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Reg. No. Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
THIRD SEMESTER B.TECH DEGREE EXAMINATION JANUARY 2017

ME 201: MECHANICS OF SOLIDS
(AU, MA, ME, MP, MT, PE, SF)

Maximum Marks: 100 Time : 3 Hours
PART-A
Answer any three questions.

1. a) Explain the stress-strain curve of a mild steel bar in tension test. (5)

b) A straight bar 450 mmlong is 40 mm in diameter for the first 250 mm length and 20
mm diameter for the remaining length. If the bar is subjected to an axial pull of 15 kN find
the maximum and minimum stresses produced in it and the total extension of the bar. Take E

=2x 10° N/mm’. (5)

2. A bar made of brass and steel as shown in 115.1 is held between two rigid supports A
and C.Find the stresses in each material if the temperature rises by 40°C. Take E, = 12
10° N/mm” ‏مہ:‎ = 19 x 105/50 , E,=2 10° N/mm’; 0७ = 12% 10°/°C

20 ന്നാ ಲ ಫಾ

Fig: 1 (10)

3. a) What is astress tensor? Explain different ranks of a tensor. (5)
b) A cylindrical bar is 20 mm diameter and 800 mm long. During a tensile test it is
found that the longitudinal strain is 4 times the lateral strain. Calculate the modulus of
rigidity and the bulk modulus, if its elastic modulus is 1× 10° N/mm”. Find the change in
volume, when the bar is subjected to a hydrostatic pressure of 100 N/mm. (5)

4. Asolid shaft of 6m length is securely fixed at each end. A torque of 80 Nm is applied to

the shaft at a section 2 m from one end.

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