Comprehensive Notes on Composite Materials

Module: Composite Materials

Definition of Composite Materials

  • What are Composite Materials?

    • A composite is a material made from a combination of multiple constituents that enhance its properties.

Historical Overview of Composite Materials

  • Human Body:

    • Muscles and bones as the oldest natural composites.

  • Early Applications:

    • 1300 B.C.: Egyptians and Mesopotamians used straw bricks.

    • Composite bows around 3000 BC, made from wood, horn, sinew, leather, bamboo, and antler.

  • Industrial Advancements:

    • 1930s: Introduction of glass fibre and the start of the Fibre Reinforced Polymer (FRP) industry.

    • 1961: Patent of the first carbon fibre, which became commercially available.

Categories of Composites

  1. Particle Reinforced Composites

    • Types: Metals, Ceramics, Polymers

    • Form: Size, Shape

  2. Fibre Reinforced Composites

    • Types: Continuous or Short Fibres.

    • Orientation: Random or Aligned.

  3. Laminated Materials

  4. Sandwich Panels

Advantages of Composite Structures

  • Increased Stiffness

  • Increased Strength

  • Reduced Density

  • Increased Toughness

  • High Temperature Resistance

  • Improved Corrosion Resistance

  • Modified Electrical and Thermal Behaviours

Applications of Composites

  • Aerospace:

    • Extensive use in military and civil aircraft due to the lightweight and strong materials.

    • Example: Boeing 787 utilizes composites for significant parts.

  • Automotive:

    • Carbon fibre composites used for high strength and rigidity.

    • Benefits of ease of processing thermoplastic composites.

  • Construction:

    • Glass fibre reinforced polyester used for durable, lightweight building materials.

  • Marine:

    • Composites used in luxury yachts and boats for their strength and water resistance.

Case Studies in Composites

  • Wind Turbines:

    • Glass fibre composites for rotor blades ensure they can withstand varying wind conditions and are lightweight.

  • Medicinal Applications:

    • Carbon fibre used for needles that allow MRI imaging during surgical procedures.

  • Tennis Balls:

    • Incorporation of vermiculite nanoparticles for improved performance.

Conclusion

  • Understanding of composites is crucial across various sectors due to their versatility and advantageous properties. The study of composite materials paves the way for advancements in engineering and structural applications.