1、BRITISH STANDARD AEROSPACE SERIES Fibre reinforced plastics Standard procedures for conditioning prior to testing un materials aged The European Standard EN 2743:2001 has the status of a British Standard ICs 49.025.40 BS EN 2743 :2002 Wk present to the responsible European committee any enquiries on
2、 the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. - A list of organizations represented on this committee can be obtained on request to its secretary. Cr oss-r e fer enc e s The Bri
3、tish Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A Briti
4、sh Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front
5、 cover, an inside front cover, the EN title page, pages 2 to 6, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. O BSI 11 January 2002 ISBN O 580 37996 5 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2743 Dec
6、ember 2001 ICs 49.025.40 English version Aerospace series - Fibre reinforced plastics - Standard procedures for conditioning prior to testing unaged materials Srie arospatiale - Plastiques renforcs de fibres - Procdures normalises pour le conditionnement avant essais sur matriaux non vieillis Luft-
7、und Raumfahrt - Faserverstrkte Kunststoffe - Standardvetfahren fr Vorbehandlung vor der Prfung von nicht gealterten Werkstoffen This European Standard was approved by CEN on 2 May 2001 CEN members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving
8、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 Management Centre or to any CEN member. This European Standard exists in three official versions (
9、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 Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Re
10、public, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION EUROPISCHES KOMITEE FR NORMUNG COMIT EUROPEN DE NORMALISATION Management Centre: rue de Stassar
11、t, 36 B-1050 Brussels O 2001 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 2743:2001 E EN 2743:2001 (E) Foreword This European Standard has been prepared by the European Association of Aerospace Manufacturers (AECMA) . After inqu
12、iries 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 AECMA, prior to its presentation to CEN. This European Standard shall be given the status of a natio
13、nal standard, either by publication of an identical text or by endorsement, at the latest by June 2002, and conflicting national standards shall be withdrawn at the latest by June 2002. According to the CENKENELEC Internal Regulations, the national standards organizations of the following countries
14、are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. 2 EN 2743:2001 (E) 1 Scope This standard specifies the st
15、andard procedures for conditioning prior to testing unaged fibre reinforced plastic materials including reinforcing fibres and cured resin systems for aerospace applications. NOTE specified in the relevant technical specification or test method. In the case of uncured preimpregnate materials, requir
16、ements for conditioning before testing are 2 Normative references This European Standard incorporates by dated or undated reference provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated refe
17、rences, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 3615 Aerospace series - Fibre reinforced plastics - P
18、rocedure for the determination of the conditions of exposure to humid atmosphere and the determination of moisture absorption 1) 3 Definitions For the purposes of this standard, the following definitions apply. 3.1 Conditioning The whole series of operations intended to bring a sample or specimens i
19、nto a state of equilibrium with regard to temperature or temperature and humidity. 3.2 The condition of a specimen or sample directly after manufacture, the water content of which has never exceeded 10 % of the maximum moisture absorption at a relative humidity of 85 %. As-cu red con d it i on 4 Pri
20、nciple Exposure of an unaged material in a conditioning atmosphere which allows it to be maintained in the as- cured condition or restored as near to the as-cured condition as possible. 5 Apparatus 5.1 required. Climatic chamber capable of maintaining the specified temperature and relative humidity,
21、 if 5.2 Sealed container such as metallized polyethylene bag or airtight metal box 5.3 Desiccant salt bags such as phosphorus pentoxide 5.4 Clean and dry absorbent cloth or filter paper 1) Published as AECMA Prestandard at the date of publication of this standard 3 EN 2743:2001 (E) See 6.2.1 6 Stand
22、ard atmospheres The atmospheric pressure shall be between 86 kPa and 106 kPa. No code 6.1 Nominal temperature and humidity 6.1 .I Where the control of both temperature and humidity is necessary: Remarks OC, 50 % relative humidity 6.1.2 6.1.3 Where only the control of temperature is necessary: 23 OC,
