GTU BE/B.Tech 2017 Winter Question Papers || Gujarat Technological University
Enrolment No.
Subject Code: 2170103/2170107
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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII (NEW) EXAMINATION — WINTER 2017
Subject Name: Mechanics of Composite Materials
Date: 10/11/2017
Time: 10:30 AM TO 01:00 PM
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Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| Q.1 | (a) What is composite material? Classify Constituent materials. | 03 |
| (b) What is FRP? Write characteristics and advantages of FRPs. | 04 | |
| (c) Discuss in details anti symmetric laminates. | 07 | |
| Q.2 | (a) Explain Carbon fibres. | 03 |
| (b) The E-glass fibre in a polyester resin is 35% by weight. Given pf = 2.50 gm/ml and pm = 1 gm/ml. Calculate Vf and pc for the lamina. | 04 | |
| (c) Explain the importance of composite materials in today’s world. Also mention the disadvantages and advantages as compared to other materials. | 07 | |
| OR | ||
| (a) Explain A, B and D matrices in detail with proper derivation. | 07 | |
| Q.3 | (a) What are the advantages of fibres over other composite materials? | 03 |
| (b) Write a note on Poisson’s ratio. | 04 | |
| (c) Derive equations for volume and weight fractions. | 07 | |
| OR | ||
| (a) Write a note on Polymeric Matrix. | 03 | |
| (b) Explain the stress strain relationship of a specially orthotropic material and Transversely Isotropic material. | 04 | |
| (c) A high strength composite has the following elastic constants. E11 = 145 GPa, E22 = 12 GPa, G12 = 6 GPa, v12 = 0.25. Determine the transformed reduced stiffness matrix for the lamina with ply angle ? = 45°. | 07 | |
| Q.4 | (a) What is the need of Composite materials in the field of Aviation? Explain in brief. | 03 |
| (b) List down the basic assumptions made for laminate. | 04 | |
| (c) For isotropic materials ‘explain transformation of stress and strain in detail with necessary derivation. | 07 | |
| OR | ||
| (a) Name the methods to find properties of FRCs on the basis of its constituent elements. | 03 | |
| (b) Compare Polyester resins with Epoxy resins. | 04 | |
| (c) Write a note on applications of composite materials. | 07 | |
| Q.5 | (a) Write a note on Aramid fibres. | 03 |
| (b) Write a note on Equilibrium equations. | 04 | |
| (c) Discuss in detail symmetric laminates. | 07 | |
| OR | ||
| (a) What is the need of Fillers? Explain in details. | 03 | |
| (b) Classify the types of laminate configuration. | 04 | |
| (c) Compute [A] matrix for a [0/+45] laminate with the following laminate properties. E1 = 145GPa, E2 = 10.5 GPa, G12 = 7.5GPa, v12 = 0.28 Thickness of each lamina is 0.25 mm. | 07 | |
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