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PAPER PRESENTATION
ON
OPTIMUM DESIGN ON CONNECTING ROD
Submitted by.,
A.ARULJOTHI
P.SHREEKANTH
FINAL YEAR MECHANICAL ENGINEERING
V.R.S. COLLEGE OF ENGINEERING
TECHNOLOGY,ARASUR,VILLUPURAM Dt.,
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INTRODUCTION
connecting rods-Steel,Aluminium,titanium
magnitude of loads
bending stress caused by the inertialoads
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BASIC DESIGN RULES
Connecting rod length: Connecting rodlength 3 crank radius
3 14.3
42.3mm
inimum !all thickness: "mm
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CONSTRUCTION OF WEB SECTION
( )
2
1 KxxLa
Aca
+
Wcr
=
According to Rankines or!"#a$
Iyy24=Ixx2
Kyy^22^ =Kxx
Fc= Fp= 2795N
Iyy
Ixx=&'(
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DESIGN CRITERIA
Assume both end hinged,
Fcto! o" s"ety "o! #uc$%ing %od = &
#uc$%ing %od 'c!= F
c N1&77(&2795& ==
A!e o" c!oss section, A = 11t2mm4
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)oment o" ine!ti bout *+xis, Ixx =12
419 4t
dius o" gy!tion, Kxx = AIxx
= 1-7.t
/0ui%ent o" !od "o! both end hinged, =% = &1mm
ForA#"!ini"!$
c y =220 N/mm2=
( ) 21 KxxLa
Aca
+
Wcr=
F!om n$ine3s "o!mu%,
( ) 2
2
7.-1&12((
11
1122(
t
t
+
)*+,, =
mmt -=B- so#.ing$
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#A$%&A'%() (* *+A(&+$/aterial roerty-Scalar #alue
aterial )ame -Aluminium
oungs modulus- /.01e" )mm2
oisson ratio-/.34
ass density-0"/ kgm3
'ensile Strength-2/ a
ield Strength -22/ a
*atigue Strength-14/ a
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AIR LOAD CALCULATION
0iston Dia!eter$ D = **'+ !!
De#i.er- 0ress"re = 1 2ar
Net orce acting on t3e 4iston 5FL6/FL = 0ress"re acing on t3e
4iston Area
= 0 5786 D(
= ,'1 5786 **'+(
= (+9: N
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)et force acting on the connecting rod *c5:
;ass o 4iston asse!2#- = ,'(:, kg;ass o connecting rod = ,',*:
kgTota#
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++l
M!Ma 1Weig3t o Reci4rocating 4arts WR=
++ &1-14
1272-((44-(=
= 0.380
Weight of reciprocating parts (WR):
Net Force actin on t!e connectin rod"#Fc$
Fc = F FI 6 ' = 2795 535 + 3.79
= 22&4 N
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odel and boundary condition of theconnecting rod
$oad of 2264) acting on the iston in
odel of connecting rod$oads and 7oundary conditions
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Stress comarison of connecting rod
;a>i!"! stress = && ;4a
;a>i!"! stress= ):'*;4a
Crank
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;a>!i!"! deor!ation = ), ;icrons;a>!i!"! deor!ation = *
;icrons
Crank
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&iscussion
It is "ound tht t!ess induced 15-& )p is e!y %o8 s comp!ed
to the %%o8b%ep!essu!eo" 14()pi-e-, Fcto! o" s"ety is 7- ince it
oe! designed, it is !edesigned
to !educe the mte!i%-
In !an"act"ring 4oint o .ie
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odal analysis of connecting rod:
ode 1: Along the a8is of crank inode 2: erendicular to the a8is
of
*re9uency: 231 ;< *re9uency: "214 ;
