bhm1123-mechanics of materials 11415
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L
n i v e r s i t i
j M a la y s ia
P H N G
Engineering Technoogy Cratity
FACULTY OF MANUFACTURING ENGINEERING
FINAL EXAMINATION
COURSE
ECHANICS OF MATERIALS
COURSE CODE
FF1133/BHM1 123
LECTURER
R. AKM ASIF IQBAL
DATE
JANUARY 2015
DURATION
HOURS
SESSION SEMESTER :
ESSION 2014/2015 SEMESTE R I
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k
L2rn
CONFIDENTIAL
FF/BHMI1415I/BFF1133/BHM1 123
QUESTION 1
[ 5
M A R K S ]
a The truss is made from three pin-connected members having the cross-sectional areas
shown in the
Figure la.
D etermine the average n ormal stress developed in each mem ber
when the truss is subjected to the load
P
=
2 5
kN shown in the figure State whether the
stress is tensile or compressive
12 M arks)
Figure la
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CONFIDENTIAL
FF/BHM /141511BFF1133 /BHM 1 123
QUESTION
2
[25 MARK S]
a
If the gap between
C
and the rigid wall at
D
is initially 0.15 mm as shown in
Figure 2a,
determine the support reactions at
A
and
D
when the force
= 200 kN is applied. The
assembly is made of A-36 steel. E
t
= 200GPa .
10 Marks)
Figure 2a
b
The assembly consists of three titanium Ti-6A1-4V) rods and a rigid bar
AC.
The cross-
sectional area of each rod is given in the
Figure 2b
If a force of 30 kN is applied to the
F.
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CONFIDENTIAL
FFIBHM I1415I JBFF1 1331BHM 1123
QUE STION 3 [25 MARKS]
a
The A 36 steel shaft has a diameter of
50
mm and is fixed at its ends
A
and
B
If it is
subjected to the torque shown in
Figure 3a
determine the maximum shear stress in
regions
AC
and
CB
of the shaft.
12 Marks)
30ONm
03 r
Figure 3a
b
The motor,
shown in Figure 3b
delivers 32 kW to the 304 stainless steel solid shaft while
it rotates at 20 Hz. The shaft has a diameter of
37 5
mm and is supported on smooth
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C O N F I D E N T I A L
FF/B IIMJ1415I IB FF1 133IB HM1 123
QUE STION 4 [25 MARKS]
a D raw the shear and moment diagrams for the beam shown in Figure
4 a
13 Marks)
kN/rn
45 kNm
LSrn
3m
.Sm,
Figure 4a
b
The steel beam has the cross sectional area as shown in
Figure 4b
If
w
=
7
kN/m,
determine the absolute maximum bending stress in the beam.
12 Marks)
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CONFIDENTIAL
FF/BHM/1415I IBFF1133IBHM1 123
QUEST ION 5 [25 MA RKS]
a
If the wide flange beam as shown in
Figure 5a
is subjected to a shear of
0 kN,
determine the maximum shear stress in the beam.
10 Marks)
200 mm
3 mm
25mm
V
250
m m
mm
Figure 5a
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Average Mechanical Properties of Typical Engineering Materials '
(SI U nits)
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het
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