1、BRITISH STANDARD AEROSPACE SERIESBS EN3745-512:2005Fibres and cables, optical, aircraft use Test methods Part 512: Flexure enduranceThe European Standard EN 3745-512:2005 has the status of a British StandardICS 49.060g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54
2、g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 3745-512:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2006 BSI 2006ISBN 0 580 48641 9National forewordTh
3、is British Standard is the official English language version of EN 3745-512:2005. The UK participation in its preparation was entrusted by Technical Committee ACE/6, Aerospace avionic electrical and fibre optic technology, to Subcommittee ACE/6/-/10, Aerospace Fibre optic systems and equipment, whic
4、h has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary.Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the sect
5、ion entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Co
6、mpliance 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 UK interests informed; monitor related
7、international and European developments and promulgate them in the UK.Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page, pages 2 to 6, an inside back cover and a back cover.The BSI copyright notice displayed in this document indicates when the document w
8、as last issued.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 3745-512November 2005ICS 49.060English VersionAerospace series - Fibres and cables, optical, aircraft use - Testmethods - Part 512: Flexure enduranceSrie arospatiale - Fibres et
9、cbles optiques usagearonautique - Mthodes dessais - Partie 512 : Rsistance la flexionLuft- und Raumfahrt - Faseroptische Leitungen frLuftfahrzeuge - Prfverfahren - Teil 512: BiegefestigkeitThis European Standard was approved by CEN on 19 September 2005.CEN members are bound to comply with the CEN/CE
10、NELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any C
11、EN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN memb
12、ers are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and Unite
13、d Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2005 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3745-512:2005: E2
14、 Contents Foreword 3 1 Scope .4 2 Normative references .4 3 Preparation of specimens 4 4 Apparatus 5 5 Method .6 EN 3745-512:20053 Foreword This European Standard (EN 3745-512:2005) has been prepared by the European Association of Aerospace Manufacturers - Standardization (AECMA-STAN). After enquiri
15、es and votes carried out in accordance with the rules of this Association, this Standard has re-ceived the approval of the National Associations and the Official Services of the member countries of AECMA, prior to its presentation to CEN. This European Standard shall be given the status of a nationa
16、l standard, either by publication of an identical text or by endorsement, at the latest by May 2006, and conflicting national standards shall be withdrawn at the latest by May 2006. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights.
17、CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic,
18、Den-mark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxem-bourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 3745-512:20054 1 Scope This standard specifies a method for t
19、esting flexure endurance of the cable when it is subjected to alternating flexing. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated refer-ences, only the edition cited applies. For undated references, the latest edition of th
20、e referenced document (including any amendments) applies. EN 2591-100, Aerospace series Elements of electrical and optical connection Test methods Part 100: General EN 3745-100, Aerospace series Fibres and cables, optical, aircraft use Test methods Part 100: General1)EN 3745-201, Aerospace series Fi
21、bres and cables, optical, aircraft use Test methods Part 201: Visual examination EN 3745-301, Aerospace series Fibres and cables, optical, aircraft use Test methods Part 301: Attenuation3 Preparation of specimens 3.1 The specimen shall be prepared as specified in EN 3745-100. 3.2 The following detai
22、ls shall be specified if not already included in the product standard: type of specimen; number of specimens if different of 3; length if not 1 m; mass M value if not 300 g; diameter D of mandrels if not 20 times the cable diameter; static bend radius; maximum permissible Variation of attenuation; n
23、umber of cycles. 1) In preparation at the date of publication of this standard. EN 3745-512:20055 4 Apparatus The apparatus shall comprise: a Light Launch System (LLS) as defined in EN 2591-100; a Light Detector System (LDS) as defined in EN 2591-100; a test fixture capable of applying the flexure e
24、ndurance test. A typical arrangement is shown in Figure 1 The rotation speed shall be a uniform rate of (18 2) cycles/min with the cable vertical, a cycle is defined by a rotation of 90 left, return to the vertical, rotation of 90 right and return to the vertical. The space between mandrels is equal
25、 to the maximum diameter of the tested cable. The apparatus shall be fitted with a counter. Dimensions in millimetres Key 1 Centre of rotation 2 Mandrels ( D) 3 Cable 4 Mass M 5 Min. static bend radius 6 LDS 7 LLS Figure 1 EN 3745-512:20056 5 Method 5.1 Procedure The attenuation shall be monitored t
26、hroughout the test in accordance with EN 3745-301 method C. Install the specimen on apparatus. Apply the specified load M to optical cable. Perform a preliminary run and if necessary adjust the distance between mandrels and attached load to avoid resonance effects. Connect the end specimen to LLS an
27、d LDS. Zero the LDS to obtain a reference level. Reset the counter. Perform the specified number of cycles. 5.2 Requirements Examine the test specimen for damage in accordance with EN 3745-201: Visual examination. The change in attenuation shall be less than the specified value. EN 3745-512:2005blan
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