Textiles - Determination of the elasticity of fabrics - Part 2: Multiaxial tests (ISO 20932-2:2018)

This document specifies the test methods which can be used to measure elasticity and related properties of fabrics when they undergo a deformation of their surface. Two methods are specified: a dynamic method (method A) and a static method (method B). This document does not apply to narrow fabrics.
The results obtained cannot be compared. The choice of test method are agreed between parties and indicated in the test report.

Textilien - Bestimmung der Elastizität von textilen Flächengebilden - Teil 2: Multiaxiale Prüfungen (ISO 20932-2:2018)

Dieses Dokument legt die Prüfverfahren fest, die zur Messung der Elastizität und zugehöriger Eigenschaften von textilen Flächengebilden angewendet werden können, wenn deren Oberfläche einer Verformung ausgesetzt wird. Zwei Verfahren werden festgelegt: ein dynamisches Verfahren (Verfahren A) und ein statisches Verfahren (Verfahren B). Dieses Dokument ist nicht anzuwenden für Schmaltextilien.
Die erhaltenen Ergebnisse können nicht verglichen werden. Die Wahl des Prüfverfahrens wird zwischen den Parteien vereinbart und im Prüfbericht angegeben.

Textiles - Détermination de l'élasticité des étoffes - Partie 2: Essais multiaxiaux (ISO 20932-2:2018)

Le présent document spécifie les méthodes d'essai qui peuvent être appliquées pour mesurer l'élasticité et les propriétés afférentes des étoffes lorsqu'elles sont soumises à la déformation de leur surface. Il spécifie deux méthodes: une méthode dynamique (méthode A) et une méthode statique (méthode B). Le présent document ne s'applique pas aux étoffes étroites.
Les résultats obtenus ne peuvent être comparés. Le choix de la méthode fait l'objet d'un accord entre les parties intéressées et est indiqué dans le rapport d'essai.

Tekstilije - Ugotavljanje elastičnosti tkanin - 2. del: Večosni preskusi (ISO 20932-2:2018)

General Information

Status
Published
Publication Date
25-Feb-2020
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
26-Feb-2020
Completion Date
26-Feb-2020

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SLOVENSKI STANDARD
SIST EN ISO 20932-2:2020
01-maj-2020
Nadomešča:
SIST EN 14704-2:2007

Tekstilije - Ugotavljanje elastičnosti tkanin - 2. del: Večosni preskusi (ISO 20932-

2:2018)

Textiles - Determination of the elasticity of fabrics - Part 2: Multiaxial tests (ISO 20932-

2:2018)

Textilien - Bestimmung der Elastizität von textilen Flächengebilden - Teil 2: Multiaxiale

Prüfungen (ISO 20932-2:2018)

Textiles - Détermination de l'élasticité des étoffes - Partie 2: Essais multiaxiaux (ISO

20932-2:2018)
Ta slovenski standard je istoveten z: EN ISO 20932-2:2020
ICS:
59.080.01 Tekstilije na splošno Textiles in general
SIST EN ISO 20932-2:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN ISO 20932-2:2020
---------------------- Page: 2 ----------------------
SIST EN ISO 20932-2:2020
EN ISO 20932-2
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2020
EUROPÄISCHE NORM
ICS 59.080.30 Supersedes EN 14704-2:2007
English Version
Textiles - Determination of the elasticity of fabrics - Part 2:
Multiaxial tests (ISO 20932-2:2018)

Textiles - Détermination de l'élasticité des étoffes - Textilien - Bestimmung der Elastizität von textilen

Partie 2: Essais multiaxiaux (ISO 20932-2:2018) Flächengebilden - Teil 2: Multiaxiale Prüfungen (ISO

20932-2:2018)
This European Standard was approved by CEN on 11 November 2019.

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, Turkey 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

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 20932-2:2020 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 20932-2:2020
EN ISO 20932-2:2020 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

---------------------- Page: 4 ----------------------
SIST EN ISO 20932-2:2020
EN ISO 20932-2:2020 (E)
European foreword

The text of ISO 20932-2:2018 has been prepared by Technical Committee ISO/TC 38 "Textiles” of the

International Organization for Standardization (ISO) and has been taken over as EN ISO 20932-2:2020

by Technical Committee CEN/TC 248 “Textiles and textile products” the secretariat of which is held by

BSI.

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 August 2020, and conflicting national standards shall

be withdrawn at the latest by August 2020.

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 14704-2:2007.

