1、BRITISH STANDARD AEROSPACE SERIES BS EN 2563:1997 Carbon fibre reinforced plastics Unidirectional laminates Determination of the apparent interlaminar shear strength The European Standard EN2563:1997 has the status of a British Standard ICS 49.040.10BSEN 2563:1997 This British Standard, having been
2、prepared under the directionof the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 June1997 BSI 02-1999 The following BSI references relate to the work on this standard: Committee reference ACE/64 Draft for comment 88/72264 DC ISBN 0 580
3、 26685 0 Committees 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 Briti
4、sh Aerospace Companies Amendments issued since publication Amd. No. Date CommentsBSEN 2563:1997 BSI 02-1999 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 3 6 Specimens 3 7 Procedu
5、re 4 8 Expression of results 5 9 Test report 7 Figure 1 4 Figure 2 6 Figure 3 6 Table 1 5BSEN 2563:1997 ii BSI 02-1999 National foreword This British Standard has been prepared by Technical Committee ACE/64 and is the English language version of EN2563:1997 Aerospace series Carbon fibre reinforced p
6、lastics Unidirectional laminates Determination of the apparent interlaminar shear strength, published by the European Committee for Standardization (CEN). EN2563:1997 was produced as a result of international discussions in which the United Kingdom took an active part. Cross-references The British S
7、tandards 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 correct application.
8、 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 updated (see copyright date) and may hav
9、e had amendments incorporated. This will be indicated in the amendment table on theinside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN2563 January1997 ICS 49.040.10 Descriptors: Aircraft industry, reinforced plastic, carbon fibre, determination, shear strength English version Aer
10、ospace series Carbone fibre reinforced plastics Unidirectional laminates Determination of the apparent interlaminar shear strength Srie arospatiale Plastiques renforcs de fibres de carbone Stratifis unidirectionnels Dtermination de la rsistance apparente au cisaillement interlaminaire Luft- und Raum
11、fahrt Kohlenstoffaserverstrkte Kunststoffe Unidirektionale Laminate Bestimmung der scheinbaren interlaminaren Scherfestigkeit This European Standard was approved by CEN on 1996-08-04. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving
12、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. This European Standards exist in three official versions
13、 (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 the national standards bodies of Austria, Belgium, Denm
14、ark, 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 Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36,
15、B-1050 Brussels 1997 Copyright reserved to CEN members Ref. No. EN 2563:1997 EEN2563:1997 BSI 02-1999 2 Foreword This European Standard has been prepared by the European Association of Aerospace Manufacturers (AECMA). After inquiries and votes carried out in accordance with the rules of this Associa
16、tion, 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 publication of an identical text or by endorseme
17、nt, 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 organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Denmark,
18、 Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.EN2563:1997 BSI 02-1999 3 1 Scope This standard specifies the method for the determination of the apparent interlaminar shear strength of carbon fi
19、bre reinforced plastics in the form of unidirectional laminates by means of a flexural test. It is intended for specimens in which the length is parallel to the fibre direction. This method can equally be applied to carbon fibre reinforced plastics in the form of woven fabrics. In the case of cross-
20、ply laminates comprising layers orientated in different directions, the results obtained by the formula given in8.1 can only be used to make comparisons of laminates with identical lay-up. 2 Normative references This European Standard incorporates by dated or undated reference provisions from other
21、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 it by amendment or re
22、vision. For undated references the latest edition of the publication referred to applies. EN 2489, Aerospace series Fibre reinforced plastics Determination of the action of test fluids. EN 2565, Aerospace series Preparation of carbon fibre reinforced resin panels for test purposes 1) . EN 2743, Aero
23、space series Reinforced plastics Standard procedures for conditioning prior to testing 1) . EN 2744, Aerospace series Non-metallic materials Preferred test temperatures. EN 2823, Aerospace series Fibre reinforced plastics Test method for the determination of the effect of exposure to humid atmospher
