Introduction to CMC

Ceramic matrix composites, also known as fibre reinforced ceramics are becoming popular in material selection since 1980s. High modulus of elasticity of ceramics combined with superior toughness and strength contributed by the fibres have made CMCs a viable option in material selection.

Due to the brittleness and presence of flaws, ceramic materials are susceptible to damage due to shock and impact loading. It is observed that the reinforcement of fibre can increase the fracture energy by order of magnitude resulting in high fracture toughness (K_IC from 2-3 to 30-40 Mpa- m^1/2) . The table below shows some of the commonly used CMCs and their mechanical properties.