This preview is downloaded from www.sis.se. Buy the entire standard via https://www.sis.
se/std-917382
INTERNATIONAL ISO
STANDARD 17140
First edition
2014-06-01
Fine ceramics (advanced ceramics,
advanced technical ceramics) —
Mechanical properties of ceramic
composites at room temperature —
Determination of fatigue properties at
constant amplitude
Céramiques techniques — Propriétés mécaniques des composites
céramiques à température ambiante — Détermination des propriétés
de fatigue à amplitude constante
Reference number
ISO 17140:2014(E)
© ISO 2014
This preview is downloaded from www.sis.se. Buy the entire standard via https://www.sis.se/std-917382
ISO 17140:2014(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2014
All rights reserved. Unless otherwise specified, 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
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2014 – All rights reserved
This preview is downloaded from www.sis.se. Buy the entire standard via https://www.sis.se/std-917382
ISO 17140:2014(E)
Contents Page
Foreword......................................................................................................................................................................................................................................... iv
1 Scope.................................................................................................................................................................................................................................. 1
2 Normative references....................................................................................................................................................................................... 1
3 Terms and definitions...................................................................................................................................................................................... 1
3.1 General............................................................................................................................................................................................................ 1
3.2 Cyclic fatigue phenomena............................................................................................................................................................... 3
4 Principle......................................................................................................................................................................................................................... 5
5 Significance and use........................................................................................................................................................................................... 5
6 Apparatus...................................................................................................................................................................................................................... 6
6.1 Fatigue test machine........................................................................................................................................................................... 6
6.2 Load train..................................................................................................................................................................................................... 6
6.3 Extensometer............................................................................................................................................................................................ 7
6.4 Data recording system....................................................................................................................................................................... 7
6.5 Micrometers............................................................................................................................................................................................... 7
7 Test specimens........................................................................................................................................................................................................ 7
8 Test specimen preparation......................................................................................................................................................................... 8
8.1 Machining and preparation........................................................................................................................................................... 8
8.2 Number of test specimens.............................................................................................................................................................. 8
9 Test procedure......................................................................................................................................................................................................... 8
9.1 Measurement of test specimen dimensions................................................................................................................... 8
9.2 Testing technique................................................................................................................................................................................... 9
9.3 Test validity................................................................................................................................................................................................. 9
10 Calculation of results.....................................................................................................................................................................................10
10.1 Time to failure, tf.................................................................................................................................................................................. 10
10.2 Damage parameters......................................................................................................................................................................... 10
10.3 Residual properties........................................................................................................................................................................... 10
11 Test report................................................................................................................................................................................................................. 12
Annex A (informative) Schematic evolution of E....................................................................................................................................14
© ISO 2014 – All rights reserved iii
This preview is downloaded from www.sis.se. Buy the entire standard via https://www.sis.se/std-917382
ISO 17140:2014(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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers
to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 206, Fine ceramics.
iv © ISO 2014 – All rights reserved
This preview is downloaded from www.sis.se. Buy the entire standard via https://www.sis.se/std-917382
INTERNATIONAL STANDARD ISO 17140:2014(E)
Fine ceramics (advanced ceramics, advanced technical
ceramics) — Mechanical properties of ceramic composites
at room temperature — Determination of fatigue
properties at constant amplitude
1 Scope
This International Standard specifies the conditions for the determination of properties at constant-
amplitude of load or strain in uniaxial tension/tension or in uniaxial tension/compression cyclic fatigue
of ceramic matrix composite materials (CMCs) with fibre reinforcement at room temperature.
This International Standard applies to all ceramic matrix composites with fibre reinforcement,
unidirectional (1D), bi-directional (2D), and tri-directional (xD, where 2 < x ≤ 3).
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 3611, Geometrical product specifications (GPS) — Dimensional measuring equipment: Micrometers for
external measurements — Design and metrological characteristics
ISO 7500-1, Metallic materials — Verification of static uniaxial testing machines — Part 1: Tension/compression
testing machines — Verification and calibration of the force-measuring system
ISO 9513, Metallic materials — Calibration of extensometer systems used in uniaxial testing
ISO 14544, Fine ceramics (advanced ceramics, advanced technical ceramics) — Mechanical properties of
ceramic composites at high temperature — Determination of compression properties
ISO 14574, Fine ceramics (advanced ceramics, advanced technical ceramics) — Mechanical properties of
ceramic composites at high temperature — Determination of tensile properties
ISO 15733, Fine ceramics (advanced ceramics, advanced technical ceramics) — Mechanical properties
of ceramic composites at ambient temperature in air atmospheric pressure — Determination of tensile
properties
CEN/TR 13233, Advanced technical ceramics — Notations and symbols
3 Terms and definitions
For the purposes of this document, the terms and definitions given in CEN/TR 132331) and the following
apply.
