Optical fibres - Part 1-31: Measurement methods and test procedures - Tensile strength

IEC 60793-1-31:2010(E) provides values of the tensile strength of optical fibre samples and establishes uniform requirements for the mechanical characteristic - tensile strength. The method tests individual lengths of uncabled and unbundled glass optical fibre. Sections of fibre are broken with controlled increasing stress or strain that is uniform over the entire fibre length and cross section. The stress or strain is increased at a nominally constant rate until breakage occurs. The main change with respect to the previous edition is the addition of comprehensive details, such as examples of fibre clamping as given in Annexes A, B and C.

Lichtwellenleiter - Teil 1-31: Messmethoden und Prüfverfahren - Zugfestigkeit

Fibres optiques - Partie 1-31 : Méthodes de mesure et procédures d’essai – Résistance à la traction

La CEI 60793-1-31:2010 fournit des valeurs de résistance à la traction d'échantillons de fibre optique et détermine des exigences uniformes pour la caractéristique mécanique de résistance à la traction. La principale modification par rapport à l'édition précédente est l'addition de détails exhaustifs, tels que des exemples d'accrochage de fibres, indiqués dans les Annexes A, B et C.

Optična vlakna - 1-31. del: Metode merjenja in preskusni postopki - Natezna trdnost (IEC 60793-1-31:2010)

Ta del IEC 60793 zagotavlja vrednosti natezne moči vzorcev optičnih vlaken in vzpostavlja enotne zahteve za mehansko značilnost - natezno trdnost. Metoda preskuša posamične dolžine steklenega optičnega vlakna, ki se ne nahaja v kablu ali svežnju. Odseki vlakna so prelomljeni z nadzorovano naraščajočo obremenitvijo ali napetostjo, ki je enaka po celotni dolžini vlakna in prečno. Obremenitev ali napetost se zvišuje pri stalni nazivni stopnji, dokler ne pride do preloma. Porazdelitev vrednosti natezne trdnosti danega vlakna je veliki meri odvisna od dolžine vzorca, hitrosti obremenitve in okoljskih pogojev. Preskus se lahko uporablja za nadzor, kadar se zahtevajo statistični podatki ali moč vlakna. Rezultati se izrazijo s statistično porazdelitvijo nadzora kakovosti. Običajno je preskus izveden po tem, ko se s temperaturo in vlago pripravi vzorec.    Vendar lahko v nekaterih primerih zadostuje merjenje vrednosti pri temperaturi in pogoji vlažnosti okolja. Ta metoda se ne uporablja za tipe optičnih vlaken A1, A2, A3, B in C. Opozorilo – ta preskus vključuje odseke raztegovanja optičnih vlaken, dokler ne pride do preloma. Ob prelomu se delci stekla lahko porazdelijo po preskusnem območju. Priporočajo se zaščitnih zaslonov. Na preskusnem območju je potrebno vedno nositi zaščitna očala.

General Information

Status
Withdrawn
Publication Date
23-Sep-2010
Current Stage
6060 - Document made available
Due Date
01-Dec-2010
Completion Date
24-Sep-2010

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SLOVENSKI STANDARD
SIST EN 60793-1-31:2010
01-november-2010
1DGRPHãþD
SIST EN 60793-1-31:2004
2SWLþQDYODNQDGHO0HWRGHPHUMHQMDLQSUHVNXVQLSRVWRSNL1DWH]QD
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Optical fibres - Part 1-31: Measurement methods and test procedures - Tensile strength

(IEC 60793-1-31:2010)

Lichtwellenleiter - Teil 1-31: Messmethoden und Prüfverfahren - Zugfestigkeit (IEC

60793-1-31:2010)

Fibres optiques - Partie 1-31 : Méthodes de mesure et procédures d’essai - Résistance à

la traction (CEI 60793-1-31:2010)
Ta slovenski standard je istoveten z: EN 60793-1-31:2010
ICS:
33.180.10 2SWLþQD YODNQDLQNDEOL Fibres and cables
SIST EN 60793-1-31:2010 en

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

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SIST EN 60793-1-31:2010
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SIST EN 60793-1-31:2010
EUROPEAN STANDARD
EN 60793-1-31
NORME EUROPÉENNE
September 2010
EUROPÄISCHE NORM
ICS 33.180.10 Supersedes EN 60793-1-31:2002
English version
Optical fibres -
Part 1-31: Measurement methods and test procedures -
Tensile strength
(IEC 60793-1-31:2010)
Fibres optiques - Lichtwellenleiter -
Partie 1-31 : Méthodes de mesure Teil 1-31: Messmethoden
et procédures d’essai - und Prüfverfahren -
Résistance à la traction Zugfestigkeit
(CEI 60793-1-31:2010) (IEC 60793-1-31:2010)

This European Standard was approved by CENELEC on 2010-09-01. CENELEC 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 Central Secretariat or to any CENELEC 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 CENELEC member into its own language and notified

to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,

the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,

Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,

Spain, Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2010 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 60793-1-31:2010 E
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SIST EN 60793-1-31:2010
EN 60793-1-31:2010 - 2 -
Foreword

The text of document 86A/1285/CDV, future edition 2 of IEC 60793-1-31, prepared by SC 86A, Fibres

and cables, of IEC TC 86, Fibre optics, was submitted to the IEC-CENELEC parallel vote and was

approved by CENELEC as EN 60793-1-31 on 2010-09-01.
This European Standard supersedes EN 60793-1-31:2002.

