ASD-STAN PREN 3475-704-2006 Aerospace series Cables electrical aircraft use Test methods Part 704 Flexibility (Edition P 2)《航空航天系列 航空器用电缆的试验方法 第704部分 揉曲性 第P2版》.pdf

1、ASD STANDARD NORME ASD ASD NORM prEN 3475-704 Edition P 2 October 2006 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATION Gulledelle 94 - B-1200 Brussels - Tel. + 32 2 775 8126 - Fax. + 32 2 763 3565 - www.asd-stan.orgICS: 49.060 Supersedes edition P 1 of Octob

2、er 1997 and will supersede EN 3475-704:2002 Descriptors: ENGLISH VERSION Aerospace series Cables, electrical, aircraft use Test methods Part 704: Flexibility Srie arospatiale Cbles lectriques usage aronautique Mthodes dessais Partie 704 : Flexibilit Luft- und Raumfahrt Elektrische Leitungen fr Luftf

3、ahrtverwendung Prfverfahren Teil 704: Biegsamkeit 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 needs of the European Aerospace Industry. It has been t

4、echnically 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 functionally, without re-identification of the standard.

5、 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 (EN). The CEN national members have then to implement the EN

6、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 31 October 2006 Comments should be sent within six months after the date of publication to ASD-STAN Electrical Domain Copyright 200

7、6 by ASD-STAN prEN 3475-704:20062 Contents Page Foreword2 1 Scope 3 2 Normative references 3 3 Test Procedures.3 3.1 Method 1 (applicable for cable sizes larger than 5 mm2(10 AWG) .3 3.2 Method 2 (applicable for cable sizes not larger than 5 mm2(10 AWG).5 Foreword This standard was reviewed by the D

8、omain Technical 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 3475-704:20063 1 Scope This standard specifies two methods

9、 for appraising the flexibility of a completed cable and its bending aptitude, Method 1 is for cables not less than 5 mm2cross-section cables and Method 2 for cables not larger than 5 mm2(10 AWG) cross-section cables. Unless otherwise specified in the product standard, Method 1 applies. It shall be

10、used together with EN 3475-100. 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) app

11、lies. EN 3475-100, Aerospace series Cables, electrical, aircraft use Test methods Part 100: General. 3 Test Procedures 3.1 Method 1 (applicable for cable sizes larger than 5 mm2(10 AWG) 3.1.1 Preparation of specimens Sufficiently long test specimen shall be sampled from a completed cable and, after

12、appropriate forming, shall undergo a compression crushing test performed with an appropriate machine. For each test specimen, forming shall consist in making a loop of a diameter equal to 40 times the maximum diameter of the cable. The loop shall be made in the normal cable winding direction. The tw

13、o ends shall be stripped over 5 mm and placed together, then soldered with tin or spliced. Key 1 Dm = maximum diameter of the cable 2 Solder or splice Necessary length: 40 Dm = 125,7 Dm Figure 1 Test specimen forming prEN 3475-704:20064 3.1.2 Apparatus The set-up shall comply with the specifications

14、 stipulated below and shall consist of a device designed crush the loop, preferably in the vertical direction, over a height 10 times the maximum diameter of the cable (25 % of the loop diameter) at a 100 mm/min speed. This device shall be fitted with a recording system. Key 1 Retaining notch 2 Posi

15、tion of loop connection Figure 2 Test mounting 3.1.3 Procedure This test shall be performed at ambient temperature. A test specimen shall be put in the crushing device with the loop junction point in contact with the support. Then, the test specimen shall be subjected to a gradual force F. 3.1.4 Req

16、uirements The force F applied to crush the loop 25 % shall be less than the value specified in the product standard. prEN 3475-704:2006 5 3.2 Method 2 (applicable for cable sizes not larger than 5 mm2(10 AWG) 3.2.1 Preparation of specimens Cut the cable specimens, each approximately 200 mm long, con

17、secutively from the same coil. The specimens shall be straightened by hand or when specified in the individual cable specification, hang each specimen vertically for 24 hours in an oven with the mass specified in Table 1 attached to its free end. The oven temperature is be as stated in the individua

18、l cable specification but shall not exceed the cables maximum rated temperature. After straightening the specimen test shall be performed within 1 hour at an ambient temperature (20 C 5 C). 3.2.2 Apparatus The apparatus shall consist of a device, shown in Figure 3, designed to examine the bending at

19、titude. Dimensions in mm5 1 3 2 4 Key 1 Clamp 2 Mandrel 3 Specimen 4 Recoil 5 Mass container Figure 3 Method 2, Test apparatus prEN 3475-704:20066 3.2.3 Procedure Test the specimens using the rig shown in Figure 3, the diameter of the mandrel in the test rig being that specified in Table 1. Graduall

20、y apply a mass to the cable at the position shown in Figure 1 sufficient to bend the cable downwards through (90 ). Ensure that the specimen remains in this position for 5 min and record the mass. After this time, remove the mass and allow the specimen to recoil towards its original position. At a t

21、ime 5 min after removal of the mass, record the recoil distance. 10Table 1 Cable size Mandrel diameter Straightening load Code nearest AWG mm N 001 26 15 5 002 24 15 7 004 22 15 10 006 20 15 15 010 18 25 20 012 16 25 25 020 14 25 30 030 12 25 40 050 10 50 50 3.2.4 Requirements The mass required to bend the cable through (90 ) and the recoil angle shall not exceed the values stated in the individual cable specification. 10