EN ISO 24370:2023

Fine ceramics (advanced ceramics, advanced technical ceramics) - Test method for fracture toughness of monolithic ceramics at room temperature by chevron-notched beam (CNB) method (ISO 24370:2005)

ISO 24370:2005 specifies a test method for determining the fracture toughness of monolithic ceramic materials at room temperature by the chevron-notched beam (CNB) method.
ISO 24370:2005 is applicable to monolithic ceramics and whisker- or particulate-reinforced ceramics that are regarded as macroscopically homogeneous. It is not applicable to continuous-fibre reinforced ceramic composites.
ISO 24370:2005 is usually applicable to ceramic materials with a fracture toughness less than about 12 megapascal(square root metre). The test method is applicable to materials with a flat crack-growth resistance curve and may be applicable to materials with a rising crack-growth resistance curve (R-curve).

Hochleistungskeramik - Prüfverfahren zur Bestimmung der Bruchzähigkeit monolithischer Keramik bei Raumtemperatur an Biegeproben mit Chevron-Kerb (CNB-Verfahren) (ISO 24370:2005)

Diese Internationale Norm legt ein Prüfverfahren für die Bestimmung der Bruchzähigkeit monolithischer Keramik bei Raumtemperatur an Biegeproben mit Chevron-Kerb (CNB-Verfahren) fest.
Diese Internationale Norm ist anwendbar für monolithische Keramik und whisker- oder partikelverstärkte Keramik, die als makroskopisch homogen gilt. Sie gilt nicht für endlosfaserverstärkte Keramikverbundwerkstoffe.
Diese Internationale Norm ist üblicherweise anwendbar für Keramikwerkstoffe mit einer Bruchzähigkeit von weniger als etwa 12 MPa(m1/2). Das Prüfverfahren ist anwendbar für Werkstoffe mit einer flachen Kurve für den Widerstand gegen Risswachstum und darf für Werkstoffe mit einer ansteigenden Kurve für den Widerstand gegen Risswachstum (R-Kurve) angewendet werden.

Céramiques techniques - Méthode d'essai de ténacité à la rupture des céramiques monolithiques à température ambiante sur éprouvette entaillée en chevron (ISO 24370:2005)

La présente Norme internationale spécifie une méthode d’essai pour déterminer la ténacité à la rupture des matériaux en céramique monolithique à température ambiante sur éprouvette entaillée en chevron.
La présente Norme internationale s’applique aux céramiques monolithiques et aux céramiques renforcées par des trichites ou des particules qui sont considérées comme macroscopiquement homogènes. Elle ne s’applique pas aux composites céramiques renforcés par des fibres continues.
La présente Norme internationale s’applique généralement aux matériaux céramiques dont la ténacité à la rupture est inférieure à environ 12 MPa(m1/2). La méthode d’essai s’applique aux matériaux présentant une courbe plate de résistance à la propagation des fissures et peut s’appliquer aux matériaux présentant une courbe croissante de résistance à la propagation des fissures (courbe en R).

Fina keramika (sodobna keramika, sodobna tehnična keramika) - Preskusne metode za ugotavljanje odpornosti monolitske keramike proti lomljenju pri sobni temperaturi z metodo upogibnega preskusa z zarezo (metoda CNB) (ISO 24370:2005)

Ta mednarodni standard ISO 24370 določa preskusno metodo za določanje lomne žilavosti monolitne keramike pri sobni temperaturi z metodo Chevron-notched beam (CNB).
Ta mednarodni standard se uporablja za monolitno keramiko in keramiko z ojačitvijo ogrcev in ojačitvijo delcev, ki se šteje za makroskopsko homogeno. Ne uporablja se za keramične kompozite z neprekinjeno ojačitvijo vlaken.
Ta mednarodni standard se običajno uporablja za keramične materiale z lomno žilavostjo, manjšo od približno 12 Mpa (m1/2). Preskusna metoda se uporablja za materiale z ravno krivuljo odpornosti na širitev razpok in jo je mogoče uporabiti za materiale s krivuljo porasta odpornosti na širitev razpok (krivulja R).

General Information

• Status: Published
• Publication Date: 21-Mar-2023
• ICS: 81.060.30 - Advanced ceramics
• Technical Committee: CEN/TC 184 - Advanced technical ceramics
• Drafting Committee: CEN/TC 184 - Advanced technical ceramics
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 22-Mar-2023
• Due Date: 06-Dec-2024
• Completion Date: 22-Mar-2023
• Ref Project: SIST EN ISO 24370:2023 - Fine ceramics (advanced ceramics, advanced technical ceramics) - Test method for fracture toughness of monolithic ceramics at room temperature by chevron-notched beam (CNB) method (ISO 24370:2005)

