EN ISO 21971:2024

Fine ceramics (advanced ceramics, advanced technical ceramics) - Mechanical properties of ceramic composites at ambient temperature in air atmospheric pressure - Determination of hoop tensile properties of tubes (ISO 21971:2019)

This document 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. This document is specific to the tubular geometries since fibre architecture and specimen geometry factors in composite tubes are distinctly different from those in flat specimens.
This document 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.
This document 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.
Values expressed in this document are in accordance with the International System of Units (SI).

Hochleistungskeramik - Mechanische Eigenschaften von keramischen Verbundwerkstoffen bei Umgebungstemperatur und atmosphärischem Luftdruck - Bestimmung der Ringzugeigenschaften von Rohren (ISO 21971:2019)

Céramiques techniques (céramiques avancées, céramiques techniques avancées) - Propriétés mécaniques des céramiques composites à température ambiante et à pression atmosphérique - Détermination des propriétés en traction circonférentielle de tubes (ISO 21971:2019)

Le présent document spécifie les conditions de détermination des propriétés en traction circonférentielle de tubes composites à matrice céramique (CMC) avec renfort de fibres continues à température ambiante et à pression atmosphérique. Il s'applique exclusivement aux tubulaire dont la géométrie est étroitement liée à la nature de l'architecture fibreuse.
Le présent document donne des informations sur le comportement en traction circonférentielle et sur les propriétés associées comme la résistance et la déformation en traction circonférentielle et les constantes élastiques. Les informations peuvent être utilisées pour le développement de matériaux, le contrôle de fabrication (assurance qualité), la comparaison de matériaux, la caractérisation ou encore pour la production de données fiables pour le dimensionnement et la conception de composants tubulaires.
Le présent document traite, sans s'y limiter, de pièces pouvant être élaborées par différentes voies. Il s'applique principalement aux tubes de céramique et/ou en verre matrice céramique avec renfort de fibres continues: unidirectionnel (enroulement filamentaire et disposition en bande 1D), bidirectionnel (tressage et tissage 2D), et tridirectionnel (xD, avec 2 < x < 3) soumis à une pression interne.
Les valeurs figurant dans le présent document sont exprimées selon le système international d'unités (SI).

Fina keramika (sodobna keramika, sodobna tehnična keramika) - Mehanske lastnosti keramičnih kompozitov pri temperaturi okolice in pri zračnem tlaku - Ugotavljanje nateznih lastnosti obroča cevi (ISO 21971:2019)

General Information

• Status: Published
• Publication Date: 01-Oct-2024
• ICS: 81.060.30 - Advanced ceramics
• Technical Committee: CEN/TC 184 - Advanced technical ceramics
• Drafting Committee: CEN/TC 184/SC 1 - Ceramic composites
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 02-Oct-2024
• Due Date: 19-Jul-2026
• Completion Date: 02-Oct-2024
• Ref Project: SIST EN ISO 21971:2024 - Fine ceramics (advanced ceramics, advanced technical ceramics) - Mechanical properties of ceramic composites at ambient temperature in air atmospheric pressure - Determination of hoop tensile properties of tubes (ISO 21971:2019)

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2024
Fina keramika (sodobna keramika, sodobna tehnična keramika) - Mehanske
lastnosti keramičnih kompozitov pri temperaturi okolice in pri zračnem tlaku -
Ugotavljanje nateznih lastnosti obroča cevi (ISO 21971:2019)
Fine ceramics (advanced ceramics, advanced technical ceramics) - Mechanical
properties of ceramic composites at ambient temperature in air atmospheric pressure -
Determination of hoop tensile properties of tubes (ISO 21971:2019)
Hochleistungskeramik - Zugfestigkeitseigenschaften von endlosfaserverstärkten
keramischen Verbundrohren bei Umgebungstemperatur (ISO 21971:2019)
Céramiques techniques (céramiques avancées, céramiques techniques avancées) -
Propriétés mécaniques des céramiques composites à température ambiante et à
pression atmosphérique - Détermination des propriétés en traction circonférentielle de
tubes (ISO 21971:2019)
Ta slovenski standard je istoveten z: EN ISO 21971:2024
ICS:
81.060.30 Sodobna keramika Advanced ceramics
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 21971
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2024
EUROPÄISCHE NORM
ICS 81.060.30
English Version
Fine ceramics (advanced ceramics, advanced technical
ceramics) - Mechanical properties of ceramic composites
at ambient temperature in air atmospheric pressure -
Determination of hoop tensile properties of tubes (ISO
21971:2019)
Céramiques techniques (céramiques avancées, Hochleistungskeramik - Mechanische Eigenschaften
céramiques techniques avancées) - Propriétés von keramischen Verbundwerkstoffen bei
mécaniques des céramiques composites à température Umgebungstemperatur und atmosphärischen
ambiante et à pression atmosphérique - Détermination Luftdruck - Bestimmung der Ringzugeigenschaften von
des propriétés en traction circonférentielle de tubes Rohren (ISO 21971:2019)
(ISO 21971:2019)
This European Standard was approved by CEN on 30 September 2024.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 21971:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
The text of ISO 21971:2019 has been prepared by Technical Committee ISO/TC 206 "Fine ceramics” of
the International Organization for Standardization (ISO) and has been taken over as EN ISO 21971:2024
by Technical Committee CEN/TC 184 “Advanced technical ceramics” the secretariat of which is held by
DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by April 2025, and conflicting national standards shall be
withdrawn at the latest by April 2025.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 21971:2019 has been approved by CEN as EN ISO 21971:2024 without any modification.

INTERNATIONAL ISO
STANDARD 21971
First edition
2019-12
Fine ceramics (advanced ceramics,
advanced technical ceramics) —
Mechanical properties of ceramic
composites at ambient temperature
in air atmospheric pressure —
Determination of hoop tensile
properties of tubes
Céramiques techniques (céramiques avancées, céramiques techniques
avancées) — Propriétés mécaniques des céramiques composites à
température ambiante et à pression atmosphérique — Détermination
des propriétés en traction circonférentielle de tubes
Reference number
ISO 21971:2019(E)
©
ISO 2019
ISO 21971:2019(E)
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Fax: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved

ISO 21971:2019(E)
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 3
5 Apparatus . 4
5.1 Pressurizing system . 4
5.2 Test specimen gripping and end closure . 4
5.3 Strain measurement . 5
5.3.1 General. 5
5.3.2 Strain gauges . 5
5.3.3 Digital image correlation . 5
5.4 Pressure and data recording systems . 6
5.5 Measurement of dimensions . 6
6 Tubular test specimen . 7
6.1 Specimen specifications . 7
6.1.1 General. 7
6.1.2 Dimension . 7
6.1.3 Geometry . 7
6.1.4 Tolerances and variability . . 8
6.2 Specimen preparation . 8
6.2.1 General. 8
6.2.2 As-fabricated . 8
6.2.3 Application-matched machining . 9
6.2.4 Customary practices . 9
6.2.5 Standard procedure. 9
6.3 Test count and test specimens sampling . 9
7 Test procedure . 9
7.1 General . 9
7.2 Test mode and rates . 9
7.3 Testing technique .10
7.3.1 Measurement of test specimen dimensions .10
7.3.2 Instrumentation of test specimen .10
7.3.3 Setting-up of strain measurement means .10
7.3.4 Measurements .11
7.3.5 Post-test analyses .12
7.4 Test validity .12
8 Calculation of results .12
8.1 Test specimen origin .12
8.2 Hoop tensile stress and strain .12
8.
...