1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationFibre optic interconnectingdevices and passive components Basic test andmeasurement proceduresPart 2-24: Tests Screen testing of ceramic alignment split sleeve by stress applicat
2、ionBS EN 61300-2-24:2010National forewordThis British Standard is the UK implementation of EN 61300-2-24:2010. It isidentical to IEC 61300-2-24:2010. It supersedes BS EN 61300-2-24:2000which is withdrawn.The UK participation in its preparation was entrusted by Technical CommitteeGEL/86, Fibre optics
3、, to Subcommittee GEL/86/2, Fibre optic interconnectingdevices and passive components.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions of acontract. Users are responsible for its
4、 correct application. BSI 2010ISBN 978 0 580 63662 2ICS 33.180.20Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of the StandardsPolicy and Strategy Committee on 31 August 2010.Amendments issued since publication
5、Amd. No. Date Text affectedBRITISH STANDARDBS EN 61300-2-24:2010EUROPEAN STANDARD EN 61300-2-24 NORME EUROPENNE EUROPISCHE NORM July 2010 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung M
6、anagement 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 61300-2-24:2010 E ICS 33.180.20 Supersedes EN 61300-2-24:2000English version Fibre optic interconnecting devices and passiv
7、e components - Basic test and measurement procedures - Part 2-24: Tests - Screen testing of ceramic alignment split sleeve by stress application (IEC 61300-2-24:2010) Dispositifs dinterconnexion et composantspassifs fibres optiques - Mthodes fondamentales dessais et de mesures - Partie 2-24: Essais
8、- Essai de slection du manchon fendu dalignement en cramique par lapplication de contrainte (CEI 61300-2-24:2010) Lichtwellenleiter -Verbindungselemente und passive Bauteile - Grundlegende Prf- und Messverfahren - Teil 2-24: Prfungen - Sortierprfung keramischer Zentrierhlsen mit Beanspruchung (IEC 6
9、1300-2-24:2010) This European Standard was approved by CENELEC on 2010-07-01. 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
10、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 responsi
11、bility 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, G
12、ermany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 61300-2-24:2010EN 61300-2-24:2010 - 2 - Foreword The text of document 86B/2967/FDIS
13、, future edition 2 of IEC 61300-2-24, prepared by SC 86B, Fibre optic interconnecting devices and passive components, of IEC TC 86, Fibre optics, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61300-2-24 on 2010-07-01. This European Standard supersedes EN 61300-2-24
14、:2000. EN 61300-2-24:2010 constitutes a technical revision. Specific technical changes involve the addition of a dimension example of the reference gauge and the plate for the ceramic sleeve and a commonly used ceramic alignment sleeve for the 1,25 mm ceramic sleeve. Attention is drawn to the possib
15、ility 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
16、identical national standard or by endorsement (dop) 2011-04-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2011-07-01 _ Endorsement notice The text of the International Standard IEC 61300-2-24:2010 was approved by CENELEC as a European Standard with
17、out any modification. _ BS EN 61300-2-24:2010 2 61300-2-24 IEC:2010(E) CONTENTS 1 Scope.5 2 General description 5 3 Apparatus.5 4 Procedure 7 5 Details to be specified 7 Annex A (informative) Static fatigue for zirconia alignment sleeve8 Bibliography15 Figure 1 Apparatus used for screen testing of a
18、 ceramic alignment sleeve.6 Figure A.1 Model of time-varying proof stress for a zirconia sleeve 10 Figure A.2 Calculated contour lines of gauge retention force and working stress along with inner and outer diameter of a zirconia sleeve .11 Figure A.3 Calculated general relationship between p/a and t
19、e, satisfying 0,1 FIT for 20 years use12 Figure A.4 Calculated failure probability of screened zirconia sleeves along with working time .12 Figure A.5 Measured and calculated strength distribution of 2,5 mm zirconia sleeves (comparison between sleeves, extended proof tested or not) 13 Figure A.6 Mea
20、sured strength distribution of 1,25 mm zirconia sleeves (comparison between sleeves, extended proof tested or not) 14 Table 1 Dimension example of the reference gauge and the plate for the ceramic sleeve.6 Table 2 Dimension example of a commonly used ceramic alignment sleeve.7 Table A.1 Measured sta
