Fabrication and tensile property analysis of a composite laminate with different diameter holes

IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
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Volume: 04 Issue: 07 | July-2015, Available @ http://www.ijret.org 287
FABRICATION AND TENSILE PROPERTY ANALYSIS OF A
COMPOSITE LAMINATE WITH DIFFERENT DIAMETER HOLES
M.Ravindra Gandhi1
, P.V.R.Girish Kumar2
, P.Ashok Reddy3
, B.Siva Prasad4
1
Assistant professor, Mechanical Engineering, Geethanjali college of engineering and Technology, Telangana, India
2
Assistant professor, Mechanical Engineering, Geethanjali college of engineering and Technology, Telangana, India
3
Assistant Professor, Mechanical Engineering, Vignan Institute of Technology and science, Telangana, India
4
Assistant Professor, Mechancial Engineering, Vignan Institute of Technology and science, Telangana, India
Abstract
Composites play a vital role in aerospace, land transportation and consumer goods due to their high specific strength and
stiffness leading to reduction in the mass of moving objects. Some of the important aerospace hardware such as rocket motor
casing makes extensive use of carbon fiber reinforced polymer(CFRP). In this present investigation E-Glass epoxy laminates
were used. The tensile properties for various Diameter holes were determined and compared with the actual strength of the
material without any hole. Results indicate that because of the increase in diameter of the hole the tensile strength of the material
is decreasing.
Keywords: CFRP, E-Glass, Epoxy, Tensile strength.
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1. INTRODUCTION
In the field of mechanical & aerospace composites are
widely used because of the high specific strength and low
density of composites. Composites are widely used because
of their tailorability of properties to the required direction or
strength. In the field of aerospace, for the sake of pressure
vessels like rocket motor casings composites will result in
high strength as well as low weight. Weight is a major factor
of any flying object whenever we discuss about trade off
ratios. So for the sake of reduced weight and increased FOS
composites are emerging materials now days.
Mechanical performance of fibrous composites will depends
on the following aspects
1. Surface treatment of the fiber
2. Percemtage elongation of the fiber & matrix
3. Chemistry of the resin dictated by functionality,
addition of toughening agent, curing agents and
curing conditions.
2. LAMINATE PREPARATION
E-glass/epoxy resin laminates were prepared by drum
winding process. E-glass fibres are passed through a resin
bath containing epoxy resin mixed with 10%by weight of
hardener HY 5200.The traction for pulling resin wetted
fibres which pass through a pay-out eye attached to the
longitudinal slide (tool post), is provided by rotating
cylindrical mandrel. The resin bath is equipped with in-built
servo controlled heating system and the temperature of resin
mix is maintained at 400
c, in order to bring the resin
viscosity to around 1000-1500cpa.This enables the volume
fraction of fibres to be at around 60%.The cylindrical drum
on which fibres are deposited is rotated at a low speed of
15rpm. Prior to winding, it is covered with a thick HDPE
film without any wrinkles what so ever. After the winding is
completed, the mandrel kept under rotation for about an
hour to ensure that there is no resin collection at the bottom
due to gravity. The punch plate is then assemble to it and
clamped with bolts & nuts. The clamping bolts are torqued
to a value of 30N-m with the help of a torque wrench. The
assembly is placed in a curing oven and the composite was
cured. as per the following general cure cycle.
Variations were made to suit the resin systems as
recommended by the manufacturer.
Room temperature to 70oC - 3omin
Hold at 70oC – 120 min
Ramp to 150oC – 30min
Hold at 150oC – 240min
Thereafter remove the composite laminate from mouldand
trim the edges.
To prepare the laminate, the following process
parameters were used
SNo Parameter/Material Details
1 Resin/Hardener LY-556/HY 5200
3 Tool Cylindrical/Rectangular
Mandrel
4 Process a)Drum winding
5 Band width 3.0mm
6 Fibre Tension 0.9kg
7 Distance between
Resin bath and
mandrel
1.66m
8 Number of processes 1

