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Composites are materials made from two or more constituent materials that remain separate and distinct within the new material. They have several advantageous properties like high strength and stiffness. Composites consist of a matrix that embeds and protects a reinforcement. The matrix maintains the position of the reinforcement and prevents crack propagation, while the reinforcement imparts special properties. Composites can be classified as particle reinforced, structural, or fiber reinforced depending on the type and geometry of the reinforcement. Particle reinforced composites are the cheapest and come in large or dispersion-strengthened particles in a matrix.
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- 2. Definition •Are formed bythe combination the materials • Having different physical and chemical properties •Constituents remain separate and distinct. •They do not dissolve or blend into each other. •Composites are materials that satisfy the technology •They have several advantageous features: High specific strength High specific modulus Other desired properties
- 3. CONSTITUENTS OF COMPOSITES Composites consists minimum of two parts - Bulk or a continuous phase (matrix.) -And dispersed phase (reinforcement.) MATRIX: 1. The individual reinforcing elements protecting 2. It maintains their relative positions. 3. Prevents the propagation of brittle cracks REINFORCEMENT: It imparts special electrical and mechanical properties
- 4. CLASSIFICATION OF COMPOSITES 1.Particle Reinforcement composites. 2. Structural Composites. 3. Fiber Reinforcement composites. i. Continuous fibers with unidirectional aligned. ii. Discontinuous fiber and unidirectional aligned. iii. Discontinuous fiber and randomly oriented.
- 5. PARTICLE REINFORCED COMPOSITE Theseare the cheapest and used. They fall in two categories (size) 1. Large-Particle Composites -Consist of a high volume fraction of large sized hard particles embedded in a relatively soft matrix. 2. Dispersion-Strengthened Composites -Contains extremely small sized particles dispersed -At low concentration which increases the matrix attractions -At the atomic level there by enhancing the strength
- 6. PARTICLE REINFORCED COMPOSITE Theseare the cheapest and used. They fall in two categories (size) 1. Large-Particle Composites -Consist of a high volume fraction of large sized hard particles embedded in a relatively soft matrix. 2. Dispersion-Strengthened Composites -Contains extremely small sized particles dispersed -At low concentration which increases the matrix attractions -At the atomic level there by enhancing the strength