Bsi bs en 03475 505 2012

raising standards worldwide™NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BSI Standards Publication BS EN 3475-505:2012 Aerospace series — Cables, electrical, ai

raising standards worldwide™

NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW

BSI Standards Publication

BS EN 3475-505:2012

Aerospace series — Cables, electrical, aircraft use — Test methods

Part 505: Tensile test on conductors and strands

This British Standard is the UK implementation of EN 3475-505:2012

It supersedes BS EN 3475-505:2007, which is withdrawn

The UK participation in its preparation was entrusted to Technical Committee ACE/6, Aerospace avionic electrical and fibre optic technology

A list of organizations represented on this committee can be obtained on request to its secretary

This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application

© The British Standards Institution 2012 Published by BSI Standards Limited 2012 ISBN 978 0 580 75522 4

ICS 49.060

Compliance with a British Standard cannot confer immunity from legal obligations.

This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 March 2012

Amendments issued since publication

Date Text affected

BS EN 3475-505:2012 EUROPEAN STANDARD

NORME EUROPÉENNE

EUROPÄISCHE NORM

March 2012

English Version

Aerospace series - Cables, electrical, aircraft use - Test methods - Part 505: Tensile test on conductors and strands

Série aérospatiale - Câbles électriques à usage

aéronautique - Méthodes d'essais - Partie 505: Résistance

à la traction des conducteurs et des brins

Luft- und Raumfahrt - Elektrische Leitungen für Luftfahrtverwendung - Prüfverfahren - Teil 505: Zugfestigkeit der Einzeldrähte und Leiterseile

This European Standard was approved by CEN on 20 August 2011

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member

This European Standard exists in three official versions (English, French, German) A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom

EUROPEAN COMMITTEE FOR STANDARDIZATION

C O M I T É E U R O P É E N D E N O R M A L I S A T I O N

E U R O P Ä I S C H E S K O M I T E E FÜ R N O R M U N G

Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2012 CEN All rights of exploitation in any form and by any means reserved

worldwide for CEN national Members

Ref No EN 3475-505:2012: E

Contents Page

Foreword 3

1 Scope .4

2 Normative references .4

3 Terms and definitions 4

4 Apparatus .5

5 Method .6

5.1 Strands .6

5.2 Conductors .6

6 Requirements .6

Annex A (normative) Test method: Braid strength measured after separation from finished cable 7

BS EN 3475-505:2012

EN 3475-505:2012 (E)

3

Foreword

This document (EN 3475-505:2012) has been prepared by the Aerospace and Defence Industries Association

of Europe - Standardization (ASD-STAN)

After enquiries and votes carried out in accordance with the rules of this Association, this Standard has received the approval of the National Associations and the Official Services of the member countries of ASD, prior to its presentation to CEN

This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2012, and conflicting national standards shall be withdrawn at the latest by September 2012

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights This document will supersede EN 3475-505:2007

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom

1 Scope

This European Standard specifies a method of measuring the tensile properties of strands, conductors and braids

When required, it can be used also on cables

It should be used together with EN 3475-100

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 applies For undated references, the latest edition of the referenced document (including any amendments) applies

EN 3475-100, Aerospace series — 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 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)

Key

1 Elastic region

2 Plastic region

3 Fracture

X Strain

Y Stress

Figure 1

BS EN 3475-505:2012

EN 3475-505:2012 (E)

5

3.2

ultimate elongation 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 stress 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

Offset yield strength 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.e., the intersection of the offset line and the 0-stress axis is

at 0,2 % strain (see Figure 2)

Key

1 Elastic region

2 Plastic region

3 Fracture

X Strain

Y Stress

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 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 mm2 and 0,25 mm2; and

 aluminium or copper clad aluminium from sizes 0,2 mm2 to 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 values for elongation at break, tensile strength at break and elastic limit (when required) shall conform to those given in the product standard

BS EN 3475-505:2012

EN 3475-505:2012 (E)

7

Annex A

(normative)

Test method: Braid strength measured after separation

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

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