1、ASD-STAN STANDARD NORME ASD-STAN ASD-STAN NORM prEN 3745-516 Edition P 2 January 2015 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATION Rue Montoyer 10 - 1000 Brussels - Tel. 32 2 775 8126 - Fax. 32 2 775 8131 - www.asd-stan.org ICS: 49.060 Supersedes edition
2、P 1 of December 2010 and will supersede EN 3745-516:2012 Descriptors: ENGLISH VERSION Aerospace series Fibres and cables, optical, aircraft use Test methods Part 516: Severe cable bend test Srie arospatiale Fibres et cbles optiques usage aronautique Mthodes dessais Partie 516 : Essai de courbure svr
3、e Luft- und Raumfahrt Faseroptische Leitungen fr Luftfahrzeuge Prfverfahren Teil 516: Schwere Kabelbiegeprfung This “Aerospace Series“ Prestandard has been drawn up under the responsibility of ASD-STAN (The AeroSpace and Defence Industries Association of Europe - Standardization). It is published fo
4、r the needs of the European Aerospace Industry. It has been technically approved by the experts of the concerned Domain following member comments. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an extent that interchangeability is affected, physicall
5、y or functionally, without re-identification of the standard. After examination and review by users and formal agreement of ASD-STAN, it will be submitted as a draft European Standard (prEN) to CEN (European Committee for Standardization) for formal vote and transformation to full European Standard
6、(EN). The CEN national members have then to implement the EN at national level by giving the EN the status of a national standard and by withdrawing any national standards conflicting with the EN. Edition approved for publication 1st January 2015 Comments should be sent within six months after the d
7、ate of publication to ASD-STAN Electrical Domain Copyright 2015 by ASD-STAN prEN 3745-516:2015 (E) 2 Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Preparation of specimens . 3 4 Apparatus . 3 5 Method 5 Foreword This standard was reviewed by the Domain Technical Coordinator of ASD-ST
8、ANs Electrical Domain. After inquiries and votes carried out in accordance with the rules of ASD-STAN defined in ASD-STANs General Process Manual, this standard has received approval for Publication. prEN 3745-516:2015 (E) 3 1 Scope This standard specifies a method of checking the break resistance a
9、nd attenuation variation recovery of an optical cable subjected to severe bending under load. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited appli
10、es. For undated references, the latest edition of the 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
11、 Part 100: General EN 3745-201, Aerospace series Fibres 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: Attenuation 3 Preparation of specimens 3.1 If not yet at standard test con
12、ditions, the specimens shall be subjected to standard test conditions and stabilized at these conditions for 24 h as defined in EN 2591-100. Type and length of fibre or cable. Load mass M to be applied to ensure contact between the cable and the edge of the metal bar. Radius(s) R of the bending edge
13、. Number of turns N to rotate the cable 180 after each bend test. 4 Apparatus A Light Launch System (LLS) as defined in EN 2591-100. A Light Detection System (LDS) as defined in EN 2591-100. A flat metal bar with radius edge and loads required by the applicable product standard. A typical arrangemen
14、t is shown in Figure 1. prEN 3745-516:2015 (E) 4 Key 1 Fibre optic cable 2 LLS 3 10 mm to 20 mm thick flat metal bar with radius edge R 4 Typical radius R (0,25 0,01) mm or specified diameter defined in the product standard 5 Clamp 6 Load 7 LDS Figure 1 prEN 3745-516:2015 (E) 5 5 Method 5.1 Procedur
15、e a) Connect the specimen to the LLS and LDS. b) Attach the load mass (M) to the specimen as specified in the applicable product standard prior to mounting the specimen on the bend fixture. c) Zero the LDS to establish a reference measurement. d) Mount the specimen on the bend fixture and gently app
16、ly the load to the specimen. e) After one (1) minute, measure the attenuation variation (EN 3745-301, method C) to ensure no fibre breakage. f) Remove the load from the cable and rotate the cable by 180 and slide the cable by 30 cm not to repeat the next bending at the same location g) Repeat steps
17、d) to f) for the number of rotations required by the applicable product standard. h) Straighten specimen and measure the attenuation variation after one (1) minute. 5.2 Final measurements and requirements Measure the residual attenuation variation (EN 3745-301, method C) after removing the specimen from the test fixture to ensure no fibre breakage. Perform a visual examination according to EN 3745-201.Visual examination