21、tic fatigue parameters for zirconia sleeves 11 BS EN 61300-2-24:201061300-2-24 IEC:2010(E) 5 FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE COMPONENTS BASIC TEST AND MEASUREMENT PROCEDURES Part 2-24: Tests Screen testing of ceramic alignment split sleeve by stress application 1 Scope The purpose of
22、 this part of IEC 61300 is to identify weaknesses in a ceramic alignment split sleeve which could lead to early failure of the component. 2 General description Ceramic alignment sleeves are important components often used in the adaptor of plug-adaptor-plug optical connector sets. By using the metho
23、d described, the component is subjected to a proof stress greater than would be experienced under normal service conditions. This enables weak products to be screened out. 3 Apparatus The apparatus and arrangement necessary to perform this screening procedure are shown in Figure 1. The material need
24、ed consists of the following: a) a reference gauge made of ceramic with a sleeve-holding section, a tapered section and a stress-applying section. The diameter of each section is dependent on the dimensions of the product being screened. The length of the sleeve-holding section and the stress-applyi
25、ng section should be greater than the component being tested; b) plates A and B, each having a clearance hole in the centre to allow the plate to move a sample of a ceramic alignment split sleeve on the reference gauge. BS EN 61300-2-24:2010 6 61300-2-24 IEC:2010(E) Figure 1b Plate A and plate BSlee
26、ve holding sectionStress applying sectionTapered sectionFixed sectionAB C DHFigure 1a Reference gauge E G FIEC 1487/99IEC 1488/99Figure 1 Apparatus used for screen testing of a ceramic alignment sleeve Table 1 shows the dimension of the reference gauge and the plate for the ceramic split sleeve. A d
27、imension of the stress-applying section diameter (E) is shown for a commonly used ceramic alignment sleeve in Table 2. Table 1 Dimension example of the reference gauge and the plate for the ceramic sleeve Reference For 1,25 mm gauge Dimension mm For 2,5 mm gauge Dimension mm Notes A 9 14 NOTE 2B 5 5
28、 C 9 14 NOTE 2D NOTE 1E 1,259 0 0,000 5 2,515 F NOTE3 G 20 20 H 2 2 NOTE 1 This diameter should be less than the inner diameter of the split sleeve. NOTE 2 Surface finish in this area Ra = 0,2 m. NOTE 3 Dimension F should be greater than dimension E, and less than sleeve D.BS EN 61300-2-24:201061300
29、-2-24 IEC:2010(E) 7 Table 2 Dimension example of a commonly used ceramic alignment sleeve Items For 1,25 mm Dimension mm For 2,5 mm Dimension mm Length 6,8 10,1 Outer diameter 1,62 3,2 Inner diameter (ref.) 1,246 2,49 Split section width 6,8 10,1 4 Procedure This test should be carried out under a 2
30、3 C 2 C environmental temperature condition. The procedure is as follows. a) Insert plate A into the reference gauge and set it at the fixed end of the reference gauge. b) Moisten the inside surface of a ceramic split sleeve sample with distilled water (for example using a cotton bud). Only touch th
31、e sleeve with suitable tools. c) The sample sleeve is inserted onto the sleeve-holding part and set just in front of the tapered part of the reference gauge. d) Insert plate B into the left-hand side of the sample sleeve and move the sample sleeve onto the stress-applying part until the sample sleev
32、e touches plate A (within approximately 1 s). e) The sample sleeve should be held for 3 s under the stressed state. f) After 3 s, stress applied to the sample sleeve is removed by moving plate A to the left-hand side (within approximately 1 s). g) In the course of the procedure from d) to f), sample
33、s without damage (breakage or crack) should be selected as acceptable sleeves. 5 Details to be specified The following details shall be specified depending on the sample sleeve size in the detail specification: diameter of sleeve-holding part of reference gauge (D); diameter of stress-applying part
34、of reference gauge (E); length of sleeve-holding part (A) and stress-applying part (C); diameter of the center hole of plates A and B (F); deviations from test procedure. BS EN 61300-2-24:2010 8 61300-2-24 IEC:2010(E) Annex A (informative) Static fatigue for zirconia alignment sleeve A.1 Prediction
