Influence of thermal residual stress on behaviour of metal matrix composites reinforced with particles

摘要

Thepropertiesofametallicmatrixcompositesmaterials(MMC's)reinforcedwithparticlescanbeaffectedbydifferenteventsoccurringwithinthematerialinamanufacturingprocess.Theexistenceofresidualstressesresultingfromthemanufacturingprocessofthesematerials(MMC's)canmarkedlydifferentiatethecurvesobtainedintensiletestsobtainedfromcompressiontests.Oneofthethemesdevelopedinthisworkistheinfluenceofresidualstressesonthemechanicalbehaviourofthesematerials.TheobjectiveofthisresearchworkpresentedisnumericallyestimatethethermalresidualstressesusingaunitcellmodelfortheMgZC71alloyreinforcedwithSiCparticleswithvolumefractionof12%(hot-forgingtechnology).TheMMC'smicrostructureisrepresentedasathreedimensionalprismaticcube-shapedwithacylindricalreinforcingparticlelocatedinthecentreoftheprism.Thesecellmodelsarewidelyusedinpredictingstress/strainbehaviourofMMC'smaterials,inthisanalysistheuniaxialstress/strainresponseofthecompositecanbeobtainedthroughthecalculationusingthecommercialfinite-elementcode...