24、e on physical and mechanical characteristics 1) . 3 Definitions For the purposes of this standard, the following definition apply: apparent interlaminar shear strength it is the maximum shear stress calculated at half thickness of the specimen at the moment of first failure 4 Principle This method c
25、onsists of the determination of the resistance to delamination under shear forces parallel to the layers of the laminate. For this determination, a specimen of rectangular cross section is tested in flexure on two supports. The load is applied at the centre of the specimen by means of a loading nose
26、 midway between the supports. This test gives information about the quality of the resin fibre relation. 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 Device for recording load with respect to time or
27、 to loading nose displacement. 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 fixture See Figure 1 andTable 1. It shall allow an adjustment of th
28、e distance between supports. It shall ensure accurate positioning of the specimen and shall have less than a0,02mm off-centre error of loading nose with respect to supports. The misalignment between loading nose and supports shall not be greater than0,02mm. The loading nose and supports shall be mad
29、e from steel having a tensile strength $ 1000MPa. 6 Specimens Take specimens from panels prepared according to EN2655. 1) Published as AECMA Prestandard at the date of publication of this standardEN2563:1997 4 BSI 02-1999 6.1 Form and dimension See Figure 1 andTable 1. The scatter between specimen t
30、hicknesses within a set, see6.2, shall be such that: where: The length of the specimen is parallel to the fibre direction for unidirectional laminates and parallel to the warp direction for fabrics. 6.2 Number Minimum of five 7 Procedure 7.1 Conditioning EN 2743 for tests in the initial state, EN 24
31、89 for tests after immersion, EN 2823 for 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 c
32、entre of the specimen. Measure the distance between supports to within0,1mm. 7.2.2 For qualification testing and in case of disagreement, the distance between supports shall be adjusted so that: where: 7.2.3 For tests at temperatures other than ambient, the period separating the conditioning and sta
33、rt 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 shall be established by preliminary tests; for specimens subjected to immersion, seeEN2489; for specimens subjected to humid atmospher
34、e, see EN2823. 7.2.4 Locate the specimen in the test fixture, ensuring that its axis is perpendicular to the supports. Figure 1 h max. is the maximum thickness, in millimetres; h min. is the minimum thickness, in millimetres; is the arithmetic mean thickness h of specimens within a set (millimetres)
35、. h max.h min. h - 0,05 h l v is the distance between supports (millimetres); is the arithmetic mean thickness h of specimens within a set (millimetres). l v 5 . h () 0,1 = hEN2563:1997 BSI 02-1999 5 Table 1 7.2.5 Load the specimen smoothly at a constant displacement rate of the loading nose of V =
36、(1 0,1)mm/min. 7.2.6 Record load as a function of time or displacement of the loading nose. 7.2.7 Record the load at failure (P R ). 8 Expression of results 8.1 The apparent interlaminar shear strength shall be calculated as follows: where: 8.2 Validity 8.2.1 If a specimen fails in shear approximate
37、ly at the neutral fibre axis (seeFigure 2), the interlaminar shear strength is calculated in accordance with the formula in8.1. 8.2.2 If a specimen fails in flexure or by plastic deformation (seeFigure 3), the result obtained by the formula in8.1 is not a true shear stress at failure. This result ma
38、y only be used for comparison with those from a series of tests related to a same material (e.g.batch control). Dimensions in millimetres Symbols Values r 1 3 0,1 r 2 3 0,1 b 10 0,2 L 20 0,25 l v 10 0,1 h a 2 0,2 a If the ply thickness causes any uncertainty regarding the number of layers necessary
39、to obtain a laminate of the required thickness, this number of layers shall be specified in the relevant material standard. t is the apparent interlaminar shear strength, in megapascal; P R is the maximum load at the moment of first failure, in newtons; b is the width of specimen, in millimetres; h
40、is the thickness of specimen, in millimetres. t= 3 P R 4 b h -EN2563:1997 6 BSI 02-1999 Figure 2 Figure 3 EN2563:1997 BSI 02-1999 7 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 r
41、eceipt etc.); all information regarding specimen preparation; specimen dimensions and the chosen distance between supports; test conditions, for example test temperature, relative humidity if these differ from the requirements of7.2.3; time interval between conditioning and testing (see7.2.3); load
42、time or displacement diagram; apparent interlaminar shear strength and mode of failure; individual values, arithmetic mean and standard deviation; any incident which may have affected the results.BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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