GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VII (New) EXAMINATION — WINTER 2019
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Subject Code: 2170107
Subject Name: Mechanics of Composite Materials
Time: 10:30 AM TO 01:00 PM
Date: 28/11/2019
Total Marks: 70
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Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
| Q.No. | Question | Marks |
|---|---|---|
| Q.1 (a) | What is the significance of fibre and matrix in composite material? | 03 |
| Q.1 (b) | What is the limitation of a unidirectional lamina? How it can be overcome by laminate? Explain with neat sketch. | 04 |
| Q.1 (c) | Carry out the comparison of composite material with metals in detail. | 07 |
| OR | ||
| Q.2 (a) | Give the classification of composite material. | 03 |
| Q.2 (b) | Define composite material. Explain basic constituent materials of composites | 04 |
| Q.2 (c) | Discuss the applications of composite materials in Aerospace engineering field. | 07 |
| Q.3 (a) | Identify the types of laminate given below.
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| Q.3 (b) | Sketch the variation of stress and strain through a laminate. | 03 |
| Q.3 (c) | Derive Inplane Shear modulus with neat sketch. | 04 |
| OR | ||
| Q.4 (a) | Write a shortnote on [A], [B] and [D] matrices. | 07 |
| Q.4 (b) | What is plane stress assumption? | 03 |
| Q.4 (c) | Determine the transverse modulus of a unidirectional lamina with neat sketch. | 04 |
| OR | ||
| Q.5 (a) | Derive Strain-Displacement relationship of a laminate using a neat sketch. | 07 |
| Q.5 (b) | Write down the difference between micromechanics and macromechanics. | 03 |
| Q.5 (c) | Write a short note on Poisson’s ratio. | 04 |
| OR | ||
| Q.6 (a) | Write down the advantages and disadvantages of composite material. | 07 |
| Q.6 (b) | What is Prepeg? Explain. | 03 |
| Q.6 (c) | Write down the significance of fillers and additives in composite materials in detail. | 04 |
| Q.7 (a) | Derive the relationship between E1, E2, G12 and v12 for different materials. Explain in detail with the use of stress-strain relations and neat sketches. | 07 |
| Q.7 (b) | What is particulate composites? | 03 |
| Q.7 (c) | Write a short note on symmetric laminate. | 04 |
| OR | ||
| Q.8 (a) | Derive the equations for volume fractions, weight fractions and density of composite material. | 07 |
| Q.8 (b) | What do you mean by balanced laminate | 03 |
| Q.8 (c) | Write a short note on anti-symmetric laminate. | 04 |
| OR | ||
| Q.9 (a) | Discuss the application of composite materials in Automotive and Marine fields. | 07 |
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