SIST-TS CEN/TS 15658:2026

SLOVENSKI STANDARD
01-junij-2026
Sodobna tehnična keramika - Mehanske lastnosti keramičnih vlaken pri visokih
temperaturah v nereaktivnem okolju - Ugotavljanje lezenja po metodi vročega
spajanja
Advanced technical ceramics - Mechanical properties of ceramic fibres at high
temperature under non-reactive environment - Determination of creep behaviour by the
hot grip method
Hochleistungskeramik - Mechanische Eigenschaften von Keramikfasern bei hohen
Temperaturen in einer reaktionsfreien Umgebung - Bestimmung des Kriechverhaltens im
Heißeinspannungsverfahren
Céramiques techniques avancées - Propriétés mécaniques des fibres céramiques à
haute température sous environnement non réactif - Détermination du comportement au
fluage par la méthode des mors chauds
Ta slovenski standard je istoveten z: CEN/TS 15658:2026
ICS:
81.060.30 Sodobna keramika Advanced ceramics
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

CEN/TS 15658
TECHNICAL SPECIFICATION
SPÉCIFICATION TECHNIQUE
April 2026
TECHNISCHE SPEZIFIKATION
ICS 81.060.30 Supersedes CEN/TS 15658:2007
English Version
Advanced technical ceramics - Mechanical properties of
ceramic fibres at high temperature under non-reactive
environment - Determination of creep behaviour by the
hot grip method
Céramiques techniques avancées - Propriétés Hochleistungskeramik - Mechanische Eigenschaften
mécaniques des fibres céramiques à haute température von Keramikfasern bei hohen Temperaturen in einer
sous environnement non réactif - Détermination du reaktionsfreien Umgebung - Bestimmung des
comportement au fluage par la méthode des mors Kriechverhaltens im Heißeinspannungsverfahren
chauds
This Technical Specification (CEN/TS) was approved by CEN on 6 March 2026 for provisional application.

The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to
submit their comments, particularly on the question whether the CEN/TS can be converted into a European Standard.

CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS
available promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in
parallel to the CEN/TS) until the final decision about the possible conversion of the CEN/TS into an EN is reached.

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
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 15658:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Principle . 7
5 Significance and use . 7
6 Apparatus . 7
7 Test pieces . 8
7.1 General. 8
7.2 Preparation of test pieces . 8
7.3 Number of test pieces . 9
8 Test procedure . 9
8.1 Determination of the temperature profile . 9
8.2 Test set-up: other considerations . 9
8.2.1 Determination of gauge length . 9
8.2.2 Determination of the initial cross section area . 9
8.3 Loading considerations . 10
8.4 Testing technique . 10
8.4.1 General. 10
8.4.2 First step . 10
8.4.3 Test piece mounting . 10
8.4.4 Setting of an inert environment . 10
8.4.5 Heating of the test piece . 10
8.5 Measurements . 11
8.6 Test validity . 11
9 Calculation of results . 11
9.1 Creep stress . 11
9.2 Creep strain at time t . 12
9.3 Drawing of the creep curve . 12
9.4 Creep strain at rupture . 12
9.5 Creep rupture time . 12
9.6 Creep strain rate curve . 12
10 Test report . 12
Bibliography . 14

European foreword
This document (CEN/TS 15658:2026) has been prepared by Technical Committee CEN/TC 184
“Advanced technical ceramics”, the secretariat of which is held by DIN.
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 CEN/TS 15658:2007.
CEN/TS 15658:2007:
a) the title has been updated by replacing “hot end method” by “hot grip method”;
b) the normative references have been updated;
c) the definitions have been harmonized with those of document ISO 19634:2026;
d) the specifications in 7.2 have been enlarged;
e) the specifications in 8.4.3 have been shortened;
f) the document has been updated editorially.
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 organisations of the
following countries are bound to announce this Technical Specification: 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.
1 Scope
This document specifies the conditions for the determination of the tensile creep deformation and failure
of single filaments of ceramic fibres at high temperature and under test conditions that prevent changes
to the material as a result of chemical reaction with the test environment.
This document applies to continuous ceramic filaments taken from tows, yarns, braids and knitted
structures, that have strains to failure less than or equal to 5 %.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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.
EN 1007-3, Advanced technical ceramics — Ceramic composites — Methods of test for reinforcement —
Part 3: Determination of filament diameter and cross-section area
EN 60584-1, Thermocouples — Part 1: EMF Specifications and tolerances
EN ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories
(ISO/IEC 17025)
EN ISO 19630, Fine ceramics (advanced ceramics, advanced technical ceramics) — Methods of test for
reinforcements— Determination of tensile properties of filaments at ambient temperature (ISO 19630)
ISO 19634:2026, Fine ceramics (advanced ceramics, advanced technical ceramics) — Ceramic composites
— Notations
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 19634:2026 and the following
apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://www.electropedia.org/
3.1
creep
permanent time-dependent increase in gauge length starting from the time when the constant specified
level of force is reached
3.2
gauge length
L
initial inner distance between the gripped ends of filament
3.3
test temperature
T
temperature of the filament in the gauge length
3.4
initial cross section area
S
cross-section area of the test piece within the gauge length at room temperature before loading
3.5
applied tensile force
F
constant force applied to the filament during the test
3.6
applied tensile stress
σ
applied tensile force divided by the initial cross-sectional area
3.7
longitudinal deformation
A
change of the gauge length L caused by creep
3.8
creep rupture time
t
cr,m
time elapsed from the moment when loading is completed until the moment of rupture
3.9
creep strain rate
ε̇
cr(T)
change in creep strain per unit time at time t at the temperature T
3.10 Creep types
3.10.1
primary creep
part of the creep strain versus time curve which presents a decreasing creep strain rate
Note 1 to entry: See Figure 1 a) and Figure 1 b).
3.10.2
secondary creep
part of the creep strain versus time curve which presents a constant creep strain rate
Note 1 to entry: See Figure 1 a) and Figure 1 b).
3.10.3
tertiary creep
part of the creep strain versus time curve which presents an increasing creep strain rate
Note 1 to entry: See Figure 1 a) and Figure 1 b).
a) Creep strain versus time
b) Creep strain rate versus time
Key
1 creep strain ε
cr
2 time
3 primary creep
4 secondary creep
5 tertiary creep
6 creep strain rate ε̇ (creep strain with time)
cr
7 time
8 primary creep
9 secondary creep
10 tertiary creep
Figure 1 — Creep strain and creep strain rate versus time curve
4 Principle
A ceramic filament is heated to the test temperature and loaded under tension until a specified c
...