Introduction Thermoplasticcompositesconsistoffiberswithhighstrengthandmodulus,suchascarbonfibers,fiberglass,andnylon,imbeddedinorbondedtoaplasticmatrixThermoplasticcompositesconsistoffiberswithhighstrengthandmodulus,suchascarbonfibers,fiberglass,andnylon,imbeddedinorbondedtoaplasticmatrixwithdistinctinterfacesbetweenthem.Inthisform,bothfibersandplasticmatrixretaintheirphysicalandchemicalidentities.However,theyproduceacombinationofpropertiesthateitherofthemcanachievealone.Generally,fibersaretheprincipalloadcarryingmembers,whilethesurroundingplasticskeeptheminthedesiredlocationandorientation,actingasaloadtransfermediumandprotectingfibersfromenvironmentaldamages,suchastemperaturesandhumidity.Manyfiberreinforcedpolymersofferacombinationofstrengthandmodulusthatarecomparableorevenbetterthanmanytraditionalmetals.Duetotheirlowdensity,thestrengthweightratiosandmodulusweightratiosofthesecompositesareremarkablysuperiortothosemetals.Inaddition,fatiguestrengtharealsoexcellent.Forthesereasons,fiberreinforcedpolymershavebeenwidelyusedinmanyweightcriticalcomponentsinaerospace,automotiveandothercommercialorindustrialfields.Becauseoftheformationofthesecomposites,theyexhibithighlyanisotropicordirectiondependentmechanicalproperties,comparedtomostmetallicmaterials.Therefore,puttingthemtoactualuserequiresverycarefuldesignpracticeandpropermanufacturingprocessdevelopmentbasedontheunderstandingtheiruniquemechanical,physicalandthermalcharacteristics.Itisbecauseofthecharacteristicofthesepolymercompositesandthedifficultyofhandlingthematerialsandcontrollingthestrengthindesireddirectionsbylayingcontinuousfibersthatmanufacturingafiberreinforcedcompositestructureistimeconsuming.Generallytheproductionrateisverylowcomparedtoconventionalmanufacturingmethods.Whatismore,buildingfiberreinforcedpolymerstructurewithcomplexfreeformgeometrytomeetthebroaderneedsandusagehasbecomeanotheroneofthebiggestchallenges.