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1、PolymerTesting28(2009)463–469ContentslistsavailableatScienceDirectPolymerTestingjournalhomepage:www.elsevier.com/locate/polytestMaterialPropertiesEffectofnatureandtypeofflawonthepropertiesofanaturalrubbercompounda,b,*baacd,*F.E.Ngolemasango,G.E.Nkeng,C.O
2、’Connor,J.Manley,M.Bennett,J.ClarkeaSmithersRapra,Shawbury,ShropshireSY44NR,UKbDepartmentofChemistry,FacultyofScience,UniversityofBuea,P.O.Box63,Buea,CamerooncARTIS,Unit5,BrookLaneIndustrialEstate,Westbury,WiltshireBA134EP,UKdDepartmentofMaterials,Lough
3、boroughUniversity,Loughborough,LeicestershireLE113TU,UnitedKingdomarticleinfoabstractArticlehistory:Fractureinrubber,likeinallothermaterials,isinitiatedatimperfectionsinadvertentlyReceived29December2008presentorintroducedinthebodyofthematerialoronthesur
4、faceduringprocessing.TheAccepted11February2009pointofinitiationoffractureintherubberisusuallyatflawswhicharemacroscopicormicroscopicimperfectionsorinhomogeneitiesintherubber.InordertoinvestigatetheKeywords:effectoftheseflawsonthepropertiesofanaturalrubber
5、compound,cutstomimicweldNaturalrubberlineswereintroducedbeforeandnearscorchatvariouscuretemperatures,andthetimeWeldlinesforacompletehealingofthesecutsdetermined.Thetensilepropertieswerenotsignifi-Scorchcantlyaffectedbytheintroductionofweldlinesbeforescor
6、chprovidedsufficienttimewasPinholeflawIntrinsicflawsizeallowedforhealing.Healingtimereducedwithincreaseincuretemperature.Theintrinsicflawsizesinamaterialinherentlyaffectthematerialtensilepropertiesanddependsignificantlyonthesizeoftheflaw.Pinholeflawsofvaryings
7、izesintroducedaftercurehadasignificanteffectonbothtensilestrengthandfatiguelifewiththepinholeequivalentintrinsicflawsizeestimatedtobeabout200mm.CrownCopyrightÓ2009PublishedbyElsevierLtd.Allrightsreserved.1.Introductioninitiationofafractureinrubberisusuall
8、yatflaws,whicharemacroscopicormicroscopicimperfectionsorinhomo-Themanufactureandconstructionofengineeringgeneitiesintherubber.Flawssuchasvoidsornotchescomponentsandstructuresnecessarilyinvolvestheintro-couldbeintroducedduringmould
