Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 7th Sem New 2170107 Mechanics Of Composite Materials Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? VII (New) EXAMINATION ? WINTER 2019
Subject Code: 2170107 Date: 28/11/2019
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 the significance of fibre and matrix in composite
material?
03
(b) What is the limitation of a unidirectional lamina? How it can be
overcome by laminate? Explain with neat sketch.
04
(c) Carry out the comparison of composite material with metals in
detail.
07
Q.2 (a) Give the classification of composite material. 03
(b) Define composite material. Explain basic constituent materials
of composites
04
(c) Discuss the applications of composite materials in Aerospace
engineering field.
07
OR
(c) Identify the types of laminate given below.
1. [ 0 /30 /60 ]
??
2. [ 0 /90
2
/0 /90 ]
3. [ ? 40 /40 / ? 40 /40 ]
4. [ 45 /60 /? 60 /? 45 ]
5. [ 30 /40 /? 30 /30 /? 30 /? 40 ]
6. [ 0 /? 60 ]
7. [ 0 /90 ]
??
07
Q.3 (a) Sketch the variation of stress and strain through a laminate. 03
(b) Derive Inplane Shear modulus with neat sketch. 04
(c) Write a short note on [A], [B] and [D] matrices. 07
OR
Q.3 (a) What is plane stress assumption? 03
(b) Determine the transverse modulus of a unidirectional lamina
with neat sketch.
04
(c) Derive Strain-Displacement relationship of a laminate using a
neat sketch.
07
Q.4 (a) Write down the difference between micromechanics and
macromechanics.
03
(b) Write a short note on Poisson?s ratio. 04
(c) Write down the advantages and disadvantages of composite
material.
07
OR
Q.4 (a) What is Prepeg? Explain. 03
(b) Write down the significance of fillers and additives in
composite materials in detail.
04
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? VII (New) EXAMINATION ? WINTER 2019
Subject Code: 2170107 Date: 28/11/2019
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 the significance of fibre and matrix in composite
material?
03
(b) What is the limitation of a unidirectional lamina? How it can be
overcome by laminate? Explain with neat sketch.
04
(c) Carry out the comparison of composite material with metals in
detail.
07
Q.2 (a) Give the classification of composite material. 03
(b) Define composite material. Explain basic constituent materials
of composites
04
(c) Discuss the applications of composite materials in Aerospace
engineering field.
07
OR
(c) Identify the types of laminate given below.
1. [ 0 /30 /60 ]
??
2. [ 0 /90
2
/0 /90 ]
3. [ ? 40 /40 / ? 40 /40 ]
4. [ 45 /60 /? 60 /? 45 ]
5. [ 30 /40 /? 30 /30 /? 30 /? 40 ]
6. [ 0 /? 60 ]
7. [ 0 /90 ]
??
07
Q.3 (a) Sketch the variation of stress and strain through a laminate. 03
(b) Derive Inplane Shear modulus with neat sketch. 04
(c) Write a short note on [A], [B] and [D] matrices. 07
OR
Q.3 (a) What is plane stress assumption? 03
(b) Determine the transverse modulus of a unidirectional lamina
with neat sketch.
04
(c) Derive Strain-Displacement relationship of a laminate using a
neat sketch.
07
Q.4 (a) Write down the difference between micromechanics and
macromechanics.
03
(b) Write a short note on Poisson?s ratio. 04
(c) Write down the advantages and disadvantages of composite
material.
07
OR
Q.4 (a) What is Prepeg? Explain. 03
(b) Write down the significance of fillers and additives in
composite materials in detail.
04
2
(c) How the independent elastic constants have been reduced from
81 to 2 for different materials. Explain in detail with the use of
stress-strain relations and neat sketches.
07
Q.5 (a) What is particulate composites? 03
(b) Write a short note on symmetric laminate. 04
(c) Derive the equations for volume fractions, weight fractions and
density of composite material.
07
OR
Q.5 (a) What do you mean by balanced laminate 03
(b) Write a short note on anti-symmetric laminate. 04
(c) Discuss the application of composite materials in Automotive
and Marine fields.
07
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This post was last modified on 20 February 2020