1、BRITISH STANDARD BS EN 60793-1-33: 2002 IEC 60793-1-33: 2001 Optical fibres Part 1-33: Measurement methods and test procedures Stress corrosion susceptibility The European Standard EN 60793-1-33:2002 has the status of a British Standard ICS 33.180.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMI
2、TTED BY COPYRIGHT LAWBS EN 60793-1-33:2002 This British Standard, having been prepared under the direction of the Electrotechnical Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 16 May 2002 BSI 16 May 2002 ISBN 0 580 39618 5
3、National foreword This British Standard is the official English language version of EN 60793-1-33:2002. It is identical with IEC 60793-1-33:2001. The UK participation in its preparation was entrusted by Technical Committee GEL/86, Fibre optics, to Subcommittee GEL/86/1, Optical fibres and cables, wh
4、ich has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. From 1 January 1997, all IEC publications have the number 60000 added to the old number. For instance, IEC 27-1 has been renumbered as IEC 60027-1. For a period of tim
5、e during the change over from one numbering system to the other, publications may contain identifiers from both systems. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the se
6、ction entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct applicatio
7、n. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor
8、 related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 38, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the
9、 document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD EN 60793-1-33 NORME EUROPENNE EUROPISCHE NORM April 2002 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elekt
10、rotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60793-1-33:2002 E ICS 33.180.10 English version Optical fibres Part 1-33: Measurement methods and
11、 test procedures - Stress corrosion susceptibility (IEC 60793-1-33:2001) Fibres optiques Partie 1-33: Mthodes de mesure et procdures dessai - Rsistance la corrosion sous contrainte (CEI 60793-1-33:2001) Lichtwellenleiter Teil 1-33: Messmethoden und Prfverfahren - Spannungskorrosionsempfindlichkeit (
12、IEC 60793-1-33:2001) This European Standard was approved by CENELEC on 2002-03-05. 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
13、 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 res
14、ponsibility 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, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, I
15、taly, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.Foreword The text of document 86A/688/FDIS, future edition 1 of IEC 60793-1-33, prepared by SC 86A, Fibres and cables, of IEC TC 86, Fibre optics, was submitted to the IEC-CENELEC parallel vote and
16、was approved by CENELEC as EN 60793-1-33 on 2002-03-05. 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) 2002-12-01 latest date by which the national standards conflicting with
17、 the EN have to be withdrawn (dow) 2005-03-01 Annexes designated “normative“ are part of the body of the standard. Annexes designated “informative“ are given for information only. In this standard, annexes A, B, C, D, E and ZA are normative and annexes F, G and H are informative. Annex ZA has been a
18、dded by CENELEC. Compared to IEC 60793-1:1989 and IEC 60793-2:1992, IEC/SC 86A has adopted a revised structure of the new IEC 60793 series: The individual measurement methods and test procedures for optical fibres are published as “Part 1-XX“; the product standards are published as “Part 2-XX“. The
19、general relationship between the new series of EN 60793 and the superseded European Standards of the EN 188000 series is as follows: EN Title supersedes EN 60793-1-XX Optical fibres - Part 1-XX: Measurement methods and test procedures Individual subclauses of EN 188000:1992 EN 60793-2-XX Optical fib
20、res - Part 2-XX: Product specifications EN 188100:1995 EN 188101:1995 EN 188102:1995 EN 188200:1995 EN 188201:1995 EN 188202:1995 EN 60793-1-3X consists of the following parts, under the general title: Optical fibres: - Part 1-30: Measurement methods and test procedures Fibre proof test - Part 1-31:
21、 Measurement methods and test procedures Tensile strength - Part 1-32: Measurement methods and test procedures Coating strippability - Part 1-33: Measurement methods and test procedures Stress corrosion susceptibility - Part 1-34: Measurement methods and test procedures Fibre curl _ Endorsement noti
22、ce The text of the International Standard IEC 60793-1-33:2001 was approved by CENELEC as a European Standard without any modification. _ Page2 EN60793133:2002 BSI16May2002067-39-133 I EC:2001 3 CONTENTS INTRODUCTION.4 1 Scope and object5 2 Normative references .5 3 Apparatus.6 4 Sampling and specime
23、ns6 5 Reference test method .6 6 Procedure.7 7 Calculations .7 8 Results.7 9 Specification information 7 Annex A (normative) Dynamic n value by axial tension 8 Annex B (normative) Dynamic n value by two-point bending 15 Annex C (normative) Static n value by axial tension.20 Annex D (normative) Stati
24、c n value by two-point bending.23 Annex E (normative) Static n value by uniform bending25 Annex F (informative) Considerations for dynamic fatigue calculations 28 Annex G (informative) Considerations for static fatigue calculations 32 Annex H (informative) Considerations on stress corrosion suscepti
25、bility parameter test methods.33 Annex ZA (normative) Normative references to international publications with their corresponding European publications 38 Bibliography37 Figure A.1 Schematic of translation test apparatus 8 Figure A.2 Schematic of rotational test apparatus 9 Figure A.3 Schematic of r
26、otational test apparatus with load cell.9 Figure A.4 Representation of dynamic fatigue graph 14 Figure B.1 Schematic of two-point bending unit18 Figure B.2 Schematic of surface platen19 Figure B.3 Dynamic fatigue data schematic19 Figure C.1 Schematic of possible static fatigue (tension) apparatus.22
27、 Figure D.1 Schematic of possible static fatigue (two-point bending) apparatus 24 Figure E.1 Schematic of possible static fatigue (uniform bending) apparatus .27 Figure H.1 The results of the round robin fracture strength versus time36 Figure H.2 The results of the round robin fracture strength vers
