Presenter

Murali Krishna Eragani

Senior Under Graduate Student

Dept. of Mechanical Engineering

JNTUH College of Engg. Hyderabad

COMPOSITE MATERIALS

Outline of the Presentation

What are Composites?

Classification of Composites

Why Composites?

Applications of Composites

Case Study on Composites

Strength Analysis

References

What are Composites?

Two or more chemically distinct materials which when combined have

improved properties over the individual materials

Constituent Materials

Matrix surrounds and supports the reinforcement materials by

maintaining their relative positions

Reinforcements impart special physical and mechanical properties to

enhance the matrix properties

Classification of Composites

Particle – Reinforced Composites

Concrete:

Coarse rock or gravel is embedded in a

matrix of cement

Gravels provides stiffness and strength while

cement acts as the binder to hold the structure

together

Fiber – Reinforced Composites

Wood – Cellulose fibers in lignin and hemicellulose matrix

Carbon Fiber Reinforced Plastic (CFRP)

Glass Fiber Reinforced Plastic (GFRP)

Reinforcement: fibers

Glass

Carbon

Boron

Matrix materials

Polymers

Metals

Ceramics

CFRP

GFRP

Structural Composites

Sandwich Panels Low density, honeycomb core

Benefit: light weight, large bending stiffness

Stacked and Bonded Fiber – Reinforced Sheets Stacking sequence: e.g., 0º/90º or 0/45/90º

Benefit: balanced, in-plane stiffness

Why Composites?

Excellent Strength – to Weight Ratio

Superior Mechanical Properties

Reduced Weight of the Final Components

Resistance to Fatigue

Resistance to Corossion

Design Flexibility

Lower Investment in Setting Up of Composites Manufacturing

Industry

Applications of Composites

Strength – Weight Graph for Various Materials

Carbon Fiber Aluminium 304 Stainless Steel Glass Fiber

Strength

Weight

Case Study on Composites

Case Study on Composites (Contd.)

20% more fuel efficiency and 35,000 lbs. lighter

Composites in the First Smart Phone of India

Xiaomi India CEO Manu Jain with Andhra Pradesh CM Chandrababu Naidu at Redmi 2 Prime launch Xiaomi Redmi 2 Prime

The Protective Casing of India’s First Manufactured Smart Phone, Xiaomi Redmi 2 Prime is made

of Carbon Fiber

Strength Analysis of Composites

Stiffness Matrix

Anisotopic Mechanical Properties

FEA of Aircraft Wing

References

[1] Composite Materials – Callister

[2] Hexcel Corporation –Aerostrategy

[3]The Boeing Company and Airbus

[4] Composite Materials – NPTEL

[5] Engineering Comosite Materials – Brayn Harris, Institute of Materials,

London

[6] Indian Express –The English Daily

THANK YOU