Page - 106 - in 3D Printing of Metals

Metals 2016,6, 280 platewas tested inanarmoredvehicle invariousconditions. Theresults showthat theredesigned componentscanmeet therequirementsofuseanddecrease thecostandweightofparts. The findings in this paper provide a foundation for lightweight part design. This research illustrates that partsmanufactured by the SLMprocesswith a small size aremore vulnerable to processdefects. This redesignmethodhasbeenapplied insomeautomobileparts suchas thestopper andconnectingplate. Thecostandmanufacture timeofSLMpartscanbecutdownwith thismethod. Thismethodisacomplement tocurrent lightweightdesignmethods. It canalsobewidelyused in the fieldsof theautomotive industry,aviation industry, spacecraftandsoon. Thisdesignmethodonly focusedonsomecommonparts suchas the stopperandconnecting plate. Thus, theuniversality of themethodwas limitedby the component types analyzedbefore. Themechanical properties of the lattice structure in the compression testsmight be poor due to the high aspect ratio of the rods. Further study should improve the universality of thismethod. Smaller-aspect-ratiosampleswillbefabricatedandtestedtoeliminate thisconfusioninfutureresearch. Acknowledgments:TheauthorswouldliketothankQingbiaoZhangforthepreparationof3Dprintedspecimens bytheSLMprocess. AuthorContributions: Li Tang andChunbingWuconceived anddesigned the experiments; ChunbingWu performedtheexperiments;LiTang,ChunbingWuandZhixiongZhanganalyzedthedata; JianzhongShangand ChaoYanwrote thepaper. Conflictsof Interest:Theauthorsdeclarenoconflictof interest. Nomenclature D1 locationdiameterofmountinghole D2 diameterof innerring L fracture length L0 initial length N numberofmountinghole P maximumload S sectionarea γ thicknessofdowelbar σ sectionstress ε elongationpercentage η thicknessof frame References 1. Kruth, J.P.;Froyen,L.;Vaerenbergh, J.V.;Mercelis,P.;Rombouts,M.;Lauwers,B.Selective lasermeltingof iron-basedpowder. J.Mater. Process. Technol. 2004,149, 616–622. [CrossRef] 2. Parthasarathy, J.; Starly,B.;Raman,S.;Christensen,A.Mechanicalevaluationofporous titanium(Ti6Al4V) structureswithelectronbeammelting (EBM). J.Mech. Behav. Biomed.Mater. 2010,3, 249–259. [CrossRef] [PubMed] 3. Harrysson,O.L.A.;Cansizoglu,O.;Marcellin-Little,D.J.;Cormier,D.R.;West,H.A.Directmetal fabricationof titaniumimplantswithtailoredmaterialsandmechanicalpropertiesusingelectronbeammeltingtechnology. Mater. Sci. Eng.C2008,28, 366–373. [CrossRef] 4. Evans, A.G.; Hutchinson, J.W.; Fleck, N.A.; Ashby, M.F.; Wadley, H.N.G. The topological design of multifunctionalcellularmetals.Prog.Mater. Sci. 2001,46, 309–327. [CrossRef] 5. Cansizoglu,O.;Harrysson,O.;Cormier,D.;West,H.;Mahale,T.PropertiesofTi–6Al–4Vnon-stochastic latticestructures fabricatedviaelectronbeammelting.Mater. Sci. Eng.A2008,492, 468–474. [CrossRef] 6. Campanelli, S.L.;Contuzzi,N.;Ludovico,A.D.;Caiazzo,F.;Cardaropoli,F.; Sergi,V.Manufacturingand CharacterizationofTi6Al4VLatticeComponentsManufacturedbySelectiveLaserMelting.Materials2014,7, 4803–4822. [CrossRef] 106