The main change with respect to the previous edition is the addition of comprehensive details, such as

examples of fibre clamping as given in Annexes A, B and C.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent

rights.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2011-06-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2013-09-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice

The text of the International Standard IEC 60793-1-31:2010 was approved by CENELEC as a European

Standard without any modification.

In the official version, for Bibliography, the following note has to be added for the standard indicated:

IEC 61649 NOTE Harmonized as EN 61649.
__________
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SIST EN 60793-1-31:2010
- 3 - EN 60793-1-31:2010
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

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.

NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD

applies.
Publication Year Title EN/HD Year
IEC 60793-1-20 - Optical fibres - EN 60793-1-20 -
Part 1-20: Measurement methods and test
procedures - Fibre geometry
IEC 60793-1-21 - Optical fibres - EN 60793-1-21 -
Part 1-21: Measurement methods and test
procedures - Coating geometry
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SIST EN 60793-1-31:2010
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SIST EN 60793-1-31:2010
IEC 60793-1-31
Edition 2.0 2010-05
INTERNATIONAL
STANDARD
Optical fibres –
Part 1-31: Measurement methods and test procedures – Tensile strength
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
ICS 33.180.10 ISBN 978-2-88910-916-6
® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 7 ----------------------
SIST EN 60793-1-31:2010
– 2 – 60793-1-31 © IEC:2010(E)
CONTENTS

FOREWORD...........................................................................................................................4

INTRODUCTION.....................................................................................................................6

1 Scope...............................................................................................................................7

2 Normative references .......................................................................................................7

3 Apparatus.........................................................................................................................7

3.1 General ...................................................................................................................7

3.2 Gripping the fibre at both ends ................................................................................8

3.3 Sample support .......................................................................................................8

3.4 Stretching the fibre..................................................................................................8

3.5 Measuring the force at failure ..................................................................................9

3.6 Environmental control equipment ............................................................................9

4 Sample preparation ..........................................................................................................9

4.1 Definition.................................................................................................................9

4.2 Sample size and gauge length.................................................................................9

4.3 Auxiliary measurements ........................................................................................10

4.4 Environment ..........................................................................................................11

5 Procedure ......................................................................................................................11

5.1 Preliminary steps...................................................................................................11

5.2 Procedure for a single specimen ...........................................................................11

5.3 Procedure for completing all samples for a given nominal strain rate.....................11

6 Calculations ...................................................................................................................12

6.1 Conversion of tensile load to failure stress ............................................................12

6.2 Preparation of a Weibull plot .................................................................................13

6.3 Computation of Weibull parameters .......................................................................13

7 Results ...........................................................................................................................14

7.1 The following information should be reported for each test: ...................................14

7.2 The following information should be provided for each test:...................................14

8 Specification information ................................................................................................14

Annex A (informative) Typical dynamic testing apparatus.....................................................15

Annex B (informative) Guideline on gripping the fibre...........................................................17

Annex C (informative) Guideline on stress rate ....................................................................21

Bibliography..........................................................................................................................22

Figure 1 – Bimodal tensile strength Weibull plot for a 20 m gauge length test set-up at

5 %/min strain rate................................................................................................................10

Figure A.1 – Capstan design.................................................................................................15

Figure A.2 – Translation test apparatus ................................................................................15

Figure A.3 – Rotating capstan apparatus ..............................................................................16

Figure A.4 – Rotating capstan apparatus for long lengths .....................................................16

Figure B.1 – Gradual slippage ..............................................................................................17

Figure B.2 – Irregular slippage..............................................................................................17

Figure B.3 – Sawtooth slippage ............................................................................................18

Figure B.4 – Acceptable transfer function .............................................................................18

Figure B.5 – Typical capstan.................................................................................................19

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SIST EN 60793-1-31:2010
60793-1-31 © IEC:2010(E) – 3 –

Figure B.6 – Isostatic compression .......................................................................................19

Figure B.7 – Escargot wrap...................................................................................................20

Figure C.1 – System to control stress rate ............................................................................21

Figure C.2 – Time variation of load and loading speed..........................................................21

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SIST EN 60793-1-31:2010
– 4 – 60793-1-31 © IEC:2010(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPTICAL FIBRES –
Part 1-31: Measurement methods and test procedures –
Tensile strength
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 60793-1-31 has been prepared by subcommittee 86A: Fibres and

cables, of IEC technical committee 86: Fibre optics.

