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1、復(fù)合材料復(fù)習(xí)題庫(kù)9.Thetransversetensilestrengthofanalignedcontinuousfibrecomposite(A)isobtainedwhentestingnmalto(垂直于)thefibreaxis(B)isobtainedwhentestingparallelto(平行于)thefibreaxis(C)isthelowesttensilestength(D)isthehighesttensil

2、estrength(E)dependsmainlyonthepropertiesofthematrixofthefibrematrixinterface(G)dependsmainlyonthepropertiesofthefibres.Eachofthesentencesinquestions11to14consistsofanassertionfollowedbyareason.Answer:(A)ifbothassertionre

3、asonaretruestatementsthereasonisacrectexplanationoftheassertion(B)ifbothassertionreasonaretruestatementsbutthereasonisnotatrueexplanationoftheassertion(C)iftheassertionistruebutthereasonisafalsestatement(D)iftheassertion

4、isfalsebutthereasonisatruestatement(E)ifboththeassertionreasonarefalsestatements.11.ThecoefficientofthermalexpansionofanMMCwithaceramicreinfcementislessthanthatofthematrixbecausethecoefficientofthermalexpansionofaceramic

5、isusuallylessthanthatofametal.12.GenerallyreinfcingametaldegradesbothductilitytoughnessbecausethereisanincreaseinYoungsmodulus.13.Unftunatelyreinfcementofametalmarkedlyreducesthefatigueresistancebecausecracksarereadilyfm

6、edwithinthereinfcement.14.Thespecificstrengthmodulusofasiliconcarbideparticle(碳化硅粒子)reinfcedaluminiumalloyaresuperitothoseofthematrixbecausesiliconcarbideismedensethanthecommonaluminiumalloys.9.ACE11.A12.B13.E14.B9.Reinf

7、cingaluminawithSiCwhiskersABE(A)enhancesthethermalshockresistance(B)lowersthecoefficientofthermalexpansion(C)decreasesthethermalconductivity(D)increasesthedensity(E)improvesthetoughness..10.Theroomtemperaturetensilestres

8、sstraincurvesinFigure4.35arefLASSiCfibrecomposites.ThebreakdownoflinearityinthecurvesatthepointmarkedMisduetoC(A)plasticdefmationassociatedwithdislocationmotion(B)fractureofthefibres(C)matrixmicrocracking(D)viscousflowof

9、aglassyphase(E)fibrepullout.3.Polycarbonate(聚碳酸酯)isanacceptedgenerictermfsyntheticpolyaes(聚酰胺)(A)true(B)false4.Hlayup(手糊成型)requireslittlecapitalequipmentbutislabourintensive(A)true(B)false5.Figure5.24isadiagramofmatchedd

10、iemoulding(對(duì)模成型)(A)true(B)false6.IthasbeenestimatedthatoverthreequartersofallmatricesofPMCsarethermosetsofthesethemajityispolyester.(A)true(B)false7.AlthoughmanybenefitsaccruefromreinfcingPEEK(聚醚醚銅)unftunatelythecreeppro

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