Mechanical Properties of Engineered Materials 2008 Part 10 doc

... Inc. usarefamiliarwithpolymermatrixcompositesthatareoftenusedinmod- erntennisracquetsandpolevaults.Wealsoknow,fromwatchingathletic events,thattheseso-calledadvancedcompositematerialspromotesignifi- cantimprovementsinperformance. Thischapterintroducestheconceptsthatarerequiredforabasic understandingoftheeffectsofcompositereinforcementoncomposite strengthandmodulus.Followingabriefdescriptionofth...

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... logarithms of Eq. (5.9) gives log  ¼ log k þ n log " ð5 :10 Equation (5 .10) is the equation of a straight line, with a slope of n, and a y axis intercept of log K. Hence, from Eq. (5 .10) , the ... Inc. 5.2PHYSICALBASISFORPLASTICITY 5.2.1PlasticityinCeramics Mostceramicsonlyundergoonlyelasticdeformationpriortotheonsetof catastrophicfailureatroomtemperature.Hence,mostreportsont...

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... Inc. sourceisinitiated.Theaboveprocessmaycontinuebysubsequentcross-slip andFrank–Readsourcecreation,givingrisetoalargeincreaseinthedis- locationdensityondifferentslipplanes.Thehighdislocationdensity (10 15 10 18 m/m 3 )thatgenerallyresultsfromtheplasticdeformationof annealedcrystals(withinitialdislocationdensitiesof $10 8 10 10 m/m 3 ) may,therefore,beexplainedbythebreedingofdislocatio...

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... Inc. plex.Inanycase,foraprocesszoneofsize,h,cracklength,a,andwidth,W, theconditionforsmall-scaleyieldingisgivenbyArgonandShack(1975)to be CTOD c (h<a<Wð13:3Þ WhereCTOD c isthecriticalcracktipopeningdisplacementandtheother variableshavetheirusualmeaning.Forfiber-reinforcedcomposites,the CTOD c is$1À2mm(ThoulessandEvans,1988;Budianskyand Amazigo,1997),whileinthecaseoffiber-reinforcedcements...

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... treatment of the fundamen- tals of the mechanical behavior of materials. The text provides a rigorous review of the fundamental mechanics aspects of the mechanical behavior of materials. Shackleford, ... Inc. 1 Overview of Crystal/Defect Structure and Mechanical Properties and Behavior 1.1 INTRODUCTION The mechanical behavior of materials describes the response...

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... Inc. 3 BasicDefinitionsofStressandStrain 3.1INTRODUCTION Themechanicalpropertiesofmaterialsdescribetheircharacteristic responsestoappliedloadsanddisplacements.However,mosttextsrelate themechanicalpropertiesofmaterialstostressesandstrains.Itis,therefore, importantforthereadertobecomefamiliarwiththebasicdefinitionsof stressandstrainbeforeproceedingontotheremainingchaptersofthis book.However,thewe...

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... Inc. Cottrell, A.H. (1957) The Properties of Materials at High Rates of Strain. Institute of Mechanical Engineering, London, UK. Courtney, T.H. (1990) Mechanical Behavior of Materials, John Wiley, New ... Inc. givenbyEq.(6.5)foracubiclattice.Slipis,therefore,morelikelytooccur bytheexchangeofbonds,thanthecompleteshearofatomicplanesover eachother,assuggestedbyFig.6.1. Thereader...

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... Inc. isms,especiallywhenthenatureoftheparticleboundariespermitdisloca- tionentryintotheparticles,asshownschematicallyinFigs8.13(a)and 8.13(b)forcoherentandsemicoherentinterfaces(notethatcoherentinter- faceshavematchingprecipitateandmatrixatomsattheinterfaces,while semicoherentinterfaceshaveonlypartialmatchingofatoms).Incontrast, dislocationentry(intotheprecipitate)isdifficultwhentheinterfacesa...

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