1、BRITISH STANDARD AEROSPACE SERIES BS EN 2558:1997 Carbon fibre preimpregnates Determination of the volatile content The European Standard EN 2558:1997 has the status of a British Standard ICS 49.040.10BSEN 2558:1997 This British Standard, having been prepared under the direction of the Engineering S
2、ectorBoard, was published underthe authority of the Standards Board and comesintoeffect on 15June1997 BSI 06-1999 The following BSI references relate to the work on this standard: Committee reference ACE/64 Draft for comment 8878342 DC ISBN 0 580 26684 2 Committees responsible for this British Stand
3、ard The preparation of this British Standard was entrusted to Technical Committee ACE/64, Aerospace structural reinforced plastics, upon which the following bodies were represented: British Plastics Federation Ministry of Defence Society of British Aerospace Companies Amendments issued since publica
4、tion Amd. No. Date CommentsBSEN 2558:1997 BSI 06-1999 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 1 Scope 3 2 Normative references 3 3 Principle 3 4 Apparatus 3 5 Specimens 3 6 Procedure 5 7 Expression of results 5 8 Health and safety requirements 5 9 Te
5、st report 5 Figure 1 Example of positioning of specimens on woven carbon fibre fabrics sample across the width 3 Figure 2 Example of positioning of specimens on woven carbon fibre fabric sample along an axis inclined at an angle as close as possible to the weft direction 4 Figure 3 Example of positi
6、oning of specimens on carbon fibre unidirectional sheet or tape sample 4BSEN 2558:1997 ii BSI 06-1999 National foreword This British Standard has been prepared by Technical Committee ACE/64 and is the English language version of EN2558:1997 Aerospace series Carbon fibre preimpregnates Determination
7、of the volatile content, published by the European Committee for Standardization (CEN). EN2558:1997 was produced as a result of international discussions in which the United Kingdom took an active part. Cross-references The British Standards corresponding to the European Standards referred to in the
8、 text are identical in number and title with those given in clause2. A British 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 immun
9、ity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, theENtitlepage, pages2 to5 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment
10、table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN2558 January1997 ICS49.040.10 Descriptors: Aircraft industry, preimpregnated product, carbon fibre, chemical analysis, determination of content, volatile matter English version Aerospace series Carbon fibre preimpreg
11、nates Determination of the volatile content Srie arospatiale Primprgns de fibres decarbone Dtermination de la teneur en matires volatiles Luft- und Raumfahrt Kohlenstoffaser-Prepregs Bestimmung des Anteils an flchtigen Bestandteilen This European Standard was approved by CEN on1996-08-04. CEN member
12、s 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
13、 to the Central Secretariat or to any CEN member. The European Standards exist 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
14、 status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CEN European Committee for Standardization
15、 Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1997 Copyright reserved to CEN members Ref. No. EN 2558:1997 EEN2558:1997 BSI 06-1999 2 Foreword This European Standard has been prepared by the European Association of Aerospace M
16、anufacturers (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 to CEN. This European Standard shal
17、l be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by July1997, and conflicting national standards shall be withdrawn at the latest by July1997. According to the CEN/CENELEC Internal Regulations, the national standards organizati
18、ons of the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the UnitedKingdom.EN 2558:1997 BSI 06-1999 3 1 Scope This stan
19、dard specifies a method for determining the volatile content in carbon fibre preimpregnates for aerospace use. 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 i
20、n 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 it by amendment or revision. For undated references the latest edition of the publication referred
21、to applies. EN 2743, Aerospace series Reinforced plastics Standard procedures for conditioning prior to testing 1) . 3 Principle Measurement of the loss in mass due to exposure of a specimen to an elevated temperature for a specified time. This loss is expressed as a percentage of the initial mass.
22、4 Apparatus 4.1 Balance with an accuracy of0,1mg 4.2 Template of standard specimen 4.3 Ancillary items such as a sharp knife and tweezers 4.4 Specimen support (tray) of suitable material, e.g.metal or ceramic, to retain any resin that may drip during the test. 4.5 Air circulating oven capable of mai
23、ntaining a temperature to an accuracy of 5C. 4.6 Dessiccator containing a suitable drying agent (for example, silica gel, calcium chloride, phosphorus pentoxide). 5 Specimens 5.1 Shape and dimensions The specimen shall be square and have sides of(100 1)mm. Other specimens may be used, subject to agr
24、eement between the user and manufacturer on condition that they have an area of100cm 2with a tolerance of 2%. 5.2 Number and distribution A minimum of three specimens shall be used. They shall: be evenly distributed across the width of the sample; have their centres positioned along a straight line.
25、 SeeFigure 1 for wide woven fabrics, Figure 2 for narrow woven fabrics andFigure 3 for unidirectional sheet or tape. 1) Published as AECMA Prestandard at the date of publication this standard Figure 1 Example of positioning of specimens on woven carbon fibre fabrics sampleacrossthe widthEN2558:1997
26、4 BSI 06-1999 Figure 2 Example of positioning of specimens on woven carbon fibre fabric sample alonganaxis inclined at an angle as close as possible to the weft direction Figure 3 Example of positioning of specimens on carbon fibre unidirectional sheetortapesampleEN 2558:1997 BSI 06-1999 5 6 Procedu
27、re 6.1 Conditioning 6.1.1 Preimpregnates stored at ambient temperature The amount of preimpregnate required for testing shall be sampled and then conditioned in the test atmosphere (see6.2) for a minimum of2h, unless otherwise specified. 6.1.2 Preimpregnates stored below ambient temperature The prei
28、mpregnate, suitably packed in an airtight and 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 than8h. When the material has reached ambient temperature, the amount required for t
29、esting shall be sampled and then conditioned in the test atmosphere (see6.2) for a minimum of2h, unless otherwise specified. 6.2 Atmosphere for testing EN 2743, condition class B. 6.3 Time interval between conditioning and testing After conditioning, the sample shall be maintained in the test atmosp
30、here. Unless otherwise specified, tests shall be carried out within6h. 6.4 Tests 6.4.1 Cut the specimens. 6.4.2 Weigh the tray (m 3 ) after bringing it to constant mass by successive heating operations, to the nearest milligram. 6.4.3 Remove the protective films from the specimen. 6.4.4 Weigh the sp
31、ecimen with its tray to the nearest milligram (m 1 ). 6.4.5 Place the specimen with its tray in the oven maintained at the temperature specified in the material standard and ensure that the hot air circulates well around the specimen. 6.4.6 After the time specified in the material standard remove th
32、e specimen and tray from the oven. 6.4.7 Allow it to cool-down to room temperature in the desiccator. 6.4.8 Weigh the specimen with its tray to the nearest milligram (m 2 ). 7 Expression of results where: 8 Health and safety requirements It is the responsibility of the user of this standard to adopt
33、 appropriate health and safety precautions. 9 Test report It shall include the following: number of this standard; all data ensuring the traceability of the material (trade mark, identification marking, date of receipt etc.); all information regarding the sampling procedure; form and dimensions of s
34、pecimens; period of conditioning; test atmosphere, for example temperature, relative humidity if these differ from6.2; time interval between conditioning and testing (see6.3); temperature and time of exposure in the oven if they differ from the material standard; individual values and arithmetic mea
35、n of the volatile content, any incident which may have affected the results. V is the volatile content expressed as a percentage of the initial mass; m 1 is the initial mass of the specimen and its tray, in grams; m 2 is the mass of the specimen and its tray, after heating, in grams; m 3 is the mass
36、 of the tray, in grams. V m 1 m 2 () (m 1 m 3 ) -100 m =BS EN 2558:1997 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international lev
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