Influence of the Fill Value Parameters on Acoustic and Physical–Mechanical Performance of 3D-Printed Panels

Abstract

Thisstudyinvestigatestheacousticandmechanicalperformanceofthreetypesof3D-printedpolylacticacid(PLA)panelswithvaryinginȀlldensities(5–100%)andstructuralconȀgurations.UsingfusedȀlamentfabrication(FFF),panelsweredesignedasfollows:Type1(coreinȀllonly),Type2(coreinȀll+1.6mmshell),andType3(coreinȀll+multi-layershells).AcoustictestingviaimpedancetuberevealedthatType2panelswitha65%inȀlldensityachievedthehighestsoundabsorptioncoefȀcient(α=0.99),whileType1panelsexhibitedsuperiorsoundtransmissionloss(TLn=53.3dBat60%inȀll).Mechanicaltestingdemonstratedthatshelllayersimprovedtensileandbendingresistanceby25.7%and36.9%,respectively,butreducedcompressivestrengthby23.6%.MicroscopicanalysishighlightedductilefailureinType2andbrittlefractureinType3.TheoptimalpanelthicknessforacousticperformancewasidentiȀedas4mm,balancingmaterialefȀciencyandsoundabsorption.TheseȀndingsunderscorethepotentialoftailoredinȀllparametersinsustainablenoise-controlapplications.