B.E-B.E Aeronautical Engineering Aircraft Materials(Sathyabama University, Chennai, Tamil Nadu-2010)
Friday, 23 August 2013 02:23Duraimani
(Established under section 3 of UGC Act,1956)
Course & Branch :B.E - AERO
Title of the Paper :Aircraft Materials Max. Marks :80
Sub. Code :526406/626404 Time : 3 Hours
Date :26/04/2010 Session :FN
PART - A (10 x 2 = 20)
Answer ALL the Questions
1. Draw the crystal structure of aluminum.
2. What is known as atomic packing factor?
3. Draw stress-strain diagram for mild steel.
4. Define endurance limit in fatigue test.
5. Define strain hardening.
6. What is the purpose of tempering heat treatment for steels?
7. Differentiate between corrosion and erosion.
8. What is stress corrosion cracking?
9. Mention any two applications of composite materials.
10. Name any two metal-matrix composites.
PART – B (5 x 12 = 60)
Answer All the Questions
11. Describe the various imperfections in crystals and their effects on properties.
(or)
12. Explain the different types of point defects and line defects in crystal structures with neat sketches.
13. Explain:
(a) Strain hardening (4)
(b) Elastic after effect (4)
(c) Bauschinger’s effect (4)
(or)
14. (a) Distinguish between ductile fracture and brittle fracture. (8)
(b) What is the mechanism of hardening in strain hardening process? (4)
15. What are galvanic corrosion and crevice corrosion? How are they caused?
(or)
16. Explain any three plating processes used in aircraft application to protect against corrosion.
17. Explain the steps in precipitation hardening using any one aluminum alloy as examples.
(or)
18. (a) What are the requirements of aircraft materials? (6)
(b) Explain the usage of steels and composites in aircraft. (6)
19. (a) Explain the construction method of TTT diagram for 0.8% C steel. (8)
(b) Explain Austempering. (4)
(or)
20. Explain :
(a) Annealing (4)
(b) Normalizing (4)
(c) Flame hardening (4)
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