23、 ambient humidity Where no control of temperature and humidity is necessary: ambient atmosphere Condition to be used unless As cured otherwise condition (see 3.2) specified 6.2 Tolerances 6.2.1 Temperature Standard tolerance: Close tolerance: 6.2.2 Relative humidity Standard tolerance: Close toleran
24、ce: f 2 “C (no code). f 1 “C (code T). f 5 % (no code). f 2 % (code H). 7 See table 1. Cho ce of condi ti on in g types Table 1 Material Fibre reinforced plastics and cured resin systems B I A I Code of conditioning type -1 Temperature “C Ambient E Relative humidity % Tolerance code See 6.2.1 and I
25、6.2.2 No code 168 Ia Duration h I I a See test method or product standard. Reinforcing fibres CID 23 I Ambient Ambient 4 EN 2743:2001 (E) 8 Procedure The procedure for handling specimens or samples shall be conducted so that the moisture absorption: or is sufficiently low to have a negligible effect
26、 on the caracteristics; remains constant to allow reproducibility of the tests. 8.1 Conditioning type A All panels and specimens shall be stored in the sealed container containing desiccant salt bags. The total cumulative time that the panel remains outside the sealed container, for machining or oth
27、er operations, shall not exceed 8 h. In cases where wet machining is used, the specimens shall be cleaned and wiped dry immediately on completion. Specimens in the as-cured condition shall be tested within 168 h from the demoulding operation. If this time is exceeded, the moisture absorption shall b
28、e confirmed as being less than 10 % of the maximum moisture absorption achieved during exposure at 85 % relative humidity. The maximum moisture absorption is obtained at equilibrium according to EN 3615 Where the specimens have exceeded 10 % of the maximum moisture absorption, the ascured condition
29、shall be restored by drying in accordance with EN3615B. This operation is only allowed once. 8.2 Conditioning type B See table 1. 8.3 See table 1. The specimens shall be supported in such a way to ensure maximum exposure during conditioning. Conditioning types C and D 9 Designation EXAMPLE: Number o
30、f this standard Conditioning type (see 7) Temperature tolerance code (if applicable, see table 1) Humidity tolerance code (if applicable, see table 1) 5 EN 2743:2001 (E) 10 Report It shall include the following: designation (see 9); all data ensuring the traceability of the material (trade mark, ide
31、ntification marking, date of receipt, batch number, etc.); conditioning time (if applicable); maximum moisture absorption measured to EN 3615, at 85 % of relative humidity (if applicable); full description of the drying in accordance with EN3615B (if applicable) and results; any incident which may h
32、ave affected the results. 6 BS EN 2743 :2002 BSI 389 Chiswick High Road Lon don w4 4AL BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Re vi si ons Br
33、itish Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity
34、while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: +44 (0)20 8996 9000. Fax: +44 (0)20 8996 7400. BSI offers members an individual updating service called PLUS which ensures that subs
35、cribers automatically receive the latest editions of standards. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel: +44 (0)20 8996 9001. Fax: +44 (0)20 8996 7001. Email: orders&-. Standards are also available from the B
36、SI website at http:/www.bsi-. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested. Information on standards BSI provides a wide range of information on national, Europe
37、an and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also available which give details on all its products and services. Contact the Information Centre. Tel: +44 (0)20 8996 71 11. Fax: +44 (0)20 8996 7048. Ema
38、il: infomi-. Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For details ofthese and other benefits contact Membership Administration. Tel: +44 (0)20 8996 7002. Fax: +44 (0)20 8996 700 1. Email: membersh
39、ipbsi-. Information regarding online access to British Standards via British Standards Online can be found at http:/www.bsi- Further information about BSI is available on the BSI website at http:/www.bsi-. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK,
40、 ofthe publications of the international standardization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means - electronic, photocopying, recording or otherwise -without pri
41、or written permission from BSI. This does not preclude the free use, in the course of implementing the standard, ofnecessary details such as symbols, and size, type or grade designations. Ifthese details are to be used for any other purpose than implementation then the prior written permission ofBSI must be obtained. Details and advice can be obtained from the Copyright & Licensing Manager. Tel: +44 (0)20 8996 7070. Fax: +44 (0)20 8996 7553. Email: copyright&-.
