ASD-STAN PREN 3745-506-2017 Aerospace series Fibres and cables optical aircraft use Test methods Part 506 Impact resistance (Edition P 2).pdf

1、ASD-STAN STANDARD NORME ASD-STAN ASD-STAN NORM ASD-STAN prEN 3745-506 Edition P 2 February 2017 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.orgICS: 49.060 Supers

2、edes edition P 1 of January 2000 and will supersede EN 3745-506:2010 Descriptors: ENGLISH VERSION Aerospace series Fibres and cables, optical, aircraft use Test methods Part 506: Impact resistance Luft- und Raumfahrt Elektrischen Leitungen fr Luftfahrt Verwendung Prfverfahren Teil 506: Schlagfestigk

3、eit Srie arospatiale Cbles lectriques usage aronautique Mthodes dessais Partie 506 : Rsistance limpact 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 for the ne

4、eds 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, physically or fun

5、ctionally, without re-identification of the standard. After examination and review by users and formal agreement of ASD-STAN, the ASD-STAN prEN will be submitted as a draft European Standard (prEN) to CEN (European Committee for Standardization) for formal vote and transformation to full European St

6、andard (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. ASD-STAN Technical Committee approves that: “This document is published by ASD-STAN for the need

7、s of the European Aerospace Industry. The use of this standard is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.” ASD-STAN reviews each standard and technical report at lea

8、st every five years at which time it may be revised, reaffirmed, stabilized or cancelled. ASD-STAN invites you to send your written comments or any suggestions that may arise. All rights reserved. No parts of this publication may be reproduced, stored in a retrieval system or transmitted, in any for

9、m or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of ASD-STAN. Order details: E-mail: salesasd-stan.org Web address: http:/www.asd-stan.org/ Edition approved for publication 1stFebruary 2017 Comments should be sent within six months af

10、ter the date of publication to ASD-STAN Electrical Domain Copyright 2017 ASD-STAN prEN 3745-506:2017 (E) 2 prEN3745-506:2017(E) Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Preparation of specimens 3 4 Apparatus. 4 5 Method 7 Foreword This standard was reviewed by the Domain Technic

11、al Coordinator of ASD-STANs 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 3745-506:2017 (E) 3 prEN3745-506:2017(E) 1 Scope This standard specifie

12、s a method to determine the ability of an optical fibre or cable to withstand impact under specified environmental conditions. 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 referen

13、ces, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 2591-100, Elements of electrical and optical connection Test methods Part 100: General EN 3745-100, Aerospace series Fibres and cables, optical, aircraft

14、use Test methods 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 Fibres coated by UV

15、-curable acrylic resin can be cleaned (e.g. from cable filling compounds), without causing damage to the coating using any cleaning agent recommended by the manufacturer of the fibres. However the use of chlorine-based cleaning agents should be absolutely avoided, since they can attack the coating e

16、ven after their use and in vapour phase. lf not at standard test conditions, the specimens shall be subjected to standard test conditions and stabilized at these conditions for 24 h as defined in EN 3745-100. Attenuation should be measured, in accordance with EN 3745-301 method C, before the test. U

17、nless otherwise specified in the product standard, the following details shall be as stated in the technical specification: a) the temperature at which test is carried out if other than standard; b) the number and length of specimens; c) the mass of the weight and the drop height, or alternatively t

18、he impact energy; d) the radius R of the striking face; e) the number of impacts; f) the permissible change in attenuation after the test; g) location of impacts on the sample (if not at the same location). prEN 3745-506:2017 (E) 4 prEN3745-506:2017(E) 4 Apparatus The test fixture shall allow the tr

19、ansmission of the impact load onto the cable sample which is fixed to a steel baseplate. The test fixtures detailed in Figures 1 and 2 shall be used for single or low numbers of impact testing. Apply a load vertically to the striking face to transmit the impact force onto the cable sample, as shown

20、in Figure 1. The striking face can be fixed directly to the weight as shown in Figure 2. The impact is applied to the cable sample through a striking face with a specific radius R as defined in the product standard. Where more than five (5) impacts are required the test fixture shown in Figure 3 can

21、 be used. The rotary actuator shall be used to raise the freely suspended weight and striking face only. In both cases, other equivalent apparatus may also be used. The apparatus shall comprise: a) a Light Launch System (LLS) and Light Detector System (LDS) as defined in EN 2591-100; b) impact test

22、apparatus as defined: Key 1 Metal plate 2 Cable sample 3 Weight (hammer) 4 Striking face 5 Guide (tube or hole in the frame) 6 Frame Figure 1 Test fixture for limited number of drops prEN 3745-506:2017 (E) 5 prEN3745-506:2017(E) Key 1 Steel plate 2 Chinning bar 3 Guide (tube) 4 Striking face 5 Cable

23、 sample 6 Weight (hammer) Figure 2 Alternative test fixture for limited number of drops prEN 3745-506:2017 (E) 6 prEN3745-506:2017(E) Key 1 Steel plate 2 Striking face 3 Guide (tube for example) 4 Pulley 5 Cable sample 6 Weight (hammer) Figure 3 Test fixture for multiple drops Key 1 Radius R Figure

24、4 Striking face The impact test apparatus shall permit a weight to drop vertically onto a striking face which transmits the impact to the cable sample or directly on the cable sample through, the striking face fixed to the weight (hammer). The sample shall be fixed to a flat substantial steel base.

25、prEN 3745-506:2017 (E) 7 prEN3745-506:2017(E) 5 Method 5.1 Procedure After the cable sample has been mounted in the test apparatus and maintained in the same position with adhesive tape or any fixture device, the attenuation shall be measured as defined in EN 3745-301, method C. The weight and the h

26、eight from which the weight falls shall be as specified in the product standard, or if an impact energy is specified shall be adjusted to give the value of impact energy shown. When the striking face is attached to the weight (hammer), the individual weight of the striking face shall be included in

27、the overall weight to ensure the right impact energy. The impact shall be applied in the same location on the test sample as default option or following specified spacing defined in the product standard. The number of impacts shall be as specified in the product standard. The attenuation shall be measured immediately after the test as defined in EN 3745-301, method C. 5.2 Final measurements and requirements A visual examination shall be carried out as defined in EN 3745-201. The attenuation change shall be less than the specified value.