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Fri group 2 carbon Fiber Composites

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Rachel Flores

on 2 May 2015

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Transcript of Fri group 2 carbon Fiber Composites

Comparing the Effects of Weave Type and Epoxy on Carbon Fiber Composite Tensile and Bend Strength
To make carbon fiber/epoxy composites out of different carbon types of fiber weaves and epoxies
To test the bend and tensile strengths of the different composites
Compare the effects of two different epoxies ( general, reinforced with Kevlar and graphite)
Compare the effects of two different fiber weaves (tight, loose)
Background Information: Carbon Fiber
Materials & Equipment
Results and Discussion
Tensile Test
Tight weave with general epoxy strongest
Loose weave with Kevlar epoxy weakest
Bend Test
Loose weave was weakest for both general and Kevlar epoxies
Didn't offer enough resistance to get good readings
Tight weave with Kevlar epoxy was strongest

Fabric and epoxy, dispersed phase and matrix phase
24 April 2015
University of the Pacific

Robert Carter
Rachel Flores
Scharlyce Powell
David Ramirez

Thank you everyone who helped our group succeed with our projects.
Dr. Roehling
Andrew Brazil
MTS tensile and bend test machine
Titanium alloy
Bidirectional, tight weave carbon fiber fabric
Bidirectional, loose weave carbon fiber fabric
General epoxy
Kevlar and graphite reinforced epoxy

Cut 4 "I" shaped and 4 rectangular samples for each type of weave
Coated one of each shape in the general epoxy and the remaining shapes in the Kevlar epoxy
Allowed 1 week for curing
"I" shaped samples were then placed in the MTS for tensile test
Rectangular samples were then placed in the MTS for bend test
One of the lightest and strongest material in existence
Graphite polymer arranged in hexagonal rings
An epoxy is used to form a composite and add strength by distributing load throughout entire fabric
Different types of epoxies provide different physical characteristics
The composite is very brittle, but strong.
Light with high elastic modulus, tensile strength, and yield strength
Weave type has almost no effect on strength, mostly effects flexibility and aesthetics
Background Information
Bend tests help determine ductility of the specimen
To determine tensile strength, tensile test can be done on the composite
A stress-strain curve can be created
Physical Hazards
Blast Shield
Flying shards
Sharp Metals
Safety Analysis
Tensile Test Results
Chemical Hazards
Mask for fumes
Epoxy fume hood
Respiratory Harm
Safety Analysis
Bend Test Results
TAP Plastics-
Carbon fiber background -
Nike Superfly picture
- https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcRlhj5lVqniq-YmkjjxJx3Vpm6q2yQG3d2jN4j_NAiXzlx72GbQSQ
Badminton racquet
- http://fleet.webi.my/files/2011/04/fleet_grand_woven_1000_ii_002.jpg
Lamborghini picture
- https://encrypted-tbn0.gstatic.com/imagesq=tbn:ANd9GcRHStnFIVk17IJ5vDSQOZhU0BCCSxZ-62JndE6QmHyTqtP3x5ZcA
Carbon fiber picture
- http://harrisonsteele.com/wp-content/uploads/2012/03/carbon-fiber-8.jpg
Carbon fiber background -
Carbon fiber background -
Bend Test Background
- http://www.welding-advisers.com/Bend-testing.html

Background information
= Deflection, used to calculate elastic modulus
P = Applied load
L = Distance between support rollers (span)
Objective: to determine the strongest carbon fiber/epoxy matrix by testing tight and loose weave carbon fiber samples with two different epoxies: one reinforced with Kevlar and graphite, and a general epoxy.

Objectives were met through:
Tensile and bend tests of different epoxies
Composites with general epoxy as dispersed phase had greater tensile strength
Composites with tight weave as matrix phase had greater bend strength

These two tests helped us understand the effects of property averaging due to composite characteristics. This information can be used to design projects which require properties found in this experiment, including high elastic modulus and strength.
= Bending stress
M = Bending moment
I = Moment of inertia
y = Distance from neutral axis
M = Bending moment
P = Applied load
L = Span
=Tensile stress
F= Force applied
A= Cross-sectional area of the material
=Tensile strain
dL= Change in length of the sample
Lo= The initial sample length
From left to right:
Tight weave + general epoxy; Loose weave + general epoxy; Tight weave + Kevlar&graphite epoxy; Loose weave + Kevlar&graphite epoxy
Loose weave was not very resistant to bending, spread of data can be described as being in the noise.
Tight weave in general epoxy had the greatest tensile strength
Nike Mercurial Superfly soccer cleats
Fleet Racket Woven 1000 II
2014 Lamborghini Veneno
Carbon fiber sample from Harrison Steel (co)
Full transcript