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, Turkey and the

United Kingdom.
Endorsement notice

The text of ISO 20932-2:2018 has been approved by CEN as EN ISO 20932-2:2020 without any

modification.
---------------------- Page: 5 ----------------------
SIST EN ISO 20932-2:2020
---------------------- Page: 6 ----------------------
SIST EN ISO 20932-2:2020
INTERNATIONAL ISO
STANDARD 20932-2
First edition
2018-11
Textiles — Determination of the
elasticity of fabrics —
Part 2:
Multiaxial tests
Textiles — Détermination de l'élasticité des étoffes —
Partie 2: Essais multiaxiaux
Reference number
ISO 20932-2:2018(E)
ISO 2018
---------------------- Page: 7 ----------------------
SIST EN ISO 20932-2:2020
ISO 20932-2:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

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: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 20932-2:2020
ISO 20932-2:2018(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Principle ........................................................................................................................................................................................................................ 2

5 Sampling ........................................................................................................................................................................................................................ 2

6 Atmosphere for conditioning and testing .................................................................................................................................. 2

7 Preparation of test specimens ................................................................................................................................................................ 3

8 Method A — Dynamic test ........................................................................................................................................................................... 3

8.1 Apparatus .................................................................................................................................................................................................... 3

8.2 Test specimen preparation ........................................................................................................................................................... 3

8.3 Procedure for loading test specimen in clamping ring ........................................................................................ 4

8.4 Recording ..................................................................................................................................................................................................... 4

8.5 Expressions and calculations of test results .................................................................................................................. 4

8.6 Test report ................................................................................................................................................................................................... 5

9 Method B — Static test .................................................................................................................................................................................... 5

9.1 Preliminary test ...................................................................................................................................................................................... 5

9.1.1 Apparatus ............................................................................................................................................................................... 5

9.1.2 Preparation of test specimens .............................................................................................................................. 5

9.1.3 Procedure ............................................................................................................................................................................... 5

9.2 Actual static test ..................................................................................................................................................................................... 6

9.2.1 Apparatus ............................................................................................................................................................................... 6

9.2.2 Selection of testing parameters .......................................................................................................................... 6

9.2.3 Preparation of test specimens .............................................................................................................................. 6

9.2.4 Procedure ............................................................................................................................................................................... 6

9.2.5 Setting of the hemispherical shape .................................................................................................................. 6

9.2.6 Measurement of the residual deformation................................................................................................ 7

9.2.7 Recording ............................................................................................................................................................................... 7

9.2.8 Expressions and calculations of test results ............................................................................................ 7

9.2.9 Test report ............................................................................................................................................................................. 7

Annex A (informative) Example of a typical cycling graph ............................................................................................................ 9

Annex B (informative) Procedure for sampling .....................................................................................................................................10

Annex C (informative) Example of a pattern for cutting test specimens from a laboratory

sample ..........................................................................................................................................................................................................................11

Annex D (informative) Method A — Dynamic test equipment................................................................................................12

Annex E (informative) Method B — Static test equipment .........................................................................................................15

Bibliography .............................................................................................................................................................................................................................17

© ISO 2018 – All rights reserved iii
---------------------- Page: 9 ----------------------
SIST EN ISO 20932-2:2020
ISO 20932-2:2018(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 voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following

URL: www .iso .org/iso/foreword .html.

This document was prepared by Technical Committee ISO/TC 38, Textiles, Subcommittee SC 24,

Conditioning atmospheres and physical tests for textile fabrics.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/members .html.
A list of all parts in the ISO 20932 series can be found on the ISO website.
iv © ISO 2018 – All rights reserved
---------------------- Page: 10 ----------------------
SIST EN ISO 20932-2:2020
ISO 20932-2:2018(E)
Introduction

This document was developed as a result of technical advancements in yarn and fabric structures and

properties, which increase product range and developments.
[1]
This document is based on EN 14704-2 .
© ISO 2018 – All rights reserved v
---------------------- Page: 11 ----------------------
SIST EN ISO 20932-2:2020
---------------------- Page: 12 ----------------------
SIST EN ISO 20932-2:2020
INTERNATIONAL STANDARD ISO 20932-2:2018(E)
Textiles — Determination of the elasticity of fabrics —
Part 2:
Multiaxial tests
1 Scope

This document specifies the test methods which can be used to measure elasticity and related

properties of fabrics when they undergo a deformation of their surface. Two methods are specified: a

dynamic method (method A) and a static method (method B). This document does not apply to narrow

fabrics.

The results obtained cannot be compared. The choice of test method are agreed between parties and

indicated in the test report.
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.

