Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2017 Winter 7th Sem New 21701032170107 Mechanics Of Composite Materials Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VII (NEW) EXAMINATION ? WINTER 2017
Subject Code: 2170103/2170107 Date: 10/11/2017
Subject Name: Mechanics of Composite Materials
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) What is composite material? Classify Constituent materials. 03
(b) What is FRP? Write characteristics and advantages of FRPs. 04
(c) Discuss in details anti symmetric laminates. 07
Q.2 (a) Explain Carbon fibres. 03
(b) The E-glass fibre in a polyester resin is 35% by weight. Given ?f = 2.50
gm/ml and ?m = 1 gm/ml. Calculate Vf and ?c for the lamina.
04
(c) Explain the importance of composite materials in today?s world. Also
mention the disadvantages and advantages as compared to other materials.
07
OR
(c) Explain A, B and D matrices in detail with proper derivation. 07
Q.3 (a) What are the advantages of fibres over other composite materials? 03
(b) Write a note on Poisson?s ratio. 04
(c) Derive equations for volume and weight fractions. 07
OR
Q.3 (a) Write a note on Polymeric Matrix. 03
(b) Explain the stress strain relationship of a specially orthotropic material and
Transversely Isotropic material.
04
(c) A high strength composite has the following elastic constants.
E1 = 145 GPa, E2 = 12 GPa, E6 = 6 GPa, v12 = 0.25. Determine the
transformed reduced stiffness matrix for the lamina with ply angle ? = 45
o
.
07
Q.4 (a) What is the need of Composite materials in the field of Aviation? Explain id
brief.
03
(b) List down the basic assumptions made for laminate. 04
(c) For isotropic materials explain transformation of stress and strain in detail
with necessary derivation.
07
OR
Q.4 (a) Name the methods to find properties of FRCs on the basis of its constituent
elements.
03
(b) Compare Polyester resins with Epoxy resins. 04
(c) Write a note on applications of composite materials. 07
Q.5 (a) Write a note on Aramid fibres. 03
(b) Write a note on Equilibrium equations. 04
(c) Discuss in detail symmetric laminates. 07
OR
Q.5 (a) What is the need of Fillers? Explain in details. 03
(b) Classify the types of laminate configuration. 04
(c) Compute [A] matrix for a [0??45] laminate with the following laminate
properties. E 1 = 145GPa, E 2 = 10.5 GPa, E 6 = 7.5GPa, v 12 = 0.28 Thickness of
each lamina is 0.25 mm.
07
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This post was last modified on 20 February 2020