Download JNTUA M.Tech 1st Sem 2018 Regular Feb 9D15104 Fracture Fatigue And Creep Deformation Question Paper

Download JNTUA (JNTU Anantapur) M.Tech ( Master of Technology) 1st Semester 2018 Regular Feb 9D15104 Fracture Fatigue And Creep Deformation Previous Question Paper

Code: 9D15104

M.Tech I Semester Supplementary Examinations February/March 2018
FRACTURE, FATIGUE & CREEP DEFORMATION
(Machine Design)
(For students admitted in 2012, 2013, 2014, 2015 & 2016 only)

Time: 3 hours Max. Marks: 60
Answer any FIVE questions
All questions carry equal marks
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1 Explain the fracture behavior of ductile and brittle materials at elevated temperatures.

2 Derive the expression for energy release rate G at load control and at displacement control.

3 Write short notes on:
(a) Stress concentration factor of crack tip.
(b) Stress intensity factor of material.

4 Discuss about plastic zone size through the Dugdale approach.

5 Why is the Ramberg-Osgood relation convenient for determining the J-integral for elastic-
plastic material?

6 Define fracture. Discuss about the cleavage type of fracture failure in ductile material.

7 Write short notes on:
(a) Goodman?s rule and Miners rules.
(b) Mean stress R ratio.
(c) Strain and load controls of fatigue.

8 What do you mean by creep? Explain the micro mechanism of creep in materials.

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