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

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Code: 9D15104

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Time: 3 hours

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)

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Answer any FIVE questions

All questions carry equal marks

Max. Marks: 60

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.

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3. Write short notes on:
   1. Stress concentration factor of crack tip.
   2. 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?

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6. Define fracture. Discuss about the cleavage type of fracture failure in ductile material.
7. Write short notes on:
   1. Goodman's rule and Miners rules.
   2. Mean stress R ratio.
   3. Strain and load controls of fatigue.

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

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