COMPOSITE MATERIALS – Anna University Previous year Model Question Paper Nov/Dec 2011 ...

COMPOSITE MATERIALS – Anna University Previous year Model Question Paper Nov/Dec 2011 ...

Posted by R.Anirudhan

Seventh Semester
Mechanical Engineering
(Regulation 2008)
Time : Three hours Maximum : 100 marks
Answer ALL questions.
PART A — (10 × 2 = 20 marks)
1. What is the role of matrix in composites?
2. State generalized Hooke’s Law.
3. What are the basic assumptions of laminated anisotropic plates?
4. What is meant by quasi-isotropic laminates?
5. What are the basic assumptions in Von Mises Yield criterion for isotropic materials?
6. How is laminate failure predicted?
7. What are the assumptions in thermal analysis of laminates?
8. What is meant by zero CTE laminates?
9. Write equilibrium equation of motion.
10. How does the static bending analysis of cross ply laminates differ from others?
PART B — (5 × 16 = 80 marks) 
11. (a) What are the different types of fibers used in composites? Explain any three of them.
(b) (i) Explain compression moulding process with a neat sketch. (8)
(ii) Derive the rule of mixture for calculating Young’s Modulus of an aligned
fibre reinforced composite loaded parallel to the direction of fiber orientation. (8)
12. (a) Explain the evaluation of lamina properties from laminate tests.
(b) Write short notes on :
(i) Balanced laminates and
(ii) Angle ply laminates. (8 + 
13. (a) A composite consists of 40 Vol % fibers of diameter 100 microns. If the strength of
fiber is 3 GPa, that of the matrix is 80 MPa and the interfacial steam strength is 60
MPa. Determine the composite fracture strength for filament length at
(i) 100 micron and
(ii) 2 mm. (8 + 8)
(b) Write short notes on :
(i) Hill’s criterion for anisotropic materials and
(ii) Tsai-Hill’s failure criterion for composites. (8 + 8)
14. (a) Explain the CTE’s for unidirectional and off-axis laminates. (8 +8) 
(b) Write in detail on thermally quasi isotropic laminates.
15. (a) Explain the buckling analysis of symmetric laminates and cross ply laminates.
(b) Explain the free vibration of laminated composite plates subjected to a thermal
loading with general boundary conditions.

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