A Composite material is a combination of two or more macro constituents that differ in shape and chemical composition and which are insoluble in each other. The history of composite materials dates back to early 20th century. In 1940, fiber glass was first used to reinforce epoxy
Characterization of Mechanical Behavior of New Hybrid Fiber Reinforced Composite Sheets: An Experimental approach
1. International Conference On Emerging Trends In
Engineering, Sciences & Management -2018
Characterization of Mechanical Behavior of New
Hybrid Fiber Reinforced Composite Sheets: An
Experimental approach
By
Dr.K. Mallikarjuna
Professor, Dept of Mech. Engineering,
G. Pullaiah college of Engineering and Technology,
Kurnool, AP, India
2. INTRODUCTION:
“A Composite material is a combination of two or more macro
constituents that differ in shape and chemical composition
and which are insoluble in each other. The history of
composite materials dates back to early 20th century. In 1940,
fiber glass was first used to reinforce epoxy.”
3. objectives
To gain a better understanding of tensile properties of epoxy
resin composites reinforced with different compositions of
coconut sheath, jute fiber with graphite powder.
To understand the manufacturing processes of reinforcement
fibers and matrices for composites
To investigate effect of fiber orientation & thickness of
laminates in determining property data for material specifications.
4. TYPES OF FIBERS
Rayon artificial silk
Vinyon
Nylon
carbon
Vinalon
Aramids - known as Nomex, Kevlar and Twaron.
Modal
Natural fiber (jute)
Bi-woven
Coconut sheet
Jute
Graphite powder
6. PROPERTIES OF MATERIALS USED
Bi-woven fiber
high fiber length to width ratio
Flexibility(the quality of bending without breaking)
Uniformity(the quality of being uniform)
Electrical conductivity
High stiffness and less in weight
Epoxy resin
Absolutely non porous(not allowing air or liquid to pass through it)
Tough and resistance to impact
Heat and chemical resistance
Excellent adhesion
7. Work station & Mold Preparation
Work station preparation
An initial preparation of all the materials and tools
that are going to be used is a fundamental standard
procedure when working with composites.
Mold preparation
Before starting with the lay up process an
adequate mold preparation must be done. Mainly, this
preparation consists of cleaning the mold and applying a
release agent on the surface of it to avoid the resin to stick
12. Tensile Strength Test
For the tensile test, the specimen
size was 150 x 13 x 3 mm. Tensile
strength was tested in Instron
machine. The specimen with
desired dimension was fixed in
the grips of the Instron machine .
The experimental set up for
tensile test is shown in Figure.
15. FLEXURAL STRENGTH TEST
The flexural strength is stress at failure
in bending. ...Flexural strength, also
known as modulus of rupture, or
bend strength, or transverse
rupture strength is a material
property, defined as the stress in a
material just before it yields in
a flexure test.
For the flexural test, the specimen size
was 150 x 15 x 3mm. flexural strength
was tested in Instron machine.
16. Specimen label Maximum load (KN) Maximum stress (MPa) Flex modulus (mpa)
1 biwoven5g+jute15g 0.33
180.81 14449.20
mean 0.33
180.81 14449.20
19. ADVANTAGES:
A higher performance for a given weight leads to fuel
savings. Excellent strength-to weight and stiffness-to-
weight ratios can be achieved by composite materials.
It is easier to achieve smooth aerodynamic profiles for
drag reduction.
Production cost is reduced
Composites offers excellent resistance to corrosion.
Good electrical component .
20. Disadvantages:
Composites are more brittle than wrought metals and
thus are more easily damaged.
Hot curing is necessary in many cases, requiring special
equipment
Repair at the original cure temperature requires tooling
and pressure
21. CONCLUSION
Based on above observations:
Maximum tensile strength is 76.68MPa.
Maximum flexural strength is180 .81MPa.
Finally, it is concluded that Specimen 1 gives better strength for
both tensile and Flexural when compared with specimen 2
SPECIME
N.NO
SPECIMEN IN(gm) TENSILE TEST
VALUES (MPa)
FLUXURAL
STRENGTH
(MPa)
1 BI-WOVEN(5)+JUTE(15) 76.68 180.81
2 BI- WOVEN (15)+JUTE(5) 47.69 119.6
