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Zhu, Man
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article
Effect of intra-ply voids on the homogenized behavior of a ply in multidirectional laminates
Abstract
Thisworkfocusesontheeffectofintra-plyvoidsonthehomogenizednonlinearbehaviorofaplyinmultidirectionalcomposites.Voidsweremodeledexplicitlyonthefiberscale and linked to the ply-scale by the recently developed two-scale framework which couplesClassical Laminate Theory on the macro-scale with Finite Element analysis on the micro-scale. Laminates[±45]2sand[±67.5]2swereusedasvalidationcases.Thecomputedhomogenizedbehaviorofplieswithandwithoutvoidsforeachlaminatewerecomparedagainstexistingexperimentaldataonmanufacturedplates.Thenonlinearityofthehomogenizedstress-strain curves of all models is in a good agreement with experiments up to 1% of applied deformationfor a laminate [±45]2s and up to 0.4% for a laminate [±67.5]2s.The effect of voids was assessed onlyvirtuallyanditisshownthat4%ofvoidcontentdecreasestheplystrengthby30%,transversal Young’s and shear moduli by around 10% and 8% respectively, whereas longitudinal stiffnessisonlyslightlyaffectedbythepresenceofvoids.Thisworkisthefirststeptowardsautomatization of the virtual identification of the complete set of damage-plasticity parameters for the LMT-Cachan damage model accounting for the presence of intra-ply voids.