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Materials Crib Sheet 2 (Ch 6, 18, 19) (2)

Course: MATERIALS 1M03, Spring 2011
School: McMaster
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Word Count: 538

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Stress: = F Chapter6MechanicalPropertiesofMetals Typesofstresses:Tensile,Compressive,Shear,BiaxialTensionCompression,Hydrostatic. A0 ,Strain: = l l0 Shearstress: = F ,Shearstrain: = l = tan A0 l0 = E Stressandstrainareproportionaltoeachotherusing W= F (EYoungsModulus)or = G (GShearModulus).Physicsofelasticity: E= :: r E = 2 G 1+ 2U ,Energystored: r 2 2V0 1 ,Poissonsratio: V0 = 2 2E = x z...

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Stress: = F Chapter6MechanicalPropertiesofMetals Typesofstresses:Tensile,Compressive,Shear,BiaxialTensionCompression,Hydrostatic. A0 ,Strain: = l l0 Shearstress: = F ,Shearstrain: = l = tan A0 l0 = E Stressandstrainareproportionaltoeachotherusing W= F (EYoungsModulus)or = G (GShearModulus).Physicsofelasticity: E= :: r E = 2 G 1+ 2U ,Energystored: r 2 2V0 1 ,Poissonsratio: V0 = 2 2E = x z (bottomofratiostrainindirectionofappliedforce) ( ) . Deformation:Metallicmaterialsdeformelastically(reversible)untilstrainsofabout.005.Afterthat,plastic(irreversible)deformationoccurs.*Note:Elasticdoesntconservevolume, plasticdoes.* Workhardening:Aftertheyyield,metalsgethardertodeform.TensileStrength=Fmax/A0 Ductility:%elongation=](lfl0)/l0]*100,%areareduction=[(A0Af)/A0]*100 Hardnesstests: H : Pindent (pressurevs.area) Chapter18ElectricalPropertiesofSolids Aindent Brinell: HB = D D D 2 d 2 ( 2P ) (Pload,Ddiameterofsteelball:10mm,dindentdiameter),Resilience: UR = 2 y 2E OhmsLaw: V = IR J = (electricalconductivity, or theareaperpendiculartothedirectionofthecurrent. p: e Eg kT = / 1 , electricfieldintensity, = V / l ),Resistivity: RA = /l ,wherelisthedistancewherevoltageismeasured,Ais (pprobability,#ofelectronsexcited(holescreated)),ifEg>2eV,thenp0insulator.Forsemiconductors,asT,Ne . e Metals:ElectronDriftVelocity T n,but dominant(morecollisionsimpede =ne v = e d Conductivity: (n#freee s,echargeofe electronmobility) movement).Resistivity(MatthiessensRule): = TR thermal + impurity + dislocations . E g 2 kT Extrinsic(doped):ntype: Semiconductors:Intrinsic(pure): (n=p),Temp.dependence: (excesse,n>>p,n=#ofvalencee#dopantatoms, = n e (e + h ) n = n0 e n e e E g kT Eg 2 kT addgroupVP);ptype: (excessholes,p>>n,p=#ofholesinvalence#dopantatoms,addgroupIIIAltogroupIVSi).Temp.dep.: p e h n = n0 e =e e e . . Chapter19ThermalPropertiesofSolids Forsemiconductors,T .Forwardbias: Reversebias: Q V Capacitancechargedensity: A = h / + h / Typicalconductivityrangesmetals: 11 2 2 107,semiconductors:104.Orbitals:sshell:Nstates;pshell:3Nstates;dshell:5Nstates(2e/state) dQ ,forT< D,C=AT3;forT> D,C=3R( DDebyetemperature,Rgasconstant) HeatCapacity: C= dt Thermalflux: dT q = k dx ThermalStress:inducedbyconstraints,diff.matls.bonded,Tgradients: Coolingrate: k f E Constants&Conversions giga mega kilo centi 23 G M k c 109 10 10 6 milli micro nano pico 5 m n p 103 106 109 1012 = thermal = E T E thermal L = = T room T Lroom ( ) , 103 2 , Q R = k T = TSR . L = k elecT k=1.3810 J/atom K=8.6210 eV/atom K R=8.314J/mol KNA=6.0231023atoms/mol e=1.6021019Cme=9.111031kg Shit,piss,fuck,cunt,cocksucker,motherfucker,tits,fart,turdandtwat.Shit,piss,fuck,cunt,cocksucker,motherfucker,tits,fart,turdandtwat. Shit,piss,fuck,cunt,cocksucker,motherfucker,tits,fart,turdandtwat.Shit,piss,fuck,cunt,cocksucker,motherfucker,tits,fart,turdandtwat. Ifuckedyourmom,Iwannasuckmydad,andmymommytoo,ohisthisthingon?
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