1、ASD STANDARD NORME ASD ASD NORM prEN 3475-505 Edition P 3 April 2010 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATIONAvenue de Tervuren, 270 - B-1150 Brussels - Tel. 32 2 775 8126 - Fax. 32 2 775 8131 - www.asd-stan.orgICS: Supersedes edition P 2 of September
2、 2006 and will supersede EN 3475-505:2007 Descriptors: ENGLISH VERSION Aerospace series Cables, electrical, aircraft use Test methods Part 505: Tensile test on conductors and strands Srie arospatiale Cbles lectriques usage aronautique Mthodes dessais Partie 505 : Rsistance la traction des conducteur
3、s et des brins Luft- und Raumfahrt Elektrische Leitungen fr Luftfahrtverwendung Prfverfahren Teil 505: Zugfestigkeit der Einzeldrhte und Leiterseile This “Aerospace Series“ Prestandard has been drawn up under the responsibility of ASD-STAN (The AeroSpace and Defence Industries Association of Europe
4、- Standardization). It is published for 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 int
5、erchangeability is affected, physically 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 tra
6、nsformation to full European Standard (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 30 April 2010 Comments should be
7、 sent within six months after the date of publication to ASD-STAN Electrical Domain Copyright 2010 by ASD-STAN prEN 3475-505:2010 (E) 2 Contents Page Foreword2 1 Scope 3 2 Normative references 3 3 Terms and definitions .3 4 Apparatus .4 5 Method 4 5.1 Strands4 5.2 Conductors.4 6 Requirements.4 Annex
8、 A (normative) Test method: Braid strength measured after separation from finished cable .5 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 of ASD-STAN defined in ASD-STANs Gene
9、ral Process Manual, this standard has received approval for Publication. prEN 3475-505:2010 (E) 3 1 Scope This standard specifies a method of measuring the tensile properties of strands, conductors and braids. When required, it can be used also on cables. It shall be used together with EN 3475-100.
10、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) applies. EN 3475-100, Aerospace ser
11、ies Cables, electrical, aircraft use Test methods Part 100: General 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 ultimate tensile strength or tensile strength at break the ultimate tensile strength also called the tensile strength at break
12、 of a material is the limit stress at which the material actually breaks, with sudden release of the stored elastic energy (released as noise and/or heat and/or more cracks e.g. for brittle materials). This point is the fracture marked X on the curve below. (see Figure 1). Figure 1 3.2 ultimate elon
13、gation or elongation at break the ultimate elongation also called elongation at break is the elongation of material at rupture under tensile loading 3.3 elastic limit or yield strength offset yield strength or conventional elastic limit the elastic limit also called yield strength is the maximum str
14、ess that can be developed in a material without causing plastic deformation. It is the stress at which a material start to exhibit a permanent deformation and is a practical approximation of elastic limit. Stress Strain Fracture Plastic regionX Elastic region prEN 3475-505:2010 (E) 4 Offset yield st
15、rength also called Conventional elastic limit is determined from a stress-strain diagram. It is the stress corresponding to the intersection of the stress-strain curve, and a line parallel to its straight line portion offset by a specified strain. Offset for metals are specified as 0,2 % (Rp0,2%), i
16、.e., the intersection of the offset line and the 0-stress axis is at 0,2 % strain. (see Figure 2). Figure 2 4 Apparatus The test shall be carried out with the aid of a tensile tester capable of measuring the specified elongation with an accuracy of 1 %. The pulling speed shall be (50 10) mm/min. The
17、 initial length of the test specimen between the joints shall be (200 5) mm. For tensile strength of braids, see Annex A (normative). 5 Method 5.1 Strands Measure three strands per size, taken from the complete conductor except for: copper alloy sizes 0,15 mm2and 0,25 mm2; and aluminium or copper cl
18、ad aluminium from sizes 0,2 mm2to 5 mm2; where the whole conductor shall be pulled. 5.2 Conductors Measure three samples per size. These samples shall be firmly gripped and pulled without jerking. Report values of the elongation and tensile strength at the first strand breaking. 6 Requirements The v
19、alues for elongation at break, tensile strength at break and elastic limit (when required) shall conform to those given in the product standard. StressStrainRp0,2% Fracture Plastic regionX Elastic region 0,2 % prEN 3475-505:2010 (E) 5 Annex A (normative) Test method: Braid strength measured after se
20、paration from finished cable The cable jacket is carefully stripped on a length of about 500 mm without any damage to the shield(s) strands. Then, the braid(s) is fully pulled off from these three samples. Each of three of these samples is firmly gripped and pulled without jerking. The recommended test equipment is shown by Figure A.1. Figure A.1 The applied tensile force shall be monitored and recorded. Report values of the tensile strength at the first strand break. Calculate the average values S1 from the 3 measurements. The tensile strength at break of the braid(s) is S1.
