Download JNTUA B.Tech 4-2 R15 2019 April Regular 15A03803 Composite Materials Question Paper

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Code: 15A03803


B.Tech IV Year II Semester (R15) Regular Examinations April 2019
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 flake composites.
(b) Define thermoplastics.
(c) What is pultruded in FRP?
(d) Write the stiffness matrix for orthotropic material.
(e) Define volume and mass fraction.
(f) What is the primary function of the matrix in a composite material?
(g) What is the importance of cross-ply laminates?
(h) What is lamination theory?
(i) Write the equation of maximum stress failure criterion of composite materials.
(j) What is failure envelop.

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

UNIT ? I

2 Briefly describe the classification of composites.
OR
3 With the help of a neat sketch, explain the production of boron fibers.

UNIT ? II

4 Explain the following methods of manufacturing PMC?s with suitable sketches:
(a) Pultrusion.
(b) Prepregs.
OR
5 Derive the stress-strain relations for an orthotropic lamina in three dimensional domains in terms of
engineering constants.

UNIT ? III

6 Derive the expressions to and G
12
in terms of constituent properties using micromechanics
principles.
OR
7 Find the coefficient of thermal expansion for a 60
o
angle lamina of glass/epoxy whose longitudinal
and transverse coefficients of thermal expansion are 8.6 X 10
-6
m/m/
o
C and 22.1 X 10
-6
m/m/
o
C
respectively.

UNIT ? IV

8 Briefly explain inter laminar stresses in a laminate composites.
OR
9 Write the assumptions of CLT and derive the stress strain relations for a classical laminate and
represent the stress-strain variation in a laminate.

UNIT ? V

10 What are the advantages of composites in structural design? Explain.
OR
11 Write short notes on the following:
(a) Maximum stress failure theory.
(b) Failure envelops.
*****
R15
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