D

Reg No.:

100004 0407122001 Pages: 2

Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

Seventh Semester B.Tech Degree Examination (Regular and Supplementary), December 2020

Max. Marks: 100

1 ஐ
b)
0)

2

3 a)
b)

4

5

6

7

8

Course Code: ൧0407
Course Name: COMPOSITE MATERIALS

PARTA
Answer any three full questions, each carries 10 marks.

Differentiate between alloys and composites.
Define Strength ratio.
Give the upper limit of operating temperatures of polymer, metal, and ceramic
composites.
Define a composite material and explain the classifications of composites
according to reinforcement and matrix used.
Illustrate the variation of stress and strain in a composite laminate with suitable
diagram.
Write the Hooke’s law for isotropic Material in the form of Stiffness matrix and
compliance matrix.
Show the reduction of Anisotropic Material Stress-Strain Equation to those of
Monoclinic Stress-Strain Equation.

PART ‏تا‎

Answer any three full questions, each carries 10 marks.

Derive the extensional [A], coupling [B], and bending [D] stiffness matrices for
the force and Moment Resultants Related to Mid-plane Strains and Curvatures in
a Laminates.
Compute [A] matrix for [0 / +45] laminate with the following laminate
properties. E;=14S5apa, E,=10.Sapa, 1220.28 and Gj2=7.5apa. Thickness of
each lamina is 0.25mm
Explain the different types of repair techniques used in composite materials.
Explain centrifugal casting and continuous lamination technique process of FRP

with appropriate diagram.

Page lof 2

Duration: 3 Hours

Marks

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