1、BRITISH STANDARD AEROSPACE SERIES BS EN 2560: 1998 Carbon fibre preimpregnates Determination of the resin flow The European Standard EN 2560:1998 has the status of a British Standard ICS 49.025.40BSEN2560:1998 This British Standard, having been prepared under the directionof the Engineering SectorBo
2、ard, was published underthe authority of the Standards Board and comes intoeffect on 15October1998 BSI 05-1999 ISBN 0 580 30393 4 National foreword This British Standard is the English language version of EN2560:1998. The UK participation in its preparation was entrusted to Technical Committee ACE/6
3、4, Aerospace structural reinforced plastics, which has the responsibilityto: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related internation
4、al 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. Cross-references The British Standards which implement international or European publications referred to in this document may be found in th
5、e BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are re
6、sponsible 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 cover, an inside front cover, pages i and ii, theEN title page, pages2 to7 and a back cover. This standard has been
7、updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSEN2560:1998 BSI 05-1999 i Contents Page National foreword Inside front cover Foreword 2 Text of
8、EN 2560 3ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2560 July 1998 ICS 49.025.60 Descriptors: Aircraft industry, preimpregnated products, carbon fibres, tests, determination, flow, resins, test specimen, procedure English version Aerospace series Carbon fibre preimpregnates Determi
9、nation of the resin flow Srie arospatiale Primprgns de fibres de carbone Dtermination de lcoulement de rsine Luft- und Raumfahrt Kohlenstoffaser-Prepregs Bestimmung des Harzflusses This European Standard was approved by CEN on15 May1998. CEN members are bound to comply with the CEN/CENELEC Internal
10、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 Central Secretariat or to any CEN member. Th
11、is 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 Central Secretariat has the same status as the official versions. CEN members are t
12、he national standards bodies of Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Eur
13、opisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1998 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN nationalMembers. Ref. No. EN 2560:1998 EEN2560:1998 BSI 05-1999 2 Foreword This European Standard has been prepared by the
14、European Association of Aerospace Manufacturers (AECMA). After inquiries 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
15、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 January1999, and conflicting national standards shall be withdrawn at the latest by January1999. According to the CEN/CENELEC Internal Regul
16、ations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the Un
17、ited Kingdom. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Principle 3 4 Apparatus 3 5 Specimens 3 6 Procedure 3 7 Expression of results 7 8 Test report 7 Figure 1 Example of cut-out plan for a three-ply specimen from a fabric sample 4 Figure 2 Example of cut-out plan for a five-ply
18、 specimen from a narrow fabric sample 5 Figure 3 Example of cut-out plan for a three-ply specimen from a sample of unidirectional tape 6EN2560:1998 BSI 05-1999 3 1 Scope This standard specifies a method for determining the resin flow of carbon fibre preimpregnates for aerospace applications. 2 Norma
19、tive 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 references, subsequent amendments to or revisions of a
20、ny 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 2558, Aerospace series Carbon fibre preimpregnates Determination of the volatile content. EN 2743, Aero
21、space series Reinforced plastics Standard procedures for conditioning prior to testing 1) . 3 Principle Determination of the difference of the specimen mass per unit area before and after curing under specified conditions of temperature and pressure. 4 Apparatus 4.1 Balance accurate to 0,1 mg 4.2 Te
22、mplate of standard specimen 4.3 Ancillary items such as sharp knife and tweezers 4.4 Device capable of maintaining the specified temperature to 5 C and the specified pressureto 5%. 4.5 Metal plates not less than200 mm 200 mm and approximately1,6 mm thick 4.6 Laboratory timer 4.7 Auxiliary materials:
23、 glass fabric, ca. six plies,200 mm 200 mm, style181 or similar; perforated polyvinyl fluoride (PVF) film,0,1mmthickness,200 mm 200 mm; glass fabric coated with polytetrafluoroethylene (PTFE), two plies,200mm 200 mm. 4.8 Template or punch for cutting cured specimens. 5 Specimens 5.1 Shape and dimens
24、ions The specimen, of square shape, shall be made up of at least three plies of preimpregnate and have a total mass of at least12 g. The dimension of the sides shall be(100 1) mm. The plies shall be assembled by crossing alternatively each layer: each fabric layer having its diagonals parallel to th