Relations

• Replaces: EN 14425-3:2010 - Advanced technical ceramics - Test methods for determination of fracture toughness of monolithic ceramics - Part 3: Chevron notched beam (CNB) method
• Effective Date: 18-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2023
Fina keramika (sodobna keramika, sodobna tehnična keramika) - Preskusne
metode za ugotavljanje odpornosti monolitske keramike proti lomljenju pri sobni
temperaturi z metodo upogibnega preskusa z zarezo (metoda CNB) (ISO
24370:2005)
Fine ceramics (advanced ceramics, advanced technical ceramics) - Test method for
fracture toughness of monolithic ceramics at room temperature by chevron-notched
beam (CNB) method (ISO 24370:2005)
Hochleistungskeramik - Prüfverfahren zur Bestimmung der Bruchzähigkeit
monolithischer Keramik an Biegeproben mit Chevron-Kerb (CNB-Verfahren) (ISO
24370:2005)
Céramiques techniques - Méthode d'essai de ténacité à la rupture des céramiques
monolithiques à température ambiante sur éprouvette entaillée en chevron (ISO
24370:2005)
Ta slovenski standard je istoveten z: EN ISO 24370:2023
ICS:
81.060.30 Sodobna keramika Advanced ceramics
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 24370
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2023
EUROPÄISCHE NORM
ICS 81.060.30 Supersedes EN 14425-3:2010
English Version
Fine ceramics (advanced ceramics, advanced technical
ceramics) - Test method for fracture toughness of
monolithic ceramics at room temperature by chevron-
notched beam (CNB) method (ISO 24370:2005)
Céramiques techniques - Méthode d'essai de ténacité à Hochleistungskeramik - Prüfverfahren zur
la rupture des céramiques monolithiques à Bestimmung der Bruchzähigkeit monolithischer
température ambiante sur éprouvette entaillée en Keramik an Biegeproben mit Chevron-Kerb (CNB-
chevron (ISO 24370:2005) Verfahren) (ISO 24370:2005)
This European Standard was approved by CEN on 10 March 2023.

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
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 24370:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
The text of ISO 24370:2005 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 24370:2023
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 September 2023, and conflicting national standards
shall be withdrawn at the latest by September 2023.
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.
This document supersedes EN 14425-3:2010.
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 24370:2005 has been approved by CEN as EN ISO 24370:2023 without any modification.

INTERNATIONAL ISO
STANDARD 24370
First edition
2005-06-01
Fine ceramics (advanced ceramics,
advanced technical ceramics) — Test
method for fracture toughness of
monolithic ceramics at room temperature
by chevron-notched beam (CNB) method
Céramiques techniques — Méthode d'essai de ténacité à la rupture des
céramiques monolithiques à température ambiante sur éprouvette
entaillée en chevron
Reference number
ISO 24370:2005(E)
©
ISO 2005
ISO 24370:2005(E)
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ii © ISO 2005 – All rights reserved

ISO 24370:2005(E)
Contents Page
Foreword. iv
1 Scope. 1
2 Normative references . 1
3 Terms and definitions. 1
4 Symbols . 2
5 Principle . 3
6 Apparatus. 3
6.1 Test machine . 3
6.2 Flexure fixtures . 3
6.3 Micrometer. 4
6.4 Optical microscope. 4
6.5 Stability detection equipment. 5
7 Test specimens . 5
7.1 Geometry, size, preparation and edge chamfering . 5
7.2 Number of specimens. 8
8 Procedure. 9
8.1 Permitted test environments. 9
8.2 Test specimen dimensions and alignment. 9
8.3 Post-test measurements . 10
8.4 Post-test interpretation. 10
9 Calculation. 12
9.1 Calculations of the minimum stress intensity factor coefficient Y* . 12
min
9.2 Calculation of the fracture toughness value, K . 13
I,CNB
10 Test report. 13
Bibliography . 15

ISO 24370:2005(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 24370 was prepared by Technical Committee ISO/TC 206, Fine ceramics.

iv © ISO 2005 – All rights reserved

INTERNATIONAL STANDARD ISO 24370:2005(E)

Fine ceramics (advanced ceramics, advanced technical
ceramics) — Test method for fracture toughness of monolithic
ceramics at room temperature by chevron-notched beam (CNB)
method
1 Scope
This International Standard specifies a test method for determining the fracture toughness of monolithic
ceramic materials at room temperature by the chevron-notched beam (CNB) method.
This International Standard is applicable to monolithic ceramics and whisker- or particulate-reinforced
ceramics that are regarded as macroscopically homogeneous. It is not applicable to continuous-fibre
reinforced ceramic composites.
This International Standard is usually applicable to ceramic materials with a fracture toughness less than
1/2
about 12 MPa(m ). The test method is applicable to materials with a flat crack-growth resistance curve and
may be applicable to materials with a rising crack-growth resistance curve (R-curve).
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 7500-1:2004, Metallic materials — Verification of static uniaxial testing machines — Part 1:
Tension/compression testing machines — Verification and calibration of the force-measuring system
ISO 14704:2000, Fine ceramics (advanced ceramics, advanced technical ceramics) — Test method for
flexural strength of monolithic ceramics at room temperature
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
stress intensity factor
K
I
magnitude of the elastic stress field singularity at the tip of a crack subjected to opening mode (mode I)
displacement
NO
...