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Roll No__________________ 

KUMARAGURU COLLEGE OF TECHNOLOGOY, COIMBATORE – 641 049

Departe!t "# Aer"!a$t%&a'

INTERNAL TEST - II

(ee)ter *+

Degree & Branch: BE - Aer"!a$t%&a' E!.%!eer%!. Date : /**/01Sub Code & Name AER11 - C"p")%te Mater%a') - (tr$&t$re) Time: FNDuration: Two hrs Maximum Marks: !

2ART A

  3A!)er A'' t5e $e)t%"!)7 310 8 1 10 Mar:)7

"# The $ro$erties o% the com$osite are determined b'a( The geometr and orientation o% the %ibres

in the com$osite

'b( The ratio o% %ibre to resin in the com$osite

')ibre *olume )raction('c( The $ro$erties o% the %ibre+resin 3;7 A'' t5e a<"=e

,# )or better im$act resistance the most suitable material is'a( Carbon + -$ox 3<7 Ke='ar > Ep"8?'c(  -./lass + -$ox 'd( None o% these

0#The %unction o% resin is to

'a( se$arate 'b( attract

3&7 <%!; 'd( collect

1# The resin %re2uentl used at room tem$erature is

'a( carbon 'b( %ibre

'c( glass 3;7 ep"8?

# The densit o% glass %ibres is3a7 M"re t5a! t5at "# &ar<"! #%<re) 'b( less than that o% carbon %ibres'c( -2ual to carbon %ibres 'd(  None o% the abo3e

4# 5ramid %iber is also called as'a( /lass %iber 'b( Carbon %iber3&7 Ke='ar #%<er 'd(  None o% these

6# Mass Densit o% a 7l com$osite is denoted b 89 ;

3a7 @# # @ 'b( 9% *% . 9m*m

'c( 9% <*% < 9m<*m 'd( '9% *% ( + '9m*m(

=#  ______ material is brittle> hard> strong in com$ression> weak in shearing and tension#

3a7 Cera%& 'b( 7lastic

'c( metal 'd( com$osite

?#  __________ is an indication o% a com$osite material@s abilit to resist de%ects or discontinuities

such as holes and notches#

3a7 Fra&t$re T"$.5!e)) 'b( Tensile strength

'c( Am$act strength 'd( Delamination

"!# )lexibilit is de%ined as the in3erse o% ......... sti%%ness

'a( Moment 'b( shear  3&7 <e!;%!. 'd( axial

2ART B 38/ 10 Mar:)7

11.

Distinguish between natural axis and arbitrary axis?

1 Distinguish between open mould and close mould processes

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2.13.

How local and global stresses are related?

14.

Explain flament winding?

15.

What is meant by elasticity approach?

2ART C 3810 0 Mar:)7

3A!)er a!? T5ree $e)t%"!)7

16.

Brie%l ex$lain the o$en moulding $rocess#

17.

Deri3e the ex$ression %or stress strain relation with res$ect to natural axis

18.

Deri3e the ex$ression %or stress strain relation with res$ect to arbitrar axis

19.

)ind the %ollowing %or a 4! angle lamina o% gra$hite+e$ox# se the $ro$erties o%unidirectional gra$hite+e$ox lamina %rom -";"="/7aE -,;"!#0 /7aE v",;!#,=E

/",;6#"6/7aE

'i( Trans%ormed com$liance matrix

'ii( Trans%ormed reduced sti%%ness matrix20.

)ind the %ollowing %or a 4! angle lamina o% gra$hite+e$ox# se the $ro$erties o%unidirectional gra$hite+e$ox lamina %rom -";"="/7aE -,;"!#0 /7aE v",;!#,=E

/",;6#"6/7aEFx;,M7a> F;.0 M7a> Fx;1M7a

'i(/lobal strains

'ii(Gocal stresses'iii(local strain

'i3($rinci$al stresses