Projects

NATURAL FIBER HYBRID COMPOSITES

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Project Owner : 18sandhya
Created Date : Tue, 31/01/2012 - 12:17
Project Description :

Recently natural fibers have been receiving considerable attention as substitutes for synthetic fiber reinforcements such

as glass in plastics due to their low cost, low density, acceptable specific strength, good thermal insulation properties,

reduced tool wear, reduced thermal and respiratory irritation and renewable resources. The development of natural fiber

usage in India has now reached an appreciable stage. The aim of this work is to develop a Natural Fiber Reinforced

Hybrid Composite material with optimum properties so that it can replace the existing Synthetic Fiber Reinforced Hybrid

Composite material for a suitable application. The concept of hybridization gives flexibility to the design engineer to tailor

the material properties according to the requirements, which is one of the major advantages of the composites. Hybrid

composites have long taken the attention of many researchers as a way to enhance mechanical properties of

composites. However, hybrid composites using natural fibers are less studied. And in such studies, the hybrid

composite often consists of one natural fiber and one non-natural fiber. The non-natural fiber is nanoclay, the study on

nanoclay hybrid natural fiber is studied very rare.

 

In this work, lemon grass and nanoclay were used as the reinforcing material, and also test its tensile, flexural, and

impact strength and tensile, flexural, and impact modulus.

Lemongrass is native to India and tropical Asia. It is widely used as a herb in Asian cuisine. It has a subtle citrus flavor

and can be dried and powdered, or used fresh. Lemongrass is commonly used in teas, soups and curries. It is also

suitable for poultry, fish, beef, and seafood. It is often used as a tea in African countries such as Togo and the

Democratic Republic of the Congo and Latin American countries such as Mexico.

Lemongrass oil is used as a pesticide and a preservative.Research shows that lemongrass oil has anti-fungal

properties. Lemon Grass Oil, is put on the ancient palm-leaf manuscripts found in India as a preservative. It is used at

The lemon grass oil also injects natural fluidity into the brittle palm leaves and the hydrobhobic nature nature of the oil

keeps the manuscripts dry so that the text is not lost to decay due to humidity.

Lemon grass belongs to Cymbopogon genus. Cymbopogon (lemongrass) is a genus of about 55 species of grasses,

of which the type species is Cymbopogon citratus native to warm temperate and tropical regions of the world.

Hand layup technique was used to manufacture the composites. It is the oldest, simplest and most commonly used

method for the manufacture of both small and large reinforced products. It is used in applications where production

volume is low and other forms of production would be prohibitive because of costs or size equipment. Methyl Ethyl

Ketone Peroxide, Cobalt Naphthalene were used as coupling agent and accelerator respectively. Volume fraction of the

fibers was calculated using rule of mixtures and varied between 5% and 30% and the relative volume fraction was

maintained as 1:1. A roller was used in order to maintain the homogeneity of the fibers within the composite. Curing

time for the composite sheet was about 7 hours to 9 hours. Initially 10% and 20% volume fraction of composite sheets

were manufactured and tested for its mechanical properties. An electronic Tensometer was used to determine the

tensile strength and tensile modulus by conducting tensile test in it. Cutting of five Specimens according to the ASTM

standard ASTM D 638 – 03 and tested. Curves were plotted for load against displacement and stress against the strain

and tensile strength and tensile modulus were determined using the results obtained from Tensometer. For 10%

volume fraction of the fibers the average maximum tensile strength of the specimen was found to be 22.31 MPa and the

average maximum tensile modulus was found to be 453.78 GPa. Average peak load and average maximum

displacement was found to be 535.5N and 2.33mm respectively. Similarly for 20% volume fraction the average

maximum tensile strength was found to be 36.45MPa and the average maximum tensile modulus was 428.34GPa.

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