This download link is referred from the post: JNTUA M.Tech 1st Sem last 10 year 2010-2020 Previous Question Papers (JNTU Anantapur)
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Code: 9D15104
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M.Tech I Semester Supplementary Examinations August/September 2018
FRACTURE, FATIGUE & CREEP DEFORMATION
(Machine Design)
(For students admitted in 2013, 2014, 2015 & 2016 only)
Time: 3 hours
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Max. Marks: 60
Answer any FIVE questions
All questions carry equal marks
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- (a) Define fracture. What are the different modes of fracture failure in materials?
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(b) Explain different modes of crack opening. - Explain Griffith's theory and also compare this theory to Irwin-Orwin extension.
- Explain briefly the ductile/brittle fracture transition temperature for notched and unnotched components.
- With the help of a neat sketch, explain the process of crack initiation and explain the stages of crack initiation.
- Determine the value of K₁ for the following cases:
- Single edge cracked plate under uniform tension a = 15 mm, W = 120 mm subjected to 250 MPa.
- Center-cracked plate under uniform tension; 2a = 30 mm, 2W = 150 mm, subjected to 250 MPa.
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- (a) Discuss in detail the significance and test methods for fracture toughness.
(b) Explain the effect of metallurgical variables on fatigue properties. - Explain the term fatigue cycle. Explain the fatigue crack closure mechanism in metals with suitable sketch.
- (a) Explain the role of diffusion in creep deformation.
(b) Discuss the effect of overload during fatigue crack propagation.
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This download link is referred from the post: JNTUA M.Tech 1st Sem last 10 year 2010-2020 Previous Question Papers (JNTU Anantapur)