1、BRITISH STANDARD AEROSPACE SERIES BS EN 2377:1989 Glass fibre reinforced plastics Test method Determination of apparent interlaminar shear strength This European Standard EN2377 has the status of a British Standard. UDC 678.067.5-41:620.176:629.7BSEN2377:1989 This British Standard, having been prepa
2、red under the directionof the Aerospace Standards Policy Committee, waspublished under the authorityof the Board of BSIandcomes into effect on 30November1989 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference ACE/64 Draft for comment88/70403 DC ISBN 0 5
3、80 17743 2 Cooperating organizations The European Committee for Standardization, under whose supervision this European Standard was prepared, comprises the national standards organizations of the following Western European countries. Austria Oesterreichisches Normungsinstitut Belgium Institut belge
4、de normalisation Denmark Dansk Standardiseringsraad Finland Suomen Standardisoimisliito, r.y. France Association franaise de normalisation Germany Deutsches Institut fr Normung e.V. Greece Hellenic Organization for Standardization Iceland Icelandic Council for Standardization Ireland National Standa
5、rds Authority of Ireland Italy Ente Nazionale Italiano di Unificazione Luxemburg Inspection des travails et des mines Netherlands Nederlands Normalisatie-instituut Norway Norges Standardiseringsforbund Portugal Instituto Portugus da Qualidade Spain Instituto Espaol de Normalizacin Sweden Standardise
6、ringskommissionen i Sverige Switzerland Association suisse de normalisation UnitedKingdom British Standards Institution Amendments issued since publication Amd. No. Date of issue CommentsBSEN2377:1989 BSI 01-2000 i Contents Page Cooperating organizations Inside front cover National foreword ii Brief
7、 history 2 Text of EN 2377 3 National appendix A Inside back cover National appendix B Inside back coverBSEN2377:1989 ii BSI 01-2000 National foreword This British Standard has been prepared under the direction of the Aerospace Standards Policy Committee and is the English language version ofEN 2377
8、 “Aerospace series. Glass fibre reinforced plastics. Test method. Determination of apparent interlaminar shear strength”, published by the European Committee for Standardization (CEN). EN2377 was produced as a result of international discussion in which the UK took an active part. A British Standard
9、 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 immunity from legal obligations. Summary of pages This document comprises a front cover, an
10、inside front cover, pages i and ii, theEN title page, pages 2 to 6, an inside back cover 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 table on the inside front cover.EUROPEAN STANDARD NORME EUR
11、OPENNE EUROPISCHE NORM EN2377 January 1989 UDC: 678.067.5-41:620.176:629.7 Key words: Aircraft industry, glass reinforced plastics, plates, test method, shear stress English version Aerospace series Glass fibre reinforced plastics Test method Determination of apparent interlaminar shear strength Sri
12、e arospatiale Plastiques renforcs de fibres de verre Mthodedessai Dtermination des proprits en cisaillement apparent interlaminaire Luft- und Raumfahrt Glasfaserverstrkte Kunststoffe Prfverfahrenzur Bestimmung der scheinbaren interlaminaren Scherfestigkeit This European Standard was accepted by CEN
13、on1988-03-17. CEN members are bound to comply with the requirements of CEN 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 standard
14、s may be obtained on application to the Central Secretariat or to any CEN member. This 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 CEN
15、 Central Secretariat has the same status as the official versions. CEN members are the national standards organizations of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxemburg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CEN
16、 European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels CEN1989 Copyright reserved to all CEN members Ref. No. EN 2377:1989 EEN2377:1989 BSI 01-2000 2 Brief history This draft European Standard has
17、 been prepared by the European Association of Aerospace Manufacturers (AECMA). After enquiries and votes carried out in accordance with the rules of this Association, this draft has successively received the approval of the National Associations and the Official Services of the member countries of A
18、ECMA, prior to its presentation to CEN. In accordance with the Common CEN/CENELEC Rules, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxemburg, Netherlands, Norway, Portugal, Spain, Swede
19、n, Switzerland and UnitedKingdom. Contents Page Brief history 2 1 Scope and field of application 3 2 References 3 3 Definition 3 4 Principle of the method 3 5 Test specimens 3 6 Apparatus 4 7 Conditioning 4 8 Procedure 4 9 Test results 4 10 Calculation and expression of results 5 11 Test report 5 An
20、nex A Determination of the estimated valueofstandard deviation 6 Figure 1 3 Figure 2 Testing device 4 Figure 3.a Shear modes of failure 4 Figure 3.b Non-shear modes of failure 5EN2377:1989 BSI 01-2000 3 1 Scope and field of application This standard defines a method for the determination of the appa
21、rent interlaminar shear strength by delamination of textile glass fibre reinforced plastics produced in sheet form for aerospace use. 2 References EN 62, Glass reinforced plastics Standard atmospheres for conditioning and testing. EN 2374, Aerospace series Glass fibre reinforced mouldings and sandwi
22、ch composites Production of test panels. 3 Definition The apparent interlaminar shear strength is the maximum interlaminar shear stress at the moment of first failure. It is expressed in MPa. 4 Principle of the method For the determination of the resistance in interlaminar shear parallel to the laye
