Preston
UniversityIslamabad
campus
FallSemester
2015
Mechanics
of
MaterialsAssignmentB.Tech(hons)
Semester
Ensr.
Haseeb
Ahmed
Subject
Name:Class
Name:
Teacher
Name:
Total
Marks:
50
Note:
Attempt
all
review
questions
and
all
questions
carryequal
marks.
Q.
1:
Determine
theaverage
Normal
Stressdeveloped
in
rod
ABif
load
has
a
mass
of
50Kg.the
diameter
of
rod
AB
is8mm?
c
[3
t
r
Q.
2:
Therigidbeam
is
supported
by
a
pin
at
A
and
wires
BD
andCE.
If
the
load
P
onthe
beamcausestheend
C
to
be
displaced
10mm
downward,
determine
the
normalstrain
developed
in
wires
CE
and
BD?
ISfr
T*
ft
c
£
~a«
**
Q.
3:
Thewire
has
a
diameter
of
5mm
and
ismade
from
A36steel.
If
a80Kg
man
is
sittingon
a
seat
C,
Determine
the
elongation
of
wire
DE?
1
vi
ÿ>«*
.
1
6oo '«*'
Q.
4:
Thesegments
AB
and
CD
of
theassembly
are
solidcircular
rods,
and
segments
BC
is
a
tube.
If
the
assembly
is
made
of
6061T6
Aluminum;
determine
the
displacementofthe
end
D
with
respect
to
end
A?
Boofnpo
Preston
UniversityIslamabad
campus
2.0
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OO
Q.
5:
If
a
motor
delivers
lOhp
tothe
shaftand
shaft
rotates
at1200rpm,
determines
the
torque
producedby
themotor?
Q.
6:
Draw
the
shear
force
and
bending
moment
diagram
for
the
beam?
i
*
I
SKI*
Q.7:
If
the
beam
issubjected
to
a
shear
force
of
V=100kN,determine
theshear
stressdeveloped
at
point
A.
Represent
the
state
of
the
stress
on
a
volume
element
at
this
point?
v
5Joerri
t*'
4ÿ
_4l
~X00
rr
rC
*
Q.
8:
A
pressurized
spherical
tank
is
to
bemade
of
0.5inthicksteel.
If
it
is
subjected
to
an
internal
2o«r>»
pressure
of
p=200psi,
determine
its
outer
radius
if
the
maximumnormal
stress
is
nottoo
exceed
15ksi.
Q.
9:
Determine
the
equivalent
state
of
thestressonanelement
at
the
samepointthat
represents
the
maximum
inplaneshear
stress
at
the
point?
nooKPo.
\OOfcPft.
OOKPo
r
Q.
10:
Determine
the
minimum
dimension‘a’
to
thenearestofthe
beam’s
cross
section
to
safely
support
theload.
The
wood
has
an
allowable
normal
stressof
aaii0w=
12MPa
and
an
allowable
shear
stress
of
xaiiow=
1.5MPa
/
15W
I*
X
a

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