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# CMS QB

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PARK COLLEGE OF ENGINEERING AND TECHNOLOGY

Kaniyur, Coimbatore – 641 659  (Affiliated to Anna University, ISO 9001 : 2008 Certified) (Approved by AICTE, Accredited by National Board of Accreditation, Accredited by NAAC)

DEPARTMENT OF AERONAUTICAL ENGINEERING

MODEL TEST COMPOSITE MATERIALS AND STRUCTURES (AE2451) Department

Year

Section

AERO

IV

A&B

Date 12.04.2016 (FN)

Duration: 3 Hours Maximum: 100 Marks PART A

(10 X 2 = 20)

2

What are the major constituents in composite materials?   Define a laminate?

3

List down the reinforcement materials and resins used in composite materials.

4

What is the difference between isotropic and anisotropic material?

5

What is major Poisson’s Poisson’s ratio?  ratio?

6

How local and global stresses are related? Define cross ply laminate and angle ply laminate.

1

7 8 9 10

What is strength ratio? List down the advantages using a sandwich construction. What is pre-preg? PART B

11

a

( 5 X 16 = 80)

(i) Discuss the classifications and different applications of composite materials (ii) State State the generalized Hooke’s law  law  applied for composite materials and explain.

(10) (6)

OR

11

12

For a graphite/epoxy unidirectional lamina, find the following. (a) Compliance matrix. (b) Minor poisons ratio. b (c) Reduced stiffness matrix. (d) Strains in the 1-2 co-ordinate system if the applied stresses are σ1 =2MPa, σ2= -3MPa, τ12= 4MPa, E1=181GPa, E2=10.3 GPa, ν GPa,  ν12 =0.28, G12=7.17 GPa.

a

(i) Discuss (1) Tensile (2) Impact behavior of composites with suitable examples. (ii) Discuss about fiber reinforced and particle reinforced composites and compare them.

(16)

(10) (6)

OR 12

b Explain the elasticity approach to find four different elastic moduli .

(16)

13

(i) With the help of illustrations , explain the different failure criteria for composites a (ii) Explain the construction, properties and applications of angle ply laminates.

(10) (6)

OR

13

b Compare Tsai-Hill theory and Tsai-Wu theory along with the limitations if any.

14

(i) Obtain an expression for the flexural modulus modulus of a (1) Sandwich plate with different face thickness. a (2) Sandwich plate with different face thickness and material.

(16)

(16)

OR

(i) Describing the various methods of fabricating sandwich panels. Also compare their merits b and limitations. (16)

15

a

(i) Explain open and closed mould processes. processes. (ii)Explain with neat sketches one fabrication process under each method.

(10) (6)

OR b Explain about netting analysis approach.

(16)

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