Fatigue in Ceramic Matrix CompositesFunded under: FP5
Scientists from three corners of the globe have collaborated over the Internet to research the possibilities of using modified ceramics to replace metals in some technologies. New techniques allow the microstructures of ceramics to be modified to increase their resistance to cracking, making them useful for high-temperature applications where metals lose some of their effectiveness. Since these ceramics are not as brittle as traditional ones, they show mechanical fatigue effects which must be evaluated before they can be put into use. The responses of manufactured ceramics or "ceramic matrix composites" to cyclic variations of mechanical stress were investigated by the research group. They discovered that most ceramics exhibit linear deformation under low stresses, becoming non-linear under intermediate stresses and then showing a second linear region under large stresses before breaking. Researchers tested hypotheses about the mechanisms by which microcracks in the substance become macrocracks, and the effect of stress on both whisker and fibre reinforced ceramics. When the properties of these substances are fully understood, ceramic matrix composites are likely to have applications in aerospace technology and braking mechanisms. They are already used for nozzle flaps and seals in some military aircraft.
Bibliographic Reference: Article: Comprehensive Composite Materials, further details unknown
Availability: Comprehensive Composite Materials (Journal)
Record Number: 200012211 / Last updated on: 2000-09-20
Original language: en
Available languages: en