Download JNTUA B.Tech 4-2 R13 2018 April 13A03803 Composite Materials Question Paper

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Code: 13A03803

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B.Tech IV Year II Semester (R13) Regular & Supplementary Examinations April 2018

COMPOSITE MATERIALS

(Mechanical Engineering)

Time: 3 hours

Max. Marks: 70

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PART - A

(Compulsory Question)

Answer the following: (10 X 02 = 20 Marks)

1. Define composite.
2. Give examples for natural composites.

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3. List down various composites manufacturing methods.
4. List the assumptions made during the macro mechanical analysis of a lamina.
5. Define isotropic material.
6. Define coefficients of moisture expansion.
7. Write down stress strain relationship for a laminate.

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8. Define flexural modulus.
9. List the failure criterion used for a laminate.
10. List any two applications of laminates.

PART - B

(Answer all five units, 5 X 10 = 50 Marks)

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UNIT - I

1. Discuss briefly the functions of the matrix and the reinforcements used in composites. Give the classification of composites.

   OR

2. Sketch and describe liquid metallurgy route of processing composite materials.

UNIT - II

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1. Sketch and describe Autoclave process.

   OR

2. With a neat sketch, describe Hand layup process.

UNIT - III

1. Derive an equation for the stiffness and compliance matrix for an isotropic material.

   OR

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2. A tensile load of 5000 N is applied to a plastic glass fiber composite of 100 mm² cross section area with 25% volume percentage of glass. Calculate the cross sectional area of plastic alone without reinforcement to withstand the same load with same elastic deformation. Given E_plastic = 0.356 N/m², E_fibre = 70 GN/m².

UNIT - IV

1. Differentiate between lamina and laminate.

   OR

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2. What are Hygro thermal stresses? Explain briefly the same.

UNIT - V

1. Write short notes on:
   1. Distortion energy failure theory.
   2. Tsai-Hill failure theory.

   OR

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2. Describe briefly maximum strain failure theory.