23、rs of reinforcement, a specimen of rectangular cross section is tested in flexion. The specimen resting on two supports and the force applied by means of a loading nose midway between the supports. 5 Test specimens The test specimens are prepared according toEN2374. 5.1 Dimensions 5.1.1 Standard spe
24、cimens 5.1.2 Alternative specimens When it is not possible or desirable to use the standard specimens, the following rules shall be observed: a) The length and the thickness of the test specimen shall be in the same ratio as in the standard specimen: 1=6,7 h 0,5 mm b) The width and the thickness of
25、the test specimen shall be in the same ratio as in the standard specimen: b = 3,3 h 0,2 mm. WARNING: If the thickness of the test specimen is greater than3mm excessive compressive stresses may occur under the loading nose. 5.2 Position of specimens SeeFigure 1. 5.3 Number of test specimens 5.3.1 The
26、 number of test specimens shall be a minimum of5 from each direction. 5.3.2 When the material shows a significant difference in shear properties in two principal directions, it is to be tested in these two directions (seeFigure 1, specimen A and B). When the fibres are oriented unidirectionally, the
27、 test shall be carried out in that direction only. Length1 : (20 0,5) mm Width b : (10 0,2) mm Thickness h: (3 0,2) mm Figure 1 EN2377:1989 4 BSI 01-2000 6 Apparatus Calibrated standard testing machine, which can be operated at a constant rate of the loading nose and in which the accuracy of measure
28、ment shall be within 1%. The loading nose and supports shall be made from steel having a tensile strengthU 1000MPa. The span shall be adjustable. 7 Conditioning The standard atmosphere shall be in accordance with EN62. The test specimens shall be conditioned at(23 2) C and(50 5)% relative humidity d
29、uring at least16h. 8 Procedure Unless otherwise specified, carry out the test at(23 2) C and(50 5)% relative humidity. Measure the dimensions of b and h to the nearest0,05mm, respectively and adjust the span tol V =5h 0,1mm. Load the specimen without bumping with a rate of the loading nose ofV=(1 0,
30、1)mm/min (seeFigure 2). The load shall be taken as a function of time or displacement of the loading nose. 9 Test results 9.1 If the specimens fail in horizontal shearapproximately at the neutral fibre axis (seeFigure 3.a), the true interlaminar shear stress shall be calculated in accordance with th
31、e formula inclause10. 9.2 If test specimens fail in flexural i.e.tension orcompression failure of the outer surface (seeFigure 3.b), the results calculated by the formula inclause10 are not true shear stresses. These results shall only be used for a comparison of test series of a same material (i.e.
32、batch control). Figure 2 Testing device NOTEIn the case of translucent materials an off-white colour becomes evident. Figure 3.a Shear modes of failureEN2377:1989 BSI 01-2000 5 10 Calculation and expression of results The apparent shear stress shall be calculated as follows: where: 11 Test report Th
33、e test report shall include the following informations: 11.1 Number of this standard, brand, identification mark, origin, date of receipt and further data of the tested material. 11.2 Data about the preparation of the test specimens. 11.3 Measured dimensions of the test specimens and of the span. 11
34、.4 Actual radii of the loading nose and supports. 11.5 A graph representing the load measured as a function of time or displacement. 11.6 When test specimens have been broken in shear the single values, the arithmetic mean and the standard deviation (seeAnnex A) shall be recorded. 11.7 When test spe
35、cimens have not been broken in shear a full description of type of failure shall be given with the note, that the calculated stresses are not true shear stresses. The single values, the arithmetic mean and the standard deviation (seeAnnex A) shall be recorded. 11.8 Test conditions i.e.temperature an
36、d relative humidity if deviating from this standard. 11.9 Observations on any circumstances liable to influence the results. Figure 3.b Non-shear modes of failure E = The apparent shear stress in MPa F = Maximum force at the moment of the firstfailure, in N b = Width of specimen in mm h = Thickness
37、of specimen in mm 3 4 - F b . h - =EN2377:1989 6 BSI 01-2000 Annex A Determination of the estimated value of standard deviation The estimated value of standard deviation S is calculated from the formula: where: NOTEWith sufficient exactness for most purposes the value of the standard deviation of a
38、series of5 results can be calculated as follows: Standard deviation S =0,430 R where: x i observations arithmetical mean of the values x i n number of observations. R The difference in value between the highest and lowest result in the series of5 tests. xBSEN2377:1989 BSI 01-2000 National appendix A
39、 The UnitedKingdom participation in the preparation of this European Standard was entrusted by the Aerospace Standards Policy Committee (ACE/-) to Technical Committee ACE/64, upon which the following bodies were represented: British Plastics Federation Ministry of Defence Society of British Aerospac
40、e Companies Limited National appendix B The British Standards corresponding to the European Standards referred to in the text are identical in number and title with those given inclause2 with the exception ofEN62, for which the corresponding British Standard isBS2782 “Methods of testing plastics” Pa
41、rt10: Method1004 “Standard atmospheres for conditioning and testing” (content identical).BS EN 2377:1989 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 Eu
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