DOI: 10.4018/IJMMME.2019040102 International Journal of Manufacturing, Materials, and Mechanical Engineering Volume 9 • Issue 2 • April-June 2019  Copyright©2019,IGIGlobal.CopyingordistributinginprintorelectronicformswithoutwrittenpermissionofIGIGlobalisprohibited.  33 Young’s Modulus and Poisson’s Ratio Estimation Based on PSO Constriction Factor Method Parameters Evaluation George Lucas Dias, Federal University of Lavras, Lavras, Brazil Ricardo Rodrigues Magalhães, Federal University of Lavras, Lavras, Brazil Danton Diego Ferreira, Federal University of Lavras, Lavras, Brazil Bruno Henrique Groenner Barbosa, Federal University of Lavras, Lavras, Brazil ABSTRACT Theknowledgeofmaterials’mechanicalpropertiesindesignduringproductdevelopmentphasesis necessarytoidentifycomponentsandassemblyproblems.Theseareproblemssuchasmechanical stressesanddeformationswhichnormallycauseplasticdeformation,earlyfatigueorevenfracture. Thisarticleisaimedtouseparticleswarmoptimization(PSO)andfiniteelementinverseanalysis todetermineYoung’sModulusandPoisson’sratiofromacantileverbeam,manufacturedinASTM A36steel,subjectedtoaloadof19.6Nappliedtoitsfreeend.Thecantileverbeamwasmodeled andsimulatedusingacommercialFEAsoftware.ConstrictionFactorMethod(PSOvariation)was usedanditsparameterswereanalyzedinordertoimproveerrors.PSOresultsindicatedYoung’s ModulusandPoisson’sratioerrorsofaround1.9%and0.4%,respectively,whencomparedtothe originalmaterialproperties.Improvementinthedataconvergenceandareductioninthenumberof PSOiterationswasobserved.ThisshowsthepotentialityofusingPSOalongwithFiniteElement InverseAnalysisformechanicalpropertiesevaluation. KEYwORdS Constriction Factor Method, Finite Element Method, Mechanical Properties Estimation, Optimization Methods, Performance Optimization, Robotic Manipulators INTROdUCTION Mostofmaterialsinservicearesubjectedtoloads.Inthiscontext,itisnecessarytoknowthematerial’s mechanicalpropertiestoavoidexcessivedeformations,earlyfatigueorevenfracture.Mechanical behaviorofmaterialsdependsonitsresponsetotheloadinwhichthematerialissubjected.Some ofthemainpropertiesthatassociateelasticdeformationwithstressaretheYoung’smodulus,shear modulus,thermalexpansioncoefficient,andPoisson’sratio(Callister,2007). Strainandstressdistributionsinmaterialssubjectedtoloadscanbeobtainedthrough experimentaltechniquesornumericalanalysiswhichdependonspecificmaterialproperties,