25、e warp yarns; each layer of unidirectional sheet or tape having one of its sides parallel to the fibre direction. Other specimens may be used, subject to agreement between the user and manufacturer, on condition that they have an area of100 cm 2with a tolerance of 2%. 5.2 Number and distribution At
26、least two specimens shall be used. The plies from which these are made shall be evenly distributed and cut along a straight line covering the width of the sample. SeeFigure 1 andFigure 2 for woven fabrics andFigure 3 for unidirectional sheet or tape. 6 Procedure 6.1 Conditioning 6.1.1 Preimpregnates
27、 stored at ambient temperature The amount of preimpregnate required for testing shall be sampled and conditioned in the test atmosphere (see6.2) for a minimum of2 h, unless otherwise specified. 6.1.2 Preimpregnates stored below ambient temperature The preimpregnate, suitably packed in an airtight an
28、d solvent resistant bag to prevent moisture pick-up, shall be allowed to reach ambient temperature over a period of time depending on its mass. This time shall not be less than8 h. When the material has reached ambient temperature, the amount required for testing shall be sampled and then conditione
29、d in the test atmosphere (see6.2) for a minimum of2 h, unless otherwise specified. 6.2 Test atmosphere EN 2743-B 1) Published as AECMA pre-standard at the date of publication of this standard.EN2560:1998 4 BSI 05-1999 Figure 1 Example of cut-out plan for a three-ply specimen from a fabric sampleEN25
30、60:1998 BSI 05-1999 5 Figure 2 Example of cut-out plan for a five-ply specimen from a narrow fabric sampleEN2560:1998 6 BSI 05-1999 6.3 Time interval between conditioning and testing After conditioning, the sample shall be maintained in the test atmosphere. Unless otherwise specified, tests shall be
31、 carried out within6 h. 6.4 Tests Cut the necessary number of plies from the preimpregnate, using the appropriate template. Remove the separating film(s) and carefully superimpose the preimpregnate plies, oriented alternately at0 /90 , to form a uniform pack and give a specimen of total mass within
32、the range specified in5.1. Weigh the specimen to 1 mg (m o ) and then assemble the pack between the two metal plates (see4.5), starting with the bottom layer: one layer PTFE coated glass fabric; three layers glass bleeder fabric; one layer perforated PVF film; specimen; one layer perforated PVF film
33、; three layers glass bleeder fabric; one layer PTFE coated glass fabric. Locate the assembly between the platens of the device (see4.4) heated at the specified temperature and apply the specified pressure in less than10 s, then maintain it for the specified period. NOTETemperature of the platens, pr
34、essure applied to the assembly and period of application are specified on the relevant prepreg data sheet. Remove the assembly from the device. Allow it to cool down in the test atmosphere (see6.2). Remove the perforated PVF films and bleeder fabrics. Cut out a square of sides (70 0,7) mm from the c
35、entre of the cured specimen and weigh thisto1mg (m 1 ). Subject to agreement between the user and manufacturer, a circle with a diameter of(50 1)mm may be substituted for the square. Figure 3 Example of cut-out plan for a three-ply specimen from a sampleofunidirectionaltapeEN2560:1998 BSI 05-1999 7
36、7 Expression of results 7.1 Uncorrected resin flow where: Calculate the arithmetic mean of the values obtained for F 1 . 7.2 Resin flow corrected for volatile content where: Calculate the arithmetic mean of the values obtained for F 2 . 8 Test report It shall include the following: number of this st
37、andard; all data ensuring the traceability of the material (trade mark, identification marking, date of receipt, batch number,etc.); all information regarding the sampling procedure; specimen dimensions if these differ from5.1; shape of the area cut-out from the cured specimen (see6.4); period of co
38、nditioning; exposure time at the test atmosphere; temperature of the platens pressure and period of application; arithmetic mean of the uncorrected resin flow (and corrected resin flow, if required); individual values; any incident which may have affected the results. F 1 is the uncorrected resin fl
39、ow as a percentage of the initial mass, m 0 is the initial mass of the specimen, in grams, m 1 is the mass of the square or circle cut out from the cured specimen, in grams, S 1 is the original area of the specimen, in square millimetres, S 2 is the area of the square or circle cut out from the cure
40、d specimen, in square millimetres. F 2 is the corrected resin flow as a percentage of the initial mass; m 0 is the initial mass of the specimen, in grams; m 1 is the mass of the square or circle cut out from the cured specimen, in grams, S 1 is the original area of the specimen, in square millimetre
41、s, S 2 is the area of the square or circle cut out from the cured specimen, in square millimetres. V is the volatile content, determined according to EN2558, in per cent.BS EN 2560: 1998 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body resp
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