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09PD71 PROJECT WORK – PHASE I

Analysis of mechanical properties of rubberized cork composite sandwich material

Presented byB.Rajeshkumar

11MJ36M.E PDC II year

Project GuideMr.M.R.Pratheesh Kumar

(Assistant Professor (Sr.Gr))Department of Production Engineering

PSG College of Technology

Table of contents

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1. Progress of the work 2

a. Specification of the product 2

b. Literature survey 2

2. Natural fiber 2

3. Jute as the reinforcement 2

4. Advantages 3

5. Disadvantages 3

6. Curing agents 4

7. Preparation for testing 4

8. Mechanical properties of material 5

9. Model 6

10. Analysis using LAMINATOR 7

11. Results 8

12. Expected future work 13

13. Mechanical testing to be performed 13

14. References 14

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Progress of the work:

Specification of the product

The characterization of composite material sandwich is jute/epoxy/rubberized cork.

The laminate constituting of jute/epoxy as the skin.

Literature Survey

Study of mechanical properties of composite sandwich cork core and skins jute / epoxy.

UNIVERSITY M'HAMED BOUGARA – BOUMERDES

Natural fibers

Vegetable fibers are an interesting alternative to fiberglass because their recyclability. By

their physical and chemical composition, natural fibers have highly variable mechanical

properties thus giving each fiber type well use specific. Fibers have many advantages as

reinforcement composite materials. However, some drawbacks can be a hindrance at the

industrial development.

Jute as the reinforcement:

Among the natural fibers we have just seen, and for reasons of availability Algeria

through import, we focus on the use of jute fiber in manufacture of sandwich panels can

be used in the field of construction and transport. Our goal is to develop in less

industrialized countries, a resource local natural is jute, and thus develop a new material

by means of technology available, taking into account the impacts on the environment.

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Advantages

1. Low cost.

2. Biodegradability.

3. Neutral CO2 emissions.

4. No skin irritation when manipulation of the fibers.

5. No residue after incineration.

6. Renewable resource.

7. Requires little energy to be produced.

8. Significant strength and stiffness.

9. Good thermal insulation.

Disadvantages

1. Water absorption.

2. Poor dimensional stability.

3. Poor performance in aging.

4. Low thermal resistance (200 to 230 ° C max).

5. Anisotropic fiber.

6. Quality variation by location growth, weather ...

7. Non-abrasive tooling.

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Curing agent:

WHY?

A variety of curing agents will react with epoxy resins to provide cross linked adhesives.

There are six primary classifications of curing agents that are generally used. These

curing agents are often divided into low or room temperature curing types and elevated

temperature curing types. The choice of a particular curing agent or catalyst depends on

the processing requirements (e.g., viscosity, pot life, application method, curing

temperature, rate of reactivity, mix ratio) and the end-use requirements (e.g., thermal and

chemical resistance, shear strength, toughness) of the cured adhesive. The curing agents

along with the epoxy resin will determine the type of chemical bonds and the degree of

cross linking that will occur.

Curing is a term that refers to the toughening or hardening of a polymer material by

cross-linking of polymer chains, brought about by chemical additives, ultraviolet

radiation, electron beam or heat. The epoxy resin is mixed with a curing agent RAC 9904

which has a melting point at 60-65oc. The curing agent is mixed with the resin in the ratio

of 100:15.

Preparation for testing:

Rubberized cork plates are cut to the dimensions 300 x 300 mm according to the standard

NF T 57-105 equivalent to ASTM. The reinforcement consists of jute fabric is cut in the

direction of cutting to size of 300 x 300 mm. Two fabric plies arranged at 0 ° constitute

the reinforcement of the skin. The composite is prepared using hand lay-up technique.

The resin is applied using paddle rollers for the even spread through out the sheet.

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Once the sandwich is prepared the composite is left for 7 days at room temperature or at

50 ° C for 15 hours or at 80 ° C for 8 hours.

MECHANICAL PROPERTIES OF THE MATERIALS:

1. MARTIX (Rubberized cork)

2. FIBER (Jute) VOLUME FRACTION

3. RESIN (Epoxy) Vf = 0.7/ Vm = 0.3

PROPERTIES MATRIX FIBER EPOXY

Density kg/m3 140 1440-1460 1300

Tensile strength (MPa) 0.16 453-550 80

Young’s modulus (GPa) 51 300-780 2-20

Shear strength (MPa) 0.85 124

Shear modulus (MPa) 5.9 7 4400

Poisson’s ratio 0.37 0.3 0.4

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With the available properties the theoretical strength of the composite is calculated using

the software THE LAMINATOR Version 3.7

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EXPECTED DEVELOPMENT AND FUTURE WORK:

The theoretical stress and strain for the properties of matrix, fiber and resin are calculated.

The values will be calculated experimentally and compared. Since it is a new material, a comparative study will be made with the existing

material (Agglomerated cork reinforced by jute).

MECHANICAL TESTING:

Testing is required to evaluate the mechanical properties of the reinforcement, matrix

material, lamina and laminate.

1. Tensile testing

A small piece of the composite is fixed on the slots at 2 ends in a testing machine and the

load is applied at the constant rate.

2. Compressive testing

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Reference:

1. Study of mechanical properties of composite sandwich cork core and skins jute /

epoxy.

UNIVERSITY M'HAMED BOUGARA – BOUMERDES

2. Composite materials – Production, Properties, Testing andApplications

K. DRINIVASAN

3. Mechanics of composite material