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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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