復(fù)合材料復(fù)習(xí)題庫

1、復(fù)合材料復(fù)習(xí)題庫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（對模成型）(A)true(B)false6.IthasbeenestimatedthatoverthreequartersofallmatricesofPMCsarethermosetsofthesethemajityispolyester.(A)true(B)false7.AlthoughmanybenefitsaccruefromreinfcingPEEK（聚醚醚銅）unftunatelythecreeppro