TY - JOUR

T1 - Supportless lattice structure of 316L stainless steel fabricated by material extrusion additive manufacturing

T2 - Effect of relative density on physical, microstructural and mechanical behaviour

AU - Parsompech, Natthaphat

AU - Suwanpreecha, Chanun

AU - Noraphaiphipaksa, Nitikorn

AU - Hararak, Bongkot

AU - Songkuea, Sukrit

AU - Schuschnigg, Stephan

AU - Kukla, Christian

AU - Kanchanomai, Chaosuan

AU - Manonukul, Anchalee

N1 - Publisher Copyright: © 2024 Elsevier B.V.

PY - 2024/9/14

Y1 - 2024/9/14

N2 - Studies on lattice structures fabricated by material extrusion additive manufacturing for metal, leveraging the advantages of additive manufacturing, are limited. In this work, by varying the number of unit cells, the effects of density on the macro- and microstructure, and on the physical and mechanical properties of 316L stainless steel fabricated by our in-house developed 316L metal-filled filament were investigated. Utilising our in-house developed 316L metal-filled filament, supportless octet-truss lattice specimens with relative density ranging from 16 % to 55 % were successfully fabricated. The relative density increased with the number of unit cells, compressive strength, Young's modulus, and energy absorption, consistent with the Gibson-Ashby's porous material model. Stretch-dominated behaviour was observed in the 2 × 2 × 2 and 3 × 3 × 3 unit cells, while the 4 × 4 × 4 and 5 × 5 × 5 units exhibited bending-dominated behaviour. The deformation behaviour was well simulated by finite element analysis with the core-shell structure. The successful fabrication of supportless lattice structures highlights their potential for manufacturing lightweight materials and their future application.

AB - Studies on lattice structures fabricated by material extrusion additive manufacturing for metal, leveraging the advantages of additive manufacturing, are limited. In this work, by varying the number of unit cells, the effects of density on the macro- and microstructure, and on the physical and mechanical properties of 316L stainless steel fabricated by our in-house developed 316L metal-filled filament were investigated. Utilising our in-house developed 316L metal-filled filament, supportless octet-truss lattice specimens with relative density ranging from 16 % to 55 % were successfully fabricated. The relative density increased with the number of unit cells, compressive strength, Young's modulus, and energy absorption, consistent with the Gibson-Ashby's porous material model. Stretch-dominated behaviour was observed in the 2 × 2 × 2 and 3 × 3 × 3 unit cells, while the 4 × 4 × 4 and 5 × 5 × 5 units exhibited bending-dominated behaviour. The deformation behaviour was well simulated by finite element analysis with the core-shell structure. The successful fabrication of supportless lattice structures highlights their potential for manufacturing lightweight materials and their future application.

KW - 316L stainless steel: octet-truss structure

KW - Compressive property

KW - Finite element analysis

KW - Material extrusion additive manufacturing

UR - http://www.scopus.com/inward/record.url?scp=85204070455&partnerID=8YFLogxK

U2 - 10.1016/j.msea.2024.147270

DO - 10.1016/j.msea.2024.147270

M3 - Article

AN - SCOPUS:85204070455

VL - 915.2024

JO - Materials Science and Engineering: A

JF - Materials Science and Engineering: A

SN - 0921-5093

IS - November

M1 - 147270

ER -