical strength, all while minimizing any substantial increase in weight. As a promising preliminary study, the current authors (Babacan and Seremet, 2022) explored the mechanical performance of a Co–Cr lattice structure produced by SLM by adding extra vertical struts to the FCC with vertical struts (FCCZ) structure. The resulting load-bearing capacity of the lattice structure was then compared with reference FCCZ specimens, revealing a 17% improvement in specific strength.…”

“…In recent years, studies focusing on the mechanical properties of different lattice topologies of various materials have become very popular. In particular, the body-centered cubic (BCC) (Smith et al , 2013; Boniotti et al , 2017; Li et al , 2018, 2021; Zadpoor, 2019; Liu et al , 2020; Hacisalihoğlu et al , 2021; Jin et al , 2021a; Traxel et al , 2021) and the face-centered cubic (FCC) (Mantrala et al , 2015; Choy et al , 2017b; Leary et al , 2018; Li et al , 2018, 2021; Lei et al , 2019; Červinek et al , 2021; Huo et al , 2021; Jin et al , 2021b; Babacan and Seremet, 2022) lattice structures are among the most popular topologies analyzed by researchers. The behavior of these structures is characterized by bending-dominated, as evidenced by an initial elastic deformation stage and subsequent continuous deformation at nearly constant plateau stress (Maconachie et al , 2022).…”

Dynamic mechanical properties of selective laser-melted AlSi10Mg lattice structures: experimental and numerical analysis with emphasis on Johnson-Cook model parameters

“…The performance of lattice structures under both static and dynamic loads has undergone comprehensive investigation across numerous studies [10][11][12][13][14][15][16][17][18][19]. For instance, Platek et al [10] conducted an in-depth examination wherein they subjected 316L steel lattice structures to both quasi-static and dynamic compression tests.…”