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

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Code: 13A03803


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

Time: 3 hours Max. Marks: 70

PART ? A
(Compulsory Question)

*****
1 Answer the following: (10 X 02 = 20 Marks)
(a) Define composite.
(b) Give examples for natural composites.
(c) List down various composites manufacturing methods.
(d) List the assumptions made during the macro mechanical analysis of a lamina.
(e) Define isotropic material.
(f) Define coefficients of moisture expansion.
(g) Write down stress strain relationship for a laminate.
(h) Define flexural modulus.
(i) List the failure criterion used for a laminate.
(j) List any two applications of laminates.

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

UNIT ? I

2 Discuss briefly the functions of the matrix and the reinforcements used in composites. Give the
classification of composites.
OR
3 Sketch and describe liquid metallurgy route of processing composite materials.

UNIT ? II

4 Sketch and describe Autoclave process.
OR
5 With a neat sketch, describe Hand layup process.

UNIT ? III

6 Derive an equation for the stiffness and compliance matrix for an isotropic material.
OR
7 A tensile load of 5000 N is applied to a plastic glass fiber composite of 100 mm
2
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/m
2
,
E
fibre
= 70 GN/m
2
.

UNIT ? IV

8 Differentiate between lamina and laminate.
OR
9 What are Hygro thermal stresses? Explain briefly the same.

UNIT ? V

10 Write short notes on:
(a) Distortion energy failure theory.
(b) Tsai-Hill failure theory.
OR
11 Describe briefly maximum strain failure theory.

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R13/SS
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