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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... Inc. 8DislocationStrengtheningMechanisms 8.1Introduction 8.2DislocationInteractionswithObstacles 8.3SolidSolutionStrengthening 8.4DislocationStrengthening 8.5GrainBoundaryStrengthening 8.6PrecipitationStrengthening 8.7DispersionStrengthening 8.8OverallSuperposition 8.9Summary Bibliography 9IntroductiontoComposites 9.1Introduction 9.2TypesofCompositeMaterials 9.3Rule -of- MixtureTheory 9.4Defo...

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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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... plastic deformation of solids are often controlled by the movem ent of defects. It is, therefore, important for the student of mechanical behavior to be familiar with the different types of defects that ... Hardness The hardness of a material is a measure of its resistance to penetration by an indenter. Hardness is also a measure of strength and often has the units of stress...

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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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