1、BRITISH STANDARD AEROSPACE SERIES BS EN 2562:1997 Carbon fibre reinforced plastics Unidirectional laminates Flexuraltest parallel to the fibre direction The European Standard EN2562:1997 has the status of a British Standard ICS49.025.40BSEN2562:1997 This British Standard, having been prepared under
2、the directionof the Engineering SectorBoard, was published underthe authority of the Standards Board and comes intoeffect on 15 August1997 BSI 09-1999 The following BSI references relate to the work on this standard: Committee reference ACE/64 Draft for comment88/72264 DC ISBN 0 580 26697 4 Committe
3、es responsible for this British Standard 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 Comp
4、anies Amendments issued since publication Amd. No. Date CommentsBSEN2562:1997 BSI 09-1999 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 1 Scope 3 2 Normative references 3 3 Definitions 3 4 Principle 3 5 Apparatus 4 6 Specimens 4 7 Procedure 5 8 Expression
5、of results 5 9 Designation 7 10 Test report 7 Figure 1 4 Figure 2 6 Figure 3 6 Table 1 4 List of references Inside back coverBSEN2562:1997 ii BSI 09-1999 National foreword This British Standard has been prepared by Technical Committee ACE/64 and is the English language version of EN2562:1997 Aerospa
6、ce series Carbon fibre reinforced plastics Unidirectional laminates Flexural test parallel to the fibre direction, published by the European Committee for Standardization(CEN). EN2562:1997 was produced as a result of international discussions in which theUnited Kingdom took an active part. Cross-ref
7、erences The British Standards corresponding to the European Standards referred to in the 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
8、 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, pagesi andii, theEN title page, pages2 to8, an inside back cover and a back cover. This standard has been
9、 updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN2562 March1997 ICS49.025.40 Descriptors: Aircraft industry, reinforced plastic, carbon fibre, laminate,
10、bend test English version Aerospace series Carbon fibre reinforced plastics Unidirectional laminates Flexural test parallel to the fibre direction Srie arospatiale Plastiques renforcs de fibres de carbone Stratifis unidirectionnels Essais de flexion parallle la dirction des fibres Luft- und Raumfahr
11、t Kohlenstoffaserverstrkte Kunststoffe Unidirektionale Laminate Biegeprfungparallel zur Faserrichtung This European Standard was approved by CEN on1996-08-04. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard th
12、e 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. The European Standards exists in three official versions(English, French, German)
13、. 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 the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germ
14、any, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1997 CEN A
15、ll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref.No.EN2562:1997EEN2562:1997 BSI 09-1999 2 Foreword This European Standard has been prepared by the European Association of Aerospace Manufacturers(AECMA). After inquiries and votes carried out in a
16、ccordance 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 national standard, either by publicat
17、ion of an identical text or by endorsement, at the latest by September1997, and conflicting national standards shall be withdrawn at the latest by September1997. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement
18、this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and theUnitedKingdom.EN2562:1997 BSI 09-1999 3 1 Scope This standard specifies the method for the determination of the f
19、lexural strength and flexural modulus of carbon fibre reinforced plastics in the form of unidirectional laminates by a flexural test. This method is only applicable to specimens where the length is parallel to the direction of the fibres. NOTEThe elastic modulus measured by this method can only be c
20、onsidered as an approximate value for YOUNGs modulus. 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
21、 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 to applies. EN2489, Aerospace series Fibre reinforced pla
22、stics Determination of the action of test fluids. EN2565, Aerospace series Preparation of carbon fibre reinforced resin panels for test purposes 1) . EN2743, Aerospace series Reinforced plastics Standard procedures for conditioning prior to testing 1) . EN2744, Aerospace series Non-metallic material
23、s Preferred test temperatures. EN2823, Aerospace series Fibre reinforced plastics Test method for the determination of the effect of exposure to humid atmosphere on physical and mechanical charasteristics 1) . 3 Definitions For the purposes of this standard, the following definitions apply: 3.1 defl
24、ection (f) the distance travelled during the test by a point on the upper or lower face of the specimen at the centre of its span measured from its initial position 3.2 flexural stress the stress at the surface of the material in the middle of the span of the specimen between the supports at any tim
25、e during the test 3.3 flexural strength ( b ) the flexural stress at the time failure occurs 3.4 flexural modulus between P R /10 and P R /2 (E b ) when the stress/strain diagram is derived from the load/deflection recording, the secant modulus is defined as the slope of the straight line passing th
