What is ISO 21971 - Mechanical properties of ceramic composites about?
ISO 21971 is an international standard on fine ceramics which covers the mechanical properties of ceramic composites at ambient temperature in air atmospheric pressure.
ISO 21971 specifies the conditions for the determination of hoop tensile properties of ceramic matrix composite (CMC) tubes with continuous fibre-reinforcement at ambient temperature in air atmospheric pressure. ISO 21971 is specific to the tubular geometries since fibre architecture and specimen geometry factors in composite tubes are distinctly different from those in flat specimens.
Who is ISO 21971 - Mechanical properties of ceramic composites for?
ISO 21971 on mechanical properties of ceramic composites is useful for:
- Fine ceramics manufacturers
- Mechanical engineers
Why should you use ISO 21971 - Mechanical properties of ceramic composites?
Ceramic matrix composites are a subgroup of composite materials and a subgroup of ceramics. They consist of ceramic fibers embedded in a ceramic matrix. The fibers and the matrix both can consist of any ceramic material, whereby carbon and carbon fibers can also be regarded as a ceramic material.
The hoop tensile strength and the hoop fracture strength are determined from the resulting maximum pressure and the pressure at fracture, respectively. The hoop tensile strains, the hoop proportional limit stress, and the modulus of elasticity in the hoop direction are determined from the stress-strain data.
ISO 21971 provides information on the hoop tensile properties and stress-strain response, such as hoop tensile strength, hoop tensile strain at failure and elastic constants. The information can be used for material development, control of manufacturing (quality insurance), material comparison, characterization, reliability and design data generation for tubular components.
ISO 21971 addresses, but is not restricted to, various suggested test piece fabrication methods. It applies primarily to ceramic and/or glass matrix composite tubes with a continuous fibrous reinforcement: unidirectional (1D filament winding and tape lay-up), bi-directional (2D braid and weave) and tri-directional (xD, with 2 < x < 3), subjected to an internal pressure.
As ISO 21971 helps you determine the hoop strength, you get more information about your ceramic composite this can help you in increasing reliability and credibility among your customers.