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

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Code: 13A03803


B.Tech IV Year II Semester (R13) Advanced Supplementary Examinations July 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) What are the applications of composite materials?
(b) Differentiate between thermoplastics and thermosets.
(c) What is pultrusion?
(d) Define strain energy.
(e) Explain briefly about the ply architecture.
(f) Explain Hooke?s law for a two dimensional unidirectional lamina.
(g) What are the assumptions made in developing stress strain relationships?
(h) Write the steps for analyzing a laminated composite subjected to the applied forces and moments.
(i) What is failure envelope?
(j) Explain Tsai- Hill theory.

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

UNIT ? I

2 (a) Explain briefly various applications of FRP.
(b) Explain briefly classification and characteristics of composite materials.
OR
3 (a) Explain particulate composites and polymer composites with examples.
(b) Explain the basic terminology in fiber reinforced composite laminates.

UNIT ? II

4 What are the different types of fabrication methods of composites? Explain die molding.
OR
5 Find the compliance and stiffness matrix for a graphite/epoxy lamina. The material properties are given
as: E
1
= 181 GPa, E
2
= 10.3 GPa, E
3
= 10.3 GPa, ?
12
= 0.28, ?
23
= 0.6, ?
13
= 0.27
G
12
= 7.17 GPa, G
23
= 3.0 GPa, G
31
= 7.0 GPa.

UNIT ? III

6 Write stress ? strain relations for a unidirectional lamina in terms of engineering constants referred to an
arbitrary coordinate system (x, y).
OR
7 Explain the basic approaches to the micromechanics of composite materials.

UNIT ? IV

8 Explain the following:
(a) Warpage of laminates.
(b) Hygrothermal effects in a laminate.
OR
9 Derive the effective in-plane engineering constants for a laminate.

UNIT ? V

10 What are the different failure methods of composites? Explain.
OR
11 Determine the first-ply failure strength of a [0/90]s laminate under uniaxial tension or compression based
on: (i) The maximum stress criterion. (ii) Tsai-Wu criterion. (Assume any missing data)
*****
R13/SS
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