mme-505_4
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Q3)
a)
b)
Qa) a)
Disct-iss
n
cletail
he
curvecl
urface
ontact
tresses
s
appliecl
o
rolling
bodies.
why
it
calied
a surface
atigue
phenomenon.
Give
practic,al
examples
where
hese
stresses
re
predominant.
what
is
creep?
Explain
he
causes
nd
nterpretation
f
failures
n low
cycle
atigue.
Thescience f "fracturemechanics" xplainsandpredictsuddel
failure
phenomenon.
xplain
the
stateurent
y
giving
practical
examples.
what
are
he
causes
nd
areas
where
sudden
ailure
takes
place.
Explain
the
steps
o be
aken
or
design
a componeniagainst
reep.
Also
discuss
reep
n low
carbon
steel
using
creep
deformation
ersus
ime
plot.
Explain
he
erms,
eliabilitv,
maintainability
nd
availability
n
the
design
of
machine
omponents.
ive
practical
xamples
hile
explaining
aih
terTn.
Therolling contactbearings re o beselectedor supporting
verhung
countershaft.
The
shaft
speed
n
720
r.p.m.
The
bearirrg,
ur.
to
hav
99o/i
eliability
corresponding
o 24000
hrs.
The
bearings
are
subjected
to
an
equivalent
adial
oad
of
1KN.
Consider
he
ife
adjustment
actors
as
0.9
and
0.85 respectively.
alculate
he
basic
clynamic
oad
rating,
specifi
d
at
9
oh reliability.
Explain
the
surgephenomenon
n
springs.
A bolted
oint
is
formed
br
a
pressure
essel
n
which
he
bolt
s
ightened
with
an initial
pre-load
of
7000N.
The
external
oad
on
the
bolt
varies
frorn
0 to
9000N.
f
"=t=U5,
find
he
size
of
the
bolt.
For
bort
material
take
{w
=260
N/mm2,
enclurance
imit
in
reversed
xial
oading
=
130
N/mm2.
Factor
of
safetl,
f
3
on
soderberg
ine
and
stress
oncentration
factor
of 2.8.
Describe
n
detail.vjttous
reas
.f
application
f
computer
or
design.
How
do
you
classiff
the
appiication
of computer
or
man,facturing.
what
are
he
be'efits
of using
computer
or
design
work?
what are the r:rathematicaloncepts equirecin the ,,finite
eiement
analysis"',)
\ \ 'hat
i ,u
?n
interpo. lat ion
unct ion'7
clv
does
he
select ion
f
an
rnterltclation
'unction
fl-ect
i-re
olution
utcome.
Explain
with
the
help
of
a neat
ketch,
he
ocal
co-orclinates
ndglobal
c:o-ordinates
n
FEM
mesh.
b)
Qs)
a)
b)
Q6)
a)
b)
87)
Q8) a)
b)
c )
a)
b)
c )
R- I 492
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