ISO 139, Textiles — Standard atmospheres for conditioning and testing

ISO 7500-1, Metallic materials — Calibration and verification of static uniaxial testing machines — Part 1:

Tension/compression testing machines — Calibration and verification of the force-measuring system

ISO 10012, Measurement management systems — Requirements for measurement processes and measuring

equipment

ISO 20932-1, Textiles — Determination of the elasticity of fabrics — Part 1: Strip tests

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological 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
narrow fabric

woven or knitted construction intended for use as a trim, binding, edging, strapping or harness, and

designed to be used in its full width
[SOURCE: ISO 20932-1:2018, 3.1]
3.2
elasticity

ability to recover original size and shape immediately after the removal of the force causing

deformation
[SOURCE: ISO 20932-1:2018, 3.2]
© ISO 2018 – All rights reserved 1
---------------------- Page: 13 ----------------------
SIST EN ISO 20932-2:2020
ISO 20932-2:2018(E)
3.3
constant-rate-of-extension testing machine
CRE testing machine

tensile testing machine provided with one clamp, which is stationary and another clamp, which moves

with a constant speed throughout the test, the entire testing system being virtually free from deflection

[SOURCE: ISO 20932-1:2018, 3.
...

SLOVENSKI STANDARD
oSIST prEN ISO 20932-2:2019
01-julij-2019

Tekstilije - Ugotavljanje elastičnosti tkanin - 2. del: Večosni preskusi (ISO 20932-

2:2018)

Textiles - Determination of the elasticity of fabrics - Part 2: Multiaxial tests (ISO 20932-

2:2018)

Textiles - Détermination de l'élasticité des étoffes - Partie 2: Essais multiaxiaux (ISO

20932-2:2018)
Ta slovenski standard je istoveten z: prEN ISO 20932-2
ICS:
59.080.01 Tekstilije na splošno Textiles in general
oSIST prEN ISO 20932-2:2019 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN ISO 20932-2:2019
---------------------- Page: 2 ----------------------
oSIST prEN ISO 20932-2:2019
INTERNATIONAL ISO
STANDARD 20932-2
First edition
2018-11
Textiles — Determination of the
elasticity of fabrics —
Part 2:
Multiaxial tests
Textiles — Détermination de l'élasticité des étoffes —
Partie 2: Essais multiaxiaux
Reference number
ISO 20932-2:2018(E)
ISO 2018
---------------------- Page: 3 ----------------------
oSIST prEN ISO 20932-2:2019
ISO 20932-2:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

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: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
---------------------- Page: 4 ----------------------
oSIST prEN ISO 20932-2:2019
ISO 20932-2:2018(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Principle ........................................................................................................................................................................................................................ 2

5 Sampling ........................................................................................................................................................................................................................ 2

6 Atmosphere for conditioning and testing .................................................................................................................................. 2

7 Preparation of test specimens ................................................................................................................................................................ 3

8 Method A — Dynamic test ........................................................................................................................................................................... 3

8.1 Apparatus .................................................................................................................................................................................................... 3

8.2 Test specimen preparation ........................................................................................................................................................... 3

8.3 Procedure for loading test specimen in clamping ring ........................................................................................ 4

8.4 Recording ..................................................................................................................................................................................................... 4

8.5 Expressions and calculations of test results .................................................................................................................. 4

8.6 Test report ................................................................................................................................................................................................... 5

9 Method B — Static test .................................................................................................................................................................................... 5

9.1 Preliminary test ...................................................................................................................................................................................... 5

9.1.1 Apparatus ............................................................................................................................................................................... 5

9.1.2 Preparation of test specimens .............................................................................................................................. 5

9.1.3 Procedure ............................................................................................................................................................................... 5

9.2 Actual static test ..................................................................................................................................................................................... 6

9.2.1 Apparatus ............................................................................................................................................................................... 6

9.2.2 Selection of testing parameters .......................................................................................................................... 6

9.2.3 Preparation of test specimens .............................................................................................................................. 6

9.2.4 Procedure ............................................................................................................................................................................... 6

9.2.5 Setting of the hemispherical shape .................................................................................................................. 6

9.2.6 Measurement of the residual deformation................................................................................................ 7

9.2.7 Recording ............................................................................................................................................................................... 7

9.2.8 Expressions and calculations of test results ............................................................................................ 7

9.2.9 Test report ............................................................................................................................................................................. 7

Annex A (informative) Example of a typical cycling graph ............................................................................................................ 9

Annex B (informative) Procedure for sampling .....................................................................................................................................10

Annex C (informative) Example of a pattern for cutting test specimens from a laboratory

sample ..........................................................................................................................................................................................................................11

Annex D (informative) Method A — Dynamic test equipment................................................................................................12

Annex E (informative) Method B — Static test equipment .........................................................................................................15

Bibliography .............................................................................................................................................................................................................................17

© ISO 2018 – All rights reserved iii
---------------------- Page: 5 ----------------------
oSIST prEN ISO 20932-2:2019
ISO 20932-2:2018(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 voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following

URL: www .iso .org/iso/foreword .html.