3.1 General
3.1.1
calibrated length
l
part of the test specimen which has uniform and minimum cross-section area
1) Intended to be substituted by a future International Standard.
© ISO 2014 – All rights reserved 1
This preview is downloaded from www.sis.se. Buy the entire standard via https://www.sis.se/std-917382
ISO 17140:2014(E)
3.1.2
gauge length
Lo
initial distance between reference points on the test specimen in the calibrated length
3.1.3
initial cross-section area
So
initial cross-section area of the test specimen within the calibrated length, at the test temperature
Note 1 to entry: Two initial cross-section areas of the test specimen can be defined:
— apparent cross-section area: this is the total area of the cross-section, So app;
— effective cross-section area: this is the total area corrected by a factor to account for the presence of a coating,
So eff.
3.1.4
longitudinal deformation
A
change in the gauge length between reference points under an uniaxial force
3.1.5
strain
ε
relative change in the gauge length defined as the ratio, A/Lo
3.1.6
stress
σ
force supported by the test specimen at any time in the test, divided by the initial cross-section area
Note 1 to entry: Two stresses can be distinguished:
— apparent stress, σapp, when the apparent cross-section area (or total cross-section area) is used;
— effective stress, σeff, when the effective cross-section area is used.
Note 2 to entry: Stress can be either in tension or in compression.
3.1.7
constant amplitude loading
in cyclic fatigue loading, constant wave form loading in which the peak loads and the valley loads are
kept constant during the test (see Figure 1 for nomenclature relevant to cyclic fatigue testing)
2 © ISO 2014 – All rights reserved
This preview is downloaded from www.sis.se. Buy the entire standard via https://www.sis.se/std-917382
ISO 17140:2014(E)
10 6
8
3
4
5
Key
1 time 6 mean
2 control parameter (test mode) 7 peak (maximum)
3 triangular form 8 valley (minimum)
4 trapezoidal form 9 amplitude
5 sinusoidal form 10 range
Figure 1 — Cyclic fatigue nomenclature and wave forms
3.2 Cyclic fatigue phenomena
NOTE Stress-strain curve parameters are defined as given in Figure 2.
3.2.1 Load ratio
3.2.1.1
load ratio
R
in cyclic fatigue loading, the algebraic ratio of the two loading parameters of a cycle
Note 1 to entry: The most widely used ratios are
— R = (minimum load/maximum load), or
— R = (valley load/peak load).
© ISO 2014 – All rights reserved 3
This preview is downloaded from www.sis.se. Buy the entire standard via https://www.sis.se/std-917382
ISO 17140:2014(E)
3.2.2 Cyclic fatigue stress
3.2.2.1
maximum stress
σmax
maximum applied stress during cyclic fatigue
3.2.2.2
minimum stress
σmin
minimum applied stress during cyclic fatigue
3.2.2.3
mean stress
σm
average applied stress during cyclic fatigue
σ max + σ min
Note 1 to entry: σ m =
2
3.2.2.4
stress amplitude
σa
difference between the maximum stress and the minimum stress
σ max − σ min
Note 1 to entry: σ a = = σ max − σ m = σ m − σ min
2
3.2.3 Cyclic fatigue strain
3.2.3.1
maximum strain
εmax
maximum applied strain during cyclic fatigue
3.2.3.2
minimum strain
εmin
minimum applied strain during cyclic fatigue
3.2.3.3
mean strain
εm
average applied strain during cyclic fatigue
ε + ε min
Note 1 to entry: ε m = max
2
3.2.3.4
strain amplitude
εa
difference between the maximum stress and the minimum stress
ε − ε min
Note 1 to entry: ε a = max = ε max − ε m = ε m − ε min
2
3.2.4 Fatigue parameters
3.2.4.1
number of cycles
N
total number of loading cycles which is applied to the test specimen during the test
4 © ISO 2014 – All rights reserved