26、rough: the point of the diagram corresponding to a stress calculated from P R /2; the point on the same diagram corresponding to a stress calculated from P R /10. P Ris the load at failure of the specimen the calculated stresses and strains are those present at the surface of the specimen and parall
27、el to its axis 4 Principle The method consists of the measurement of the deflection at the central loading nose as a function of the applied load during a flexural test on three supports carried out at constant rate of displacement until failure occurs. The strain parallel to the fibre direction is
28、calculated as a function of the applied stress. 1) Published as AECMA Prestandard at the date of publication of this standardEN2562:1997 4 BSI 09-1999 5 Apparatus 5.1 Micrometer with6mm diameter flat faces and accurate to0,01mm 5.2 Testing machine, accurate to within1% in the load range used 5.3 Dev
29、ice for recording the deflection as a function of load, accurate to1% in the deflection range used 5.4 If necessary, heated cabinet, regulated so as to conform to EN2744 for tests at temperatures other than ambient. 5.5 Thermocouple and recorder for tests at temperatures other than ambient. 5.6 Test
30、 fixture SeeFigure 1 andTable 1. It shall ensure accurate positioning of the specimen. Misalignment between loading nose and supports shall not exceed0,1mm. 6 Specimens Take specimens from panels prepared according to EN2565. 6.1 Shape and dimensions SeeFigure 1 andTable 1. Table 1 Figure 1 Dimensio
31、ns in millimetres Symbols Type A b Type B b 10 0,2 10 0,2 L 100 1 60 1 l v 80 0,5 50 0,5 h a 2 0,2 2 0,2 r 1 12,5 0,1 12,5 0,1 r 2 5 0,1 5 0,1 a If the ply thickness causes any uncertainty regarding the number of layers necessary to obtain a laminate of the required thickness, this number of layers
32、shall be specified in the relevant material standard. b Type A specimens shall be used unless otherwise specified in material standard.EN2562:1997 BSI 09-1999 5 6.2 Number Minimum of five 7 Procedure 7.1 Conditioning EN2743 for tests in the initial state, EN2489 for tests after immersion, EN2823 for
33、 tests after exposure to humid atmosphere. 7.2 Tests 7.2.1 Measure the width b to within0,01mm at the centre of the specimen Determine h by calculating the arithmetic mean of three measurements of the thickness to within0,01mm taken across the width at the centre of the specimen. Measure the distanc
34、e between supports to within0,1mm. 7.2.2 For tests at temperatures other than ambient, the period separating the conditioning and start of the test shall conform to the following conditions: for specimens which have not been aged or subjected to immersion, the exposure time at the test temperature s
35、hall be established by preliminary tests; for specimens subjected to immersion, seeEN2489; for specimens subjected to humid atmosphere, seeEN2823. 7.2.3 Locate the specimen in the test fixture, with the face specified in the material standard in contact with the loading nose, ensuring that its axis
36、is perpendicular to the supports. If the face in contact with the loading nose is not specified, record its nature (for instance mould side, bag side, .). 7.2.4 The load shall be applied at constant displacement rate: of5mm/min for specimen type A; of2mm/min for specimen type B. 7.2.5 Record the def
37、lection f as a function of load 7.2.6 Record the load at failure P R 8 Expression of results 8.1 Flexural strength b(MPa) where: b is the flexural strength, in megapascals; P R is the load at failure, in newtons; b is the width, in millimetres; h is the thickness, in millimetres; l V is the distance
38、 between supports, in millimetres. b 3 P Rl V 2 b h 2 - =EN2562:1997 6 BSI 09-1999 8.2 Flexural modulus E b(MPa) between P R /10 and P R /2 Measure the deflections from the diagram, seeFigure 2. 8.3 Validity The specimen is held over a sufficiently large span that the failure does not occur in shear
39、 and that strains due to shear loads may be neglected. The test is only considered to be representative of the flexural behaviour of the material if the break is in tension or compression, seeFigure 3. If a specimen has not broken in flexure (tension or compression failure), the calculated strength
40、according to8.1 will be lower than the true strength of the material. EXAMPLES: Figure 2 where: E b is the flexural modulus, in megapascals; P R is the load at failure, in newtons; b is the width, in millimetres; h is the thickness, in millimetres; l V is the distance between supports, in millimetre
41、s; f 1 is the deflection corresponding to P R /10, in millimetres; f 2 is the deflection corresponding to P R /2, in millimetres. Figure 3 E b P Rl V 3 10 b h 3f 2 f 1 () - =EN2562:1997 BSI 09-1999 7 9 Designation EXAMPLE: 10 Test report It shall include the following: designation(see9); all data en
42、suring the traceability of the material (trade mark, identification marking, dateofreceiptetc.); all information regarding specimen preparation; specimen dimensions; test conditions, for example test temperature, relative humidity if these differ from the requirementsin7.2.2; time interval between c
43、onditioning and testing (see7.2.2); face in contact with the loading nose, if necessary; load deflection diagram; flexural strength band mode of failure, seeFigure 3; flexural modulus E bbetween P R /10 and P R /2; individual values, arithmetic mean and standard deviation; any incident which may hav
44、e affected the results.8 blankBSEN2562:1997 BSI 09-1999 List of references Seenational foreword.BS EN 2562:1997 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 standard
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