1、BRITISH STANDARD AEROSPACE SERIES BS EN 2560:1998Carbon fibre preimpregnates Determination of the resin flowThe European Standard EN 2560:1998 has the status of aBritish StandardICS 49.025.40BSEN2560:1998This British Standard, having been prepared under the directionof the Engineering SectorBoard, w
2、as published underthe authority of the Standards Board and comes intoeffect on15October1998 BSI 05-1999ISBN 0 580 30393 4National forewordThis British Standard is the English language version of EN2560:1998.The UK participation in its preparation was entrusted to Technical Committee ACE/64, Aerospac
3、e 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 international and Euro
4、pean developments and promulgate them in the UK.A list of organizations represented on this committee can be obtained on request to its secretary.Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Standard
5、s 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 responsible for t
6、heir correct application.Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis 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 updated (see copyri
7、ght date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.Amendments issued since publicationAmd. No. Date CommentsBSEN2560:1998 BSI 05-1999 iContentsPageNational foreword Inside front coverForeword 2Text of EN 2560 3ii blankEUROPEAN
8、STANDARDNORME EUROPENNEEUROPISCHE NORMEN 2560July 1998ICS 49.025.60Descriptors: Aircraft industry, preimpregnated products, carbon fibres, tests, determination, flow, resins, test specimen, procedureEnglish versionAerospace series Carbon fibre preimpregnates Determination of the resin flowSrie arosp
9、atiale Primprgns de fibres de carbone Dtermination de lcoulement de rsineLuft- und Raumfahrt Kohlenstoffaser-Prepregs Bestimmung des HarzflussesThis European Standard was approved by CEN on15 May1998.CEN members are bound to comply with the CEN/CENELEC InternalRegulations which stipulate the conditi
10、ons for giving this European Standardthe status of a national standard without any alteration. Up-to-date lists andbibliographical references concerning such national standards may be obtainedon application to the Central Secretariat or to any CEN member.This European Standard exists in three offici
11、al versions (English, French,German). A version in any other language made by translation under theresponsibility of a CEN member into its own language and notified to theCentral Secretariat has the same status as the official versions.CEN members are the national standards bodies of Austria, Belgiu
12、m,CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland,Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden,Switzerland and United Kingdom.CENEuropean Committee for StandardizationComit Europen de NormalisationEuropisches Komitee fr NormungCentral Secretariat: rue de
13、 Stassart 36, B-1050 Brussels 1998 CEN All rights of exploitation in any form and by any means reserved worldwide for CENnationalMembers. Ref. No. EN 2560:1998 EEN2560:1998 BSI 05-19992ForewordThis European Standard has been prepared by the European Association of Aerospace Manufacturers (AECMA).Aft
14、er 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 to CEN.This European Standard shall be given the status of a
15、 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 Regulations, the national standards organizations of the following
16、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 United Kingdom.ContentsPageForeword 21 Scope 32 Normative refere
17、nces 33 Principle 34 Apparatus 35 Specimens 36 Procedure 37 Expression of results 78 Test report 7Figure 1 Example of cut-out plan for athree-ply specimen from a fabric sample 4Figure 2 Example of cut-out plan for afive-ply specimen from a narrow fabric sample 5Figure 3 Example of cut-out planfor a
18、three-ply specimen from a sample of unidirectional tape 6EN2560:1998 BSI 05-1999 31 ScopeThis standard specifies a method for determining the resin flow of carbon fibre preimpregnates for aerospace applications.2 Normative referencesThis European Standard incorporates by dated or undated reference p
19、rovisions 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 any of these publications apply to this European Standard only when incorporated in
20、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, Aerospace series Reinforced plastics Standard procedures for conditioning prior to testi
21、ng1). 3 PrincipleDetermination of the difference of the specimen mass per unit area before and after curing under specified conditions of temperature and pressure.4 Apparatus4.1 Balance accurate to 0,1 mg4.2 Template of standard specimen4.3 Ancillary items such as sharp knife and tweezers4.4 Device
22、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 thick4.6 Laboratory timer4.7 Auxiliary materials: glass fabric, ca. six plies,200 mm 200 mm, style181 or similar; perforated polyvinyl fluoride
23、(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 Specimens5.1 Shape and dimensionsThe specimen, of square shape, shall be made up of at least three plies of preimpregnate and h
24、ave 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 the warp yarns; each layer of unidirectional sheet or tape having one of its sides parallel to the fib
25、re direction.Other specimens may be used, subject to agreement between the user and manufacturer, on condition that they have an area of100 cm2 with a tolerance of 2%.5.2 Number and distributionAt least two specimens shall be used.The plies from which these are made shall be evenly distributed and c
26、ut 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 Procedure6.1 Conditioning6.1.1 Preimpregnates stored at ambient temperatureThe amount of preimpregnate required for testing shall be sampled and condit
27、ioned in the test atmosphere (see6.2) for a minimum of2 h, unless otherwise specified.6.1.2 Preimpregnates stored below ambient temperatureThe preimpregnate, suitably packed in an airtight and solvent resistant bag to prevent moisturepick-up, shall be allowed to reach ambient temperature over a peri
28、od 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 conditioned in the test atmosphere (see6.2) for a minimum of2 h, unless otherwise specified.6.2 Test atmosphereEN 2743-B1
29、) Published as AECMA pre-standard at the date of publication of this standard.EN2560:19984 BSI 05-1999Figure 1 Example of cut-out plan for a three-ply specimen from a fabric sampleEN2560:1998 BSI 05-1999 5Figure 2 Example of cut-out plan for a five-ply specimen from a narrow fabric sampleEN2560:1998
30、6 BSI 05-19996.3 Time interval between conditioning and testingAfter conditioning, the sample shall be maintained in the test atmosphere. Unless otherwise specified, tests shall be carried out within6 h.6.4 TestsCut the necessary number of plies from the preimpregnate, using the appropriate template
31、.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 the range specified in5.1.Weigh the specimen to 1 mg (mo) and then assemble the pack between the two metal plates (see4.5), s
32、tarting 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; three layers glass bleeder fabric; one layer PTFE coated glass fabric.Locate the assembly between the platens of the device (s
33、ee4.4) 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, pressure applied to the assembly and period of application are specified on the relevant prepreg data sheet.Remove the assembly from
34、 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 centre of the cured specimen and weigh thisto 1mg (m1).Subject to agreement between the user and manufacturer, a circle with a diameter
35、 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 77 Expression of results7.1 Uncorrected resin flowwhere: Calculate the arithmetic mean of the values obtained for F1.7.2 Resin flow correct
36、ed for volatile contentwhere: Calculate the arithmetic mean of the values obtained for F2.8 Test reportIt shall include the following: number of this standard; all data ensuring the traceability of the material (trade mark, identification marking, date of receipt, batch number,etc.); all information
37、 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 conditioning; exposure time at the test atmosphere; temperature of the platens pressure and period of application; arithmetic mean of the uncorrected
38、resin flow (and corrected resin flow, if required); individual values; any incident which may have affected the results.F1 is the uncorrected resin flow as a percentage of the initial mass,m0 is the initial mass of the specimen, in grams,m1 is the mass of the square or circle cut out from the cured
39、specimen, in grams,S1 is the original area of the specimen, in square millimetres,S2 is the area of the square or circle cut out from the cured specimen, in square millimetres.F2 is the corrected resin flow as a percentage of the initial mass;m0 is the initial mass of the specimen, in grams;m1 is th
40、e mass of the square or circle cut out from the cured specimen, in grams,S1 is the original area of the specimen, in square millimetres,S2 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
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