Fatique On Piston Ring
Fatique On Piston Ring
Fatique On Piston Ring
Mr.K.Kadambanathan, 2E.Selvan
ABSTRACT
Elastic finite element models were used to calculate the stresses in a diesel piston ring, for centrifugal forces,
gas pressure, piston-to-cylinder contact and thermo-mechanical loading. A fatigue analysis superimposed the four
loading conditions and calculated the fatigue life at each node on the model, adjusting the materials fatigue
properties for the effects of nodal temperature. The identification of fatigue-critical locations, and the calculated
fatigue lives, showed good agreement with test results
This work is concerned only with the analysis of fatigue-damaged pistons ring. Pistons from petrol and diesel
engines, from automobiles, motorcycles and trains will be analyzed. Damages initiated at the crown, ring grooves,
pin hole sand skirt are assessed. A compendium of case studies of fatigue-damaged pistons is presented. An analysis
of both thermal fatigue and mechanical fatigue damages is presented and analyzed in this work
1. INTRODUCTION.
different
164
origins:
mechanical
stresses;
thermal
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and
high
temperature
mechanical
mechanical
and
high
temperature
analysis
technique
for
obtaining
approximate
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industry.
Microstructure:
distributed
network
Mechanical properties:
Hardness: 200 - 280 HB
solution.
C: 2.9 -
Compression Rings
Mechanical properties:
Hardness: 220 - 280 HB 2.5/187.5
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V.APPLIED LOADS
The in-piston ring compressive load has
been determined from an actual engine running
critical load cases on ring at various conditions such
etc. and is applied on piston ring outer side. The
compressive load is found to be 420Mba.
The details of the compression ring
1
ELEMENTS
: 56mm
: 3mm
: 420Mp
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15:05:51
Y
X
Z
1
ELEMENTS
DEC 7 2012
15:11:28
1
VOLUMES
DEC 7 2012
15:02:38
TYPE NUM
Y
Z
Y
Z
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DISPLACEMENT ARESST
1
DISPLACEMENT
DEC 7 2012
15:24:18
STEP=1
SUB =1
TIME=1
DMX =10317
1
ELEMENTS
DEC 7 2012
15:19:52
U
F
Y
Z
Y
Z
STEP=1
SUB =1
TIME=1
UX
(AVG)
RSYS=0
DMX =10317
SMN =-1469
SMX =2581
ELEMENTS
DEC 7 2012
15:18:44
U
F
MX
MN
Z
-1469
-1019
-568.838
-118.894
331.05
780.994
1231
1681
2131
2581
1
NODAL SOLUTION
DEC 7 2012
15:27:06
STEP=1
SUB =1
TIME=1
SXY
(AVG)
RSYS=0
DMX =10317
SMN =-.217E+08
SMX =.497E+08
-.138E+08
-.584E+07
.210E+07
.100E+08
.180E+08
.259E+08
.339E+08
.418E+08
.497E+08
factor
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particular
processing technologies,
mechanical
and
high
temperature
REFERENCE
information
[2]
material.
[3]
results
2002;23(4):42934.
[4]
FUTURE WORK
modeling
Work is continuing on algorithms to calculate
injection
of
the
diesel
in-cylinder
flow
engines.
in
direct-
Computer
Fluids2004;33(8):9951021.
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