35、of failure probability by static fatigue This annex applies primarily to 2,5 mm zirconia alignment sleeves supported by references 1 to 51). For 1,25 mm zirconia sleeves, a comprehensive analysis is referenced 6 and the strength distribution is shown in Figure A.6. Micro-cracks essentially exist on
36、the surface or inside of ceramics. Therefore, fracture due to static fatigue occurs in ceramics under lower stress than the characteristic strength of the materials because of crack propagation in ceramic materials 1 2. Assurance of reliable optical fibre connections requires the prediction of failu
37、re probability of the zirconia sleeves under working stress needed to align the ferrules. Assuming aligned ferrules of optical connectors, the zirconia sleeves are allowed to stand under a constant stress, as working stress a. Based on the theories of Weibull statistics and slow crack growth for bri
38、ttle materials, cumulative failure probability F of the zirconia sleeves suffering from working stress is given by the following equation: lnln111ln +=aNatNmF(A.1) with 2)(/0eNmmV )2(2)2(2NICKAYN where tais the working time during which the working stress ais applied; m, Veand 0are the Weibull modul
39、us, effective volume, and normalization constant to express the failure probability by the Weibull statistics theory, respectively; Y is the geometry constant; KICis the critical stress intensity factor; A and N are crack propagation constants of the brittle materials 2. 1)Figures in square brackets
40、 refer to the Bibliography. BS EN 61300-2-24:201061300-2-24 IEC:2010(E) 9 These crack propagation constants depend on environmental conditions such as temperature, humidity, atmosphere, and material characteristics. Therefore, if m, N and values are estimated, the static fatigue life time of sleeves
41、 is predicted. The N value is estimated by the dynamic fatigue test that measures the strength of a sleeve corresponding variable of the proportional increased stress coefficient in MPa/s. On the other hand, the relationship between F, strength fof sleeves and is given by executing the sleeve destru
42、ctive test. The slope m and the intercept ln are estimated from equation (A.2). ln)1(ln11ln)2/(1)1/()1(+=+NNNfNmF(A.2) A.2 Reliability improvement by proof test In order to improve the reliability of the zirconia sleeve against fracture due to static fatigue, a proof test that initially eliminates w
43、eak zirconia sleeves by applying a greater stress (called proof stress) than the working stress is effective. Fatigue also occurs under the proof stress. However, the proof test conditions should be decided in order to take into consideration fatigue during the proof test 3 4. When the proof test is
44、 performed, the proof stress papplied to the zirconia changes trapezoidally along with time as shown in Figure A.1. In this figure, stress change is defined as follows: 0 t tl : (t) = t tl t tl+tp : (t) = ptl+tp t tl+tp+tu : (t) = p-t where = p/ tl= p/ tuThe cumulative failure probability Frafter pr
45、oof testing is given by equation (A.3): () lnln11ln)2/(/)2()2()22)/(+=+mNmmNNNNatNarppppF(A.3) with )2/(1 ppNeNpt mNpNpp)2/(1)2/(1 BS EN 61300-2-24:2010 10 61300-2-24 IEC:2010(E) )2/(0pNmpmepV 1+plupeNtttt where Npand pare N and value under the proof test environment, respectively. tup0 Test timetpt
46、lProofstressIEC 1489/99Figure A.1 Model of time-varying proof stress for a zirconia sleeve A.3 Method of proof test A.3.1 Stress design for zirconia alignment sleeve Figure A.2 shows calculated contour lines of the gauge retention force frand working stress aalong with inner and outer diameters of a
47、 zirconia sleeve. Modelling the zirconia sleeve as a curved beam, the gripping force and the working stress are calculated analytically. In calculation, length, maximum static frictional coefficient and Youngs modulus of the zirconia sleeve are 11,4 mm, 0,1 and 196 GPa, respectively. Considering ope
48、rational difficulty and a low yield rate in proof testing, proof stress shall be kept as small as possible. For example, as the maximum gauge retention force and the maximum working stress satisfies the above-mentioned condition and the safety coefficient of around 10 against zirconia characteristic strength of 1 200 MPa respectively, the outer diameter of zirconia sleeve is designed with a value of 3,2 mm. From Figure A.2, the maximum working stress with a 3,2 mm outer diameter becomes 130 MPa (gauge retention force is 3,9 N, inner diameter is 2,
