Last updated 13th June 2025

ISO 21971:2019 Mechanical properties of ceramic composites at ambient temperature in air at atmospheric pressure

ISO 21971:2019 discusses the parameters for determining the hoop tensile properties of ceramic matrix composite (CMC) tubes with continuous fiber reinforcement at room temperature and air pressure. Since the fiber architecture and specimen geometry factors in composite tubes differ significantly from those in flat specimens, this text is particular to the tubular geometries. The hoop's tensile strength, tensile strain at failure, and elastic constants are among the tensile qualities and stress-strain responses covered in ISO 21971:2019.

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    Introduction to ISO 21971:2019

    ISO 21971:2019 discusses several recommended test item fabrication techniques, without being limited to them. It mostly pertains to ceramic and/or glass matrix composite tubes that have a continuous fibrous reinforcement: tri-directional (xD, with 2 < x < 3), unidirectional (1D filament winding and tape lay-up), and bi-directional (2D braid and weave). These tubes are also subject to internal pressure. The data can be utilized for tubular component design data creation, material development, characterization, reliability, control of manufacturing (quality insurance), and material comparison. MaTestLab is one of the best testing service providers, with the best network of testing laboratories in the USA to carry out ISO 21971:2019 tests for our clients.

    ISO 21971:2019 Test Method

    Specimen PreparationAn adequate test fixture assembly is used to insert a prepared tubular test specimen with the required dimensions. The specimen is then exposed to indirect internal pressure loading that is monotonic until it fractures. 
    Pressure ApplicationA piston-driven hydraulic oil injection system is used to create uniform radial pressure via an elastomeric bladder housed inside the tubular test specimen. The tubular test specimen expands under pressure because the elastomeric bladder mates to its inner diameter. The test is run with either continuous strain or constant piston displacement.
    Pressure and strain measurementConcurrent measurements and records are made of the applied pressure and the resulting hoop tensile strain. While the various other hoop tensile parameters are ascertained from the stress-strain response data, the hoop tensile strength and related strain are ascertained from the burst pressure.

    ISO 21971:2019 Test Specimen

    Specimen DetailThe local strain of CMC tubular test specimens loaded by internal pressure can also be measured using the DIC approach using the displacement field measurement.
    Specimen SizeGlass matrix composite tubes and/or ceramic tubes with a continuous fiber reinforcement: subject to internal pressure, unidirectional (1D filament winding and tape lay-up), bidirectional (2D braid and weave), and tridirectional (xD, with 2 < x < 3).

    ISO 21971:2019 Test Results and Interpretation

    ISO 21971:2019 particularly examines the mechanical characteristics of ceramic composites at room temperature and atmospheric pressure, with an emphasis on determining the tubes’ hoop tensile qualities. The results offer important new information about the resilience and strength of these materials in these circumstances. 

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    ISO 21971:2019 Related Tests

    ISO 21971:2019 is related to tests, including ISO 3611 for metrological features of micrometers and ASTM E2208-02 for a standardized guide for assessing optical strain measurement systems without contact.

    FAQ's

    Where can I get the iso 21971 2019 tested?

    You can share your iso 21971 2019 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific iso 21971 2019 test to various testing techniques.

    How much do I need to pay for the iso 21971 2019 test?

    Please contact us for a detailed quote for your iso 21971 2019 testing needs. Cost incurred to carry out different iso 21971 2019 testing methodology depends on the type of raw material; number of samples, coupons, or specimens; test conditions, turn around time etc. Costs of some ASTM testing methods start from $100 and the final value depends upon the factors listed above. Please contact us for the best and latest prices.

    How many samples are required for iso 21971 2019?

    The required number of samples or specimens should comply with the procedure given in the iso 21971 2019 standard. However, the MaTestLab operations team can assist you for your special requirements once you share your testing details with us.

    How much discount can I get on the iso 21971 2019 test?

    MaTestLab has a vast testing laboratory network, hence we bring you the best testing facilities in a cost-effective way. We offer considerable discounts (15-20%) to our returning customers based on test volume and frequency.

    How many days will it take to complete the iso 21971 2019 test?

    The turnaround time for iso 21971 2019 test methodology depends upon the test procedure mentioned in the standard test document. However, we at MaTestLab understand your research requirements and hence try to get your test completed within the least possible time.

    Where can I get the iso 21971 2019 tested?

    You can share your iso 21971 2019 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific iso 21971 2019 test to various testing techniques.

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