28、us time36 Table F.1 95 % confidence interval for n d .29 Page3 EN60793133:2002 BSI16May2002067-39-133 I EC:2001 4 INTRODUCTION Publications in the IEC 60793-1 series concern measurement methods and test procedures as they apply to optical fibres. Within the same series several different areas are gr
29、ouped, as follows: parts 1-10 to 1-19: General parts 1-20 to 1-29: Measurement methods and test procedures for dimensions parts 1-30 to 1-39: Measurement methods and test procedures for mechanical charac- teristics parts 1-40 to 1-49: Measurement methods and test procedures for transmission and opti
30、cal characteristics parts 1-50 to 1-59: Measurement methods and test procedures for environmental charac- teristics. Page4 EN60793133:2002 BSI16May2002067-39-133 I EC:2001 5 OPTICAL FIBRES Part 1-33: Measurement methods and test procedures Stress corrosion susceptibility 1 Scope and object This part
31、 of IEC 60793 contains descriptions of the five main test methods concerning the determination of stress corrosion susceptibility parameters. The object of this standard is to establish uniform requirements for the mechanical characteristic stress corrosion susceptibility. Dynamic fatigue and static
32、 fatigue tests are used in practice to determine stress corrosion susceptibility parameters, dynamic n-value and static n-value. Any fibre mechanical test should determine fracture stress and fatigue properties under conditions that model the practical application as close as possible. Some appropri
33、ate test methods are available: A : D y n a m i c n value by axial tension (see annex A); B : D y n a m i c n value by two-point bending (see annex B); C : S t a t i c n value by axial tension (see annex C); D : S t a t i c n value by two-point bending (see annex D); E : S t a t i c n value by unifo
34、rm bending (see annex E). These methods are appropriate for types A1, A2 and A3 multimode and type B1 single-mode fibres. Static and dynamic fatigue test methods show comparable results if both tests are performed in the same effective measuring time. For dynamic fatigue tests this means a measuring
35、 time which is (n + 1) times larger than the measuring time of static fatigue tests. When using static fatigue test methods, it has been observed that for longer measuring times and consequently lower applied stress levels, the n-value increases. The range of measuring times of the static fatigue te
36、sts, given in this standard, approaches the practical situation better than that of the dynamic fatigue tests, which in general are performed in relatively short time-frames. These tests provide values of the stress corrosion parameter, n, that can be used for reliability calculations according to I
37、EC 62048. 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. IEC 62048, The l
38、aw theory of optical fibre reliability 1 _ 1To be published. Page5 EN60793133:2002 BSI16May2002067-39-133 I EC:2001 6 3 Apparatus See annexes A, B, C, D, and E for each of the layout drawings and other equipment requirements for each of the methods respectively. 4 Sampling and specimens These measur
39、ements are statistical in nature. A number of specimens or samples from a common population are tested, each under several conditions. Failure stress or time statistics for various sampling groups are used to calculate the stress corrosion susceptibility parameters. 4.1 Specimen length Specimen leng
40、th is contingent on the test procedure used. See the respective annexes A, B, C, D and E for the length required for the test method. For tensile tests, the length ranges from 0,5 m to at most 5 m. For two-point bending tests, the actual length tested is less than 1 cm and for uniform bending tests
41、about 1 m. 4.2 Specimen preparation and conditioning All of the test methods shall be performed under constant environmental conditions. Unless otherwise specified in the detail specification, the nominal temperature shall be in the range of 20 C to 23 C with a tolerance of 2 C for the duration of t
42、he test. Unless otherwise specified in the detail specification, the nominal relative humidity (RH) shall be in the range of 40 % to 60 % with a tolerance of 5 % for the duration of the test. Unless otherwise specified, all specimens shall be pre-conditioned in the test environment for a minimum per
43、iod of 12 h. The use of stress corrosion susceptibility (and proof stress) parameters for reliability estimates is still under consideration. A method for extrapolating such parameters to service environments different from the default environment specified above has not been developed. It has been
44、observed that the value of n produced by these tests can change after even brief exposure of the fibre to elevated temperature and humidity. A guide for the use of these methods is documented in IEC 62048. The observed value of stress corrosion susceptibility parameter, n, may differ between fatigue
45、 test methods. Influences on the results have been observed concerning the measuring time and the applied stress level. Care should be taken in the choice of test method. This should be agreed between the user and manufacturer. 5 Reference test method Method A is the reference test method and shall
46、be used to resolve disputes because it yields minimal values compared to the others and may be completed in a duration practical for dispute resolution. Page6 EN60793133:2002 BSI16May2002067-39-133 I EC:2001 7 6 Procedure See annexes A, B, C, D and E, respectively, for the individual test methods. E
47、ach of several samples (consisting of a number of specimens) is exposed to one of a number of stress conditions. For static fatigue tests, a constant stress is applied from sample to sample and time to failure is measured. For dynamic fatigue tests, the stress rate is varied from sample to sample an
48、d the failure stress is measured. The following is an overview of the procedures common to all methods: complete pre-conditioning; divide the specimens into sample groups; apply the specified stress conditions to each sample group; measure time or stress at failure; complete calculations 7 Calculati
49、ons The calculations for each individual test method are found respectively in annexes A, B, C, D and E. 8 Results 8.1 The following information shall be reported with each test: fibre identification; t e s t d a t e ; stress corrosion susceptibility parameter; test method. 8.2 The following information shall be provided upon request: specific information as required by the test method;