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9 Mandrel RPM 15 RPM
10 Resin temperature 45o
C
11 Volume fraction 60%
Specimen Preparation: Specimens were prepared from
composite laminated plates according to ASTM
specifications
ASTM Specifications: Specimens were prepared from
composite laminated plates; the manufacturing process is
described under the heading “material preparation”. The
specimens conform to the requirements lead down in the
relevant ASTM specifications listed below
S.No Type of
test
Relevant
ASTM
Number
of
specimens
Specimen
size(mm)
1 UD-
Tensile
D-3039 5 250x15x1.0
2 Transverse
tensile
D-3039 5 175x25x2.0
3 Flexural D-790 5 50X25X1.6
4 ILSS D-2344 5 24X12X6.0
5 In plane
shear
D-3518 5 300x25x3.0
Tensile test specimen
Tensile Properties without a hole
S.No Geometry
(mm)
BreakingLoad(KN) σ(MPa)
1. 300 x 27.27 x
3.8
59.6 575.14
2. 300 x 27.8 x
3.9
58.5 539.56
3. 300 x 27.8 x
5.1
80.5 567.78
Graph 1
Tensile Properties with 3mm centre hole:
S.No Geometry
(mm)
1. 300 x 26.5 x
3.8
40.5 402.18
2. 300 x 28.5 x
4.0
47.0 412.28
3. 300 x 26.6 x
5.15
61.46 448.64
Graph 2
Tensile Properties with 3mm offset hole
S.No Geometry
(mm)
1. 300 x 26.4 x
3.8
35.0 348.88
2. 300 x 28.0 x
4.0
46.0 410.71
3. 300 x 26.0 x
5.1
61.4 463.04

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Graph 3
Tensile Properties with 5mm centrehole:
S.No Geometry
(mm)
1. 300 x 26.0 x
3.68
34.5 360.57
2. 300 x 28.0 x
3.85
39.5 366.42
3. 300 x 26.75 x
5.15
58.92 427.69
Graph 4
Tensile Properties with 5mm offset hole:
S.No Geometry
(mm)
1. 300 x 26.25 x
3.8
33.5 335.84
2. 300 x 27.32 x
3.8
34.0 327.5
3. 300 x 26.75 x
5.1
56.24 412.24
Graph 5
Tensile Properties with 7mm centre hole:
S.No Geometry
(mm)
1. 300 x 27.0 x
3.8
32.5 316.76
2. 300 x 27.8 x
4.0
33.5 301.26
3. 300 x 26.2 x
5.1
47.22 353.39
Graph 6
Tensile Properties with 7mm offset hole:
S.No Geometry
(mm)
1. 300 x 26.3 x
3.85
29.4 290.35
2. 300 x 27.0 x
4.0
30.82 285.37
3. 300 x 27.2 x
5.1
46.7 336.65

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Graph 7
3. RESULTS & CONCLUSION
1. Tensile strength of samples without hole=560.82 MPa
2. Tensile strength of samples with 3mm hole at
center=421.03 MPa
3. Tensile strength of samples with 3mm hole at 5mm
offset from the center=407.54 MPa
4. Average Tensile strength of samples with 5mm hole at
center=384.89 MPa
5mm offset from the center=358.52 MPa
center=323.80 MPa.
The Tensile strength of the specimen is inversely
proportional to the Diameter of the hole.The Tensile
strength is lower for specimen having hole at offset from the
centre compared to specimen with hole at the centre.
REFERENCES
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hybrid carbon fibers reinforced polymer composites,
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BIOGRAPHIES
M.Ravindra Gandhi, Assistant
professor, Mechanical Engineering,
Geethanjali college of engineering and
Technology, Telangan, India
P.V.R.Girish Kumar, Assistant
professor, Mechanical Engineering,
Geethanjali college of engineering and
Technology, Telangan, India
P.Ashok Reddy, Assistant professor,
Mechanical Engineering, Vignan Institute
of Techonlogy & Science, Telangan,
India
B.Siva Prasad, Assistant professor,
Mechanical Engineering, Vignan Institute
of Techonlogy & Science, Telangan, India

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