B3B035S Pages: 3

Reg. No. Name:

APJ ABUL KALAM TECHNOLOGICAL UNIVERSITY THIRD SEMESTER B.TECH
DEGREE EXAMINATION, JULY 2017

CE 201: MECHANICS OF SOLIDS (CE)
Max. Marks:100 Duration: 3 Hours

PARTA
Answer any 2 complete questions each having 15 marks

1. (a) In an experiment, a bar of 30 mm diameter is subjected to a pull of 60 KN. The measured
extension on a guage length of 200 mm is 0.09 mm and the change in diameter is 0.0039

mm. Calculate the Poisson’s ratio and the value of the three moduli. (10)

(b) Define the terms stress and strain. What ate the different types of stresses and strains?
(5)

2. (a) A compound bar consists of a circular rod of steel of diameter 20 mm rigidly fitted into
a copper tube of internal diameter 20 mm and thickness 5 mm. If the bar is subjected to a
load of 100 kN , find the stresses developed in the two materials. Take Es = 2x 10°
N/mm? and Ec =1.2x10° N/mm? (10)

(b) What is strain energy? Give the expression for strain energy due to axial force.
(5)

3. (a) A railway line is laid so that there is no stress in the rails at 8°C. Calculate (a) the stress
on the rails at 50°C if there is no allowance for expansion. (b) the stress in the rails if there
is an expansion allowance of 8 mm. (c) the expansion allowance if the stress in the rails is
to be zero . (d) the maximum temperature to have no stress in the rails if the expansion
allowance is 12 mm. The rails are 30 mm long. Take 0० = 12 X 10° per °C and

۲: = 2 × 105 N/mm2 )10(

(b)Derive the expression for deformation of a bar of constant section due to self weight.

(5)

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