.l I lttrlrra NATIOI{ALT,, TYERI'ITY OF SINGA,FONE MEIII' - MICf,AI{IGI OT MATEnIAI.3tr (S.oEG 2; 4Y200{-2001 llaeAlowd: 2IIf,r INSTRUCTIONS r() CANDInAIT'q: !. Ttb qnLrkn pf cooi!3 F(xit (O qucdor aA cmpascs $x (O FLtt d FF' 2. Arrtrd It(tllR(O $tdd& !. A|l $rcab.art.{d d. a. TlbbrcumDdXcrff.
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
. l
I
lttrlrra
NATIOI{AL T,, TYERI'ITY OF SINGA,FONE
MEIII' - MICf,AI{IGI OT MATEnIAI.3 tr
(S.oEG 2; 4Y200{-2001
llaeAlowd: 2IIf,r
INSTRUCTIONS r() CANDInAIT'q:
!. Ttb qnLrkn pf cooi!3 F(xit (O qucdor aA cmpascs $x (O FLtt dF F '
2. Arrtrd It(tllR(O $tdd&
!. A|l $rcab.art.{d d.
a. TlbbrcumDdXcrff.
Pg,2 MElllta
Fo .h.
The follosil|g formulG writh ushg *rodad amios nry bG u!cd.
YlcH Critqtr:
(l) Trcsca Yicld Criuin
Sfrb ErcitL|:
Axid ladiDg:
BlldiE:
Tqsln:
(2) Vo Mi!.r CriEkr
'- =|t"* -"..)=?
- rg . . )
_,o_)
-'--)
u=tI1a.'ozEA
u=?!f-a62f;l
L12U= J-:-&(
62Gr
"-=|G--'-,",=iG,---" .= | (o - - ' - ,
l lfo=Et. , fr=dt, ,
G t E4l+v)
Corrfitrllvr rdrdor ftr Lotrolac &rdc lttttb:
Ir- =
6t-
ME2lla
Or6tior I
A strair glrgc fu mourt d oi s tiirFwal€d cylidricel pr.s$rc vcsscl oflhickr.ss 5 mm .tddirm.b 600 mm rs So*! in Figue l.Iflbc drrin gat3c hls t gauga Lttgth of 5 mm stdclqgrtcs 0,0(D mm wlrco o bEorl plwrc P is applic4 drtrmirc:
(a) lhc intcmrl prrsnrc P,
(10 t totb)
O) using thc trffir's cirElc for -*!it! detEiE rhr sr.xiEun ittsplte $€.ring strsinrnd dlc lerins d |t| |oSlc I t lnticlclwilc to thc r-ark.
(15 n&b)
Asru € E = 200 cPr, rad v= 0.3.
Frgp:! I
Pg3
5 rnn
ME2rr4
Ou6tior 2
A forcr P is applied to the handle AB of. contol levef, BC as shown in Figurc 2a. The lcv6is pinncd at both ends and has a cross section as shown in Figu.e 2b. It is made of stcel whichhas a yield stess in comprEssion of250 MPa- For a safety ftc'tor of I .5,
(a) det€rmine lhe maximum force P thaf can be applied so that the leve. does not buckle,
(l7 arks)
O) dctcrmine the maximuD forc€ P that cs bc applied if the length of levcr BC isshorl€ned to ,100 mm-
AssumcE=200GPa-
18 nar*s)
Fta'' 2b
Pga
-t-trl
_l_
NATIONAL L]NIVERSITY OF SINGAPOREDepartment of Mechanical Engineering
Session 2003-2004, Semester [ln l)roou,"roo,,
Module Title :
Solution to Question No. Marks
anr'c n 1: --
t
(m. Y - 3ro,.',a3 -'- 2r6D //o r'\h- , )f:o.3
I D.oo a -34 =
- = o ' / r x r o
lx= t(rr- r 'ox\
0-x t vJ07 = +. %=y. >- 3 - r - ( 9 - o ' s o q )
O,+t tA - ) , tOf to \
\ Z
-'- fJ= 4oo t'|h
i.t. Cl= >ao n (a'
LnIc f,ave n-, - ?r p I 36D" J _
4 = . . : _ = ? 6 D
The ubove question hdds not been as*ed in onf preyious test ot exminatiofi papeL
saev, C5 -a7
Date:
Checked By : Date:
mpetaycj
Stamp
NA1IONAL T]NIVERSITY OF SINGA?OREDepaxtment of Mechanical Engineering
Session 2003-2004. Semester I1
Module Code:
Module Titlel
Solution lo Qu€stion No.
q) P= X= (111-yt/a
U 4= iQ- r - - ;o )- _l--, (aa6- otx'")
>dDfrcf '- 6
= t -76D{ to
.f-" -tt< t4ttr\ st-"^ cfrk- e sO"
( ., = g-ct: yL (e' = lho Vkr-x =-- J -=-
Y*'4 - -<+o ( a. ' t ' --c/"ctt ' tsP )
' Y*,r' -- 6to 4t.' J :
-+*e r?#r3 crkle\. /r^ -A!!4 = 9:: /to
-
-6- Y'"0* = t36o t to
- /.L
Als" {t"-"
The fiove question has not becn asked in on! prcvious test or examination pryer.