This second edition cancels and replaces the first edition published in 2001. This edition

constitutes a technical revision.

The main change with respect to the previous edition is the addition of comprehensive details,

such as examples of fibre clamping as given in Annexes A, B and C.
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SIST EN 60793-1-31:2010
60793-1-31 © IEC:2010(E) – 5 –
The text of this standard is based on the following documents:
CDV Report on voting
86A/1285/CDV 86A/1308/RVC

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts of the IEC 60793-1series, published under the general title Optical fibres –

Measurement methods and test procedures, can be found on the IEC website.

The committee has decided that the contents of this publication will remain unchanged until

the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.
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SIST EN 60793-1-31:2010
– 6 – 60793-1-31 © IEC:2010(E)
INTRODUCTION

Failure stress distributions can be used to predict fibre reliability in different conditions.

IEC/TR 62048 shows mathematically how this can be done. To complete a given reliability

projection, the tests used to characterize a distribution shall be controlled for the following:

• Population of fibre, e.g., coating, manufacturing period, diameter
• Gauge length, i.e., length of section that is tested
• Stress or strain rates
• Testing environment
• Preconditioning or aging treatments
• Sample size

This method measures the strength of optical fibre at a specified constant strain rate. It is a

destructive test, and is not a substitute for prooftesting.

This method is used for those typical optical fibres for which the median fracture stress is

greater than 3,1 GPa (450 kpsi) in 0,5 m gauge lengths at the highest specified strain rate of

25 %/min. For fibres with lower median fracture stress, the conditions herein have not

demonstrated sufficient precision.

Typical testing is conducted on “short lengths”, up to 1 m, or on “long lengths”, from 10 m to

20 m with sample size ranging from 15 to 30.

The test environment and any preconditioning or aging is critical to the outcome of this test.

There is no agreed upon model for extrapolating the results for one environment to another

environment. For failure stress at a given stress or strain rate, however, as the relative

humidity increases, failure stress decreases. Both increases and decreases in the measured

strength distribution parameters have been observed as the result of preconditioning at

elevated temperature and humidity for even a day or two.

This test is based on the theory of fracture mechanics of brittle materials and on the power-

law description of flaw growth (see IEC TR 62048). Although other theories have been

described elsewhere, the fracture mechanics/power-law theory is the most generally accepted.

A typical population consists of fibre that has not been deliberately damaged or

environmentally aged. A typical fibre has a nominal diameter of 125 μm, with a 250 μm or less

nominal diameter acrylate coating. Default conditions are given for such typical populations.

Atypical populations might include alternative coatings, environmentally aged fibre, or

deliberately damaged or abraded fibre. Guidance for atypical populations is also provided.

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SIST EN 60793-1-31:2010
60793-1-31 © IEC:2010(E) – 7 –
OPTICAL FIBRES –
Part 1-31: Measurement methods and test procedures –
Tensile strength
1 Scope

This part of IEC 60793 provides values of the tensile strength of optical fibre samples and

establishes uniform requirements for the mechanical characteristic – tensile strength. The

method tests individual lengths of uncabled and unbundled glass optical fibre. Sections of

fibre are broken with controlled increasing stress or strain that is uniform over the entire fibre

length and cross section. The stress or strain is increased at a nominally constant rate until

breakage occurs.

The distribution of the tensile strength values of a given fibre strongly depends on the sample

length, loading velocity and environmental conditions. The test can be used for inspection

where statistical data on fibre strength is required. Results are reported by means of

statistical quality control distribution. Normally the test is carried out after temperature and

humidity conditioning of the sample. However, in some cases, it may be sufficient to measure

the values at ambient temperature and humidity conditions
This method is applicable to types A1, A2, A3, B and C optical fibres.

Warning – This test involves stretching sections of optical fibre until breakage occurs. Upon

breakage, glass fragments can be distributed in the test area. Protective screens are

recommended. Safety glasses should be worn at all times in the testing area.
2 Normative references

The following referenced documents are indispensable for the application of this document.

For undated references, the latest edition of the referenced document (including any

amendments) applies.

IEC 60793-1-20, Optical fibres – Part 1-20: Measurement methods and test procedures –

Fibre geometry

IEC 60793-1-21, Optical fibres – Part 1-21: Measurement methods and test procedures –

Coating geometry
3 Apparatus
3.1 General

This clause prescribes the fundamental requirements of the equipment used for dynamic

strength testing. There are many configurations that can meet these requirements. Some

examples are presented in Annex A. The choice of a specific configuration will depend on

such factors as:
• gauge length of a specimen
• stress or strain rate range
• environmental conditions
• strength of the specimens.
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