ASD-STAN PREN 3475-515-2008 Aerospace series Cables electrical aircraft use Test methods Part 515 Crush resistance (Edition P 1)《航空航天系列 航空器用电缆的试验方法 第515部分 抗压扁性 第P1版》.pdf

1、ASD STANDARD NORME ASD ASD NORM prEN 3475-515 Edition P 1 December 2008 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATION Avenue de Tervuren, 270 - B-1150 Brussels - Tel. + 32 2 775 8126 - Fax. + 32 2 763 3565 - www.asd-stan.orgICS: 49.060 Descriptors: ENGLISH

2、 VERSION Aerospace series Cables, electrical, aircraft use Test methods Part 515: Crush resistance Srie arospatiale Cbles lectriques usage aronautique Mthodes dessais Partie 515 : Rsistance lcrasement Luft- und Raumfahrt Elektrische Leitungen fr Luftfahrtverwendung Prfverfahren Teil 515: Querdruckfe

3、stigkeit 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 technically approved by the experts of the

4、 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. After examination and review by users an

5、d 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 at national level by giving the EN the st

6、atus of a national standard and by withdrawing any national standards conflicting with the EN. Edition approved for publication 31 December 2008 Comments should be sent within six months after the date of publication to ASD-STAN Electrical Domain Copyright 2008 by ASD-STAN prEN 3475-515:20082 Conten

7、ts Page Foreword2 1 Scope 3 2 Normative references 3 3 Preparation of specimens.3 4 Tests conditions 3 5 Apparatus .4 6 Method 4 Foreword This standard was reviewed by the Domain Technical Coordinator of ASD-STANs Electrical Domain. After inquiries and votes carried out in accordance with the rules

8、of ASD-STAN defined in ASD-STANs General Process Manual, this standard has received approval for Publication. prEN 3475-515:2008 3 1 Scope This standard specifies a method to determine the ability of an electrical cable to withstand crushing under specified environmental conditions (e.i. during main

9、tenance operations). It shall be 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 docume

10、nt (including any amendments) applies. EN 3475-100, Aerospace series Cables, electrical, aircraft use Test methods Part 100: General. EN 3475-201, Aerospace series Cables, electrical, aircraft use Test methods Part 201: Visual examination. EN 3475-805, Aerospace series Cables, electrical, aircraft u

11、se Test methods Part 805: Characteristic impedance. EN 3475-806, Aerospace series Cables, electrical, aircraft use Test methods Part 806: Attenuation. EN 3475-812, Aerospace series Cables, electrical, aircraft use Test methods Part 812: Return loss (VSWR). 1)3 Preparation of specimens Connectors sha

12、ll be fitted on each end of the test specimens (coaxial cables) to be connected to the measuring device. Length of specimens: 2 m, unless otherwise defined in product standard. 4 Tests conditions Unless otherwise specified in the product standard, the following test conditions shall be applied: Temp

13、erature at which test is carried out = 20 C; Number of specimens: 3. 1) Published as ASD Prestandard at the date of publication of the present standard. prEN 3475-515:2008 4 The following requirements shall be specified in the product standard: the frequency band of the measurements (DC up to the ma

14、ximum frequency of the standard if not specified otherwise); the compressive force to be applied; The duration of the application of the load. 5 Apparatus The apparatus shall allow a sample to be crushed between a flat steel base plate and a movable steel plate which applies gradually, by any conven

15、ient method, the crushing force uniformly over a 100 mm length of the sample. The plates shall be suitably radiused to prevent sharp edges digging into the specimen Suitable apparatus is shown in Figure 1. (Dimensions in millimetres) Top view End view Key 1 Guide 2 Load 3 Specimen R = minimum bend r

16、adius as defined in the product standard of the cable under test. Figure 1 Test methods 6 Method 6.1 Measurements Measurements, at specified frequency band, shall be performed according to their specific test standards, for: EN 3475-805: Characteristic impedance; EN 3475-806: Attenuation; EN 3475-81

17、2: Return loss. 100 prEN 3475-515:20085 6.2 Test procedure Place the specimen in the test fixture. Step 1 : With no load applied, obtain the initial measurement for each test. Step 2 : The load shall be applied at a constant rate of loading as specified in the product standard until the required app

18、lied load is obtained. Step 3 : The load shall be maintained for the specified period. Step 4 : Remove the load. Step 5 : When the load has been fully removed allow the specimen to recover for 15 min. The variation of the return loss (EN 3475-812), shall be monitored continuously throughout the test

19、. 6.3 Final measurements Step 1 : the following tests should be carried out: EN 3475-201: Visual examination EN 3475-805: Characteristic impedance; EN 3475-806: Attenuation; EN 3475-812: Return loss. 6.4 Requirements Characteristic impedance, attenuation and return loss, before (step 1) and after (step 5) test shall be within the requirements of the product standard. The return loss values during the test (step 3 and step 4) shall be recorded.