This document was prepared by Technical Committee ISO/TC 38, Textiles, Subcommittee SC 24,

Conditioning atmospheres and physical tests for textile fabrics.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/members .html.
A list of all parts in the ISO 20932 series can be found on the ISO website.
iv © ISO 2018 – All rights reserved
---------------------- Page: 6 ----------------------
oSIST prEN ISO 20932-2:2019
ISO 20932-2:2018(E)
Introduction

This document was developed as a result of technical advancements in yarn and fabric structures and

properties, which increase product range and developments.
[1]
This document is based on EN 14704-2 .
© ISO 2018 – All rights reserved v
---------------------- Page: 7 ----------------------
oSIST prEN ISO 20932-2:2019
---------------------- Page: 8 ----------------------
oSIST prEN ISO 20932-2:2019
INTERNATIONAL STANDARD ISO 20932-2:2018(E)
Textiles — Determination of the elasticity of fabrics —
Part 2:
Multiaxial tests
1 Scope

This document specifies the test methods which can be used to measure elasticity and related

properties of fabrics when they undergo a deformation of their surface. Two methods are specified: a

dynamic method (method A) and a static method (method B). This document does not apply to narrow

fabrics.

The results obtained cannot be compared. The choice of test method are agreed between parties and

indicated in the test report.
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.

ISO 139, Textiles — Standard atmospheres for conditioning and testing

ISO 7500-1, Metallic materials — Calibration and verification of static uniaxial testing machines — Part 1:

Tension/compression testing machines — Calibration and verification of the force-measuring system

ISO 10012, Measurement management systems — Requirements for measurement processes and measuring

equipment

ISO 20932-1, Textiles — Determination of the elasticity of fabrics — Part 1: Strip tests

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological 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
narrow fabric

woven or knitted construction intended for use as a trim, binding, edging, strapping or harness, and

designed to be used in its full width
[SOURCE: ISO 20932-1:2018, 3.1]
3.2
elasticity

ability to recover original size and shape immediately after the removal of the force causing

deformation
[SOURCE: ISO 20932-1:2018, 3.2]
© ISO 2018 – All rights reserved 1
---------------------- Page: 9 ----------------------
oSIST prEN ISO 20932-2:2019
ISO 20932-2:2018(E)
3.3
constant-rate-of-extension testing machine
CRE testing machine

tensile testing machine provided with one clamp, which is stationary and another clamp, which moves

with a constant speed throughout the test, the entire testing system being virtually free from deflection

[SOURCE: ISO 20932-1:2018, 3.3]
3.4
bagging

residual deformation (3.6) between the original state and the state of the surface when it has undergone

a multidirectional force, which by repetition creates a “bag”
Note 1 to entry: Bagging is expressed in units of the length.
3.5
maximum deformation

deformation developed when a specified force is applied to the surface of the test specimen compared

to the original state of a test specimen
Note 1 to entry: Maximum deformation is expressed in units of the length.
3.6
residual deformation

deformation after the removal of the hemispherical probe and an agreed recovery time

Note 1 to entry: Residual deformation is expressed in units of the length.
3.7
maximum force
force at the position when a test specimen is taken to a fixed distension
Note 1 to entry: Maximum force is expressed in newtons.
3.8
modulus
force measured at a given distension on either the load or unload curves
3.9
cycle

process whereby a fabric is taken from the original position to a fixed load or fixed distension and

returned to the original position
4 Principle

A fabric test specimen of specified dimensions is distended at a constant rate to either a specified

force or distension for an agreed number of cycles, and its elasticity determined by measuring certain

characteristics.
5 Sampling

Fabric samples shall be selected in accordance with the product specification. In the absence of a

product specification for the fabric, the sampling method given in Annex B may be used.

6 Atmosphere for conditioning and testing

The atmospheres for preconditioning, conditioning and testing shall be as specified in ISO 139.

2 © ISO 2018 – All rights reserved
---------------------- Page: 10 ----------------------
oSIST prEN ISO 20932-2:2019
ISO 20932-2:2018(E)

The fabric samples shall be conditioned for a minimum of 20 h in a tension-free state. The prepared test

specimens shall be conditioned in a tension-free state for a further 4 h after preparation, to minimize

the effects of handling during preparation.
7 Preparation of test specimens
From each laboratory sample, prepare a mini
...

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