Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 7th Sem 2170107 Mechanics Of Composite Materials Previous Question Paper
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?VII (NEW) EXAMINATION ? WINTER 2020
Subject Code:2170107 Date:25/01/2021
Subject Name:Mechanics of Composite Materials
Time:10:30 AM TO 12:30 PM Total Marks: 56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Define the term Composite Material and its various types.
03
(b) Explain Carbon fibers.
04
(c) Explain in detail advantage and disadvantage of composite material.
07
Q.2 (a) What is the role of Reinforcement and Matrix in composite material?
03
(b) Describe the basic assumption of the analysis of laminated composite.
04
(c) Discuss in details anti symmetric laminates.
07
Q.3 (a) What is the total no. of independent elastic constant of General anisotropic
03
material, Monoclinic material and Isotropic material? [Only Value]
(b) Describe the following terms with the sketch.(Any two)
04
1. Metal Matrix Composite (MMC) 2. Laminate. 3. Particle reinforced.
(c) Derive equations for volume and weight fractions
07
Q4. (a) For an orthotropic lamina, engineering constant along he principal material axes
03
are E1=150 Gpa, E2=20 Gpa, G12 = 5 Gpa, v12=0.2.
(b) What do you understand by the mechanical behavior of composite materials?
04
(c) Derive equations for longitudinal strength and stiffness.
07
Q.5 (a) What is the need of Fillers? Explain in details
03
(b) Write a short note on Poisson's Mismatch effect.
04
(c) Derive the equation for the stress - strain relationship in composite laminate with
07
equilibrium equation.
Q.6 (a) Explain about prepegs.
03
(b) Describe the Relation between stiffness coefficient Cij and compliance
04
component Sij.
(c) Identify the type of laminate given below:
07
1. [90|0]
2. [45|0|-45]
3. ['?30]
4. [0|90|0|90]
5. [20|45|-20|-45]
1
Q.7 (a) Name the methods to find properties of FRCs on the basis of its constituent
03
elements.
(b) Write down the significance of fillers and additives in composite materials in
04
detail.
(c) Derive In-Plane Sher modulus and transverse ratio.
07
Q.8 (a) Write a note on Aramid fibers.
03
(b) The E-glass fiber in a polyester resin is 35% by weight.
04
Given f = 2.50 gm/ml and m = 1 gm/ml.
Calculate Vf and c for the lamina.
(c) Describe the stress-Strain relation of a monoclinic material.
07
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This post was last modified on 04 March 2021