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1、BRITISH STANDARD AEROSPACE SERIES BS EN 2377:1989 Glass fibre reinforced plastics Test method Determination of apparent interlaminar shear strength This European Standard EN 2377 has the status of a British Standard. UDC 678.067.5-41:620.176:629.7 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov
2、03 01:13:11 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 2377:1989 This British Standard, having been prepared under the direction of the Aerospace Standards Policy Committee, was published under the authority of the Board of BSI and comes into effect on 30 November 1989 BSI 01-2000 The followin
3、g BSI references relate to the work on this standard: Committee reference ACE/64 Draft for comment 88/70403 DC ISBN 0 580 17743 2 Cooperating organizations The European Committee for Standardization, under whose supervision this European Standard was prepared, comprises the national standards organi
4、zations of the following Western European countries. AustriaOesterreichisches Normungsinstitut BelgiumInstitut belge de normalisation DenmarkDansk Standardiseringsraad FinlandSuomen Standardisoimisliito, r.y. FranceAssociation franaise de normalisation GermanyDeutsches Institut fr Normung e.V. Greec
5、eHellenic Organization for Standardization IcelandIcelandic Council for Standardization IrelandNational Standards Authority of Ireland ItalyEnte Nazionale Italiano di Unificazione LuxemburgInspection des travails et des mines NetherlandsNederlands Normalisatie-instituut NorwayNorges Standardiserings
6、forbund PortugalInstituto Portugus da Qualidade SpainInstituto Espaol de Normalizacin SwedenStandardiseringskommissionen i Sverige SwitzerlandAssociation suisse de normalisation United KingdomBritish Standards Institution Amendments issued since publication Amd. No.Date of issueComments Licensed Cop
7、y: sheffieldun sheffieldun, na, Fri Nov 03 01:13:11 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 2377:1989 BSI 01-2000i Contents Page Cooperating organizationsInside front cover National forewordii Brief history2 Text of EN 23773 National appendix AInside back cover National appendix BInside bac
8、k cover Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 03 01:13:11 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 2377:1989 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 vers
9、ion of EN 2377 “Aerospace series. Glass fibre reinforced plastics. Test method. Determination of apparent interlaminar shear strength”, published by the European Committee for Standardization (CEN). EN 2377 was produced as a result of international discussion in which the UK took an active part. A B
10、ritish 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 immunity from legal obligations. Summary of pages This document comprises a f
11、ront cover, an inside front cover, pages i and ii, the EN 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. Licensed C
12、opy: sheffieldun sheffieldun, na, Fri Nov 03 01:13:11 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2377 January 1989 UDC: 678.067.5-41:620.176:629.7 Key words: Aircraft industry, glass reinforced plastics, plates, test method, shear stress English v
13、ersion Aerospace series Glass fibre reinforced plastics Test method Determination of apparent interlaminar shear strength Srie arospatiale Plastiques renforcs de fibres de verre Mthode dessai Dtermination des proprits en cisaillement apparent interlaminaire Luft- und Raumfahrt Glasfaserverstrkte Kun
14、ststoffe Prfverfahren zur Bestimmung der scheinbaren interlaminaren Scherfestigkeit This European Standard was accepted by CEN on 1988-03-17. CEN members are bound to comply with the requirements of CEN Internal Regulations which stipulate the conditions for giving this European Standard the status
15、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 Standard exists in three official versions (English, French, German). A vers
16、ion in any other language made by translation under the responsibility of a CEN member into its own language and notified to CEN Central Secretariat has the same status as the official versions. CEN members are the national standards organizations of Austria, Belgium, Denmark, Finland, France, Germa
17、ny, Greece, Iceland, Ireland, Italy, Luxemburg, 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 CEN 1989 Cop
18、yright reserved to all CEN members Ref. No. EN 2377:1989 E Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 03 01:13:11 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 2377:1989 BSI 01-2000 2 Brief history This draft European Standard has been prepared by the European Association of Aerospace Manuf
19、acturers (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 AECMA, prior to its presentation to CEN. In accordance with th
20、e 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, Sweden, Switzerland and United Kingdom. Contents Page Brief histor
21、y2 1Scope and field of application3 2References3 3Definition3 4Principle of the method3 5Test specimens3 6Apparatus4 7Conditioning4 8Procedure4 9Test results4 10Calculation and expression of results5 11Test report5 Annex A Determination of the estimated value of standard deviation6 Figure 13 Figure
22、2 Testing device4 Figure 3.a Shear modes of failure4 Figure 3.b Non-shear modes of failure5 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 03 01:13:11 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 2377:1989 BSI 01-20003 1 Scope and field of application This standard defines a method for the det
23、ermination of the apparent 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 reinforce
24、d mouldings and sandwich 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 shea
25、r parallel to the layers 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 to EN 2374. 5.1 Dimen
26、sions 5.1.1 Standard specimens 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 w
27、idth and the thickness of 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 than 3 mm excessive compressive stresses may occur under the loading nose. 5.2 Position of specimens See Figure 1. 5.3 Numbe
28、r of test specimens 5.3.1 The number of test specimens shall be a minimum of 5 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 (see Figure 1, specimen A and B). When the fibres are
29、 oriented unidirectionally, the test shall be carried out in that direction only. Length 1 :(20 0,5) mm Width b:(10 0,2) mm Thickness h :(3 0,2) mm Figure 1 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 03 01:13:11 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 2377:1989 4 BSI 01-2000 6 Apparat
30、us Calibrated standard testing machine, which can be operated at a constant rate of the loading nose and in which the accuracy of measurement shall be within 1 %. The loading nose and supports shall be made from steel having a tensile strength U 1 000 MPa. The span shall be adjustable. 7 Conditionin
31、g The standard atmosphere shall be in accordance with EN 62. The test specimens shall be conditioned at (23 2) C and (50 5) % relative humidity during at least 16 h. 8 Procedure Unless otherwise specified, carry out the test at (23 2) C and (50 5) % relative humidity. Measure the dimensions of b and
32、 h to the nearest 0,05 mm, respectively and adjust the span to lV= 5 h 0,1 mm. Load the specimen without bumping with a rate of the loading nose of V = (1 0,1) mm/min (see Figure 2). The load shall be taken as a function of time or displacement of the loading nose. 9 Test results 9.1 If the specimen
33、s fail in horizontal shear approximately at the neutral fibre axis (see Figure 3.a), the true interlaminar shear stress shall be calculated in accordance with the formula in clause 10. 9.2 If test specimens fail in flexural i.e. tension or compression failure of the outer surface (see Figure 3.b), t
34、he results calculated by the formula in clause 10 are not true shear stresses. These results shall only be used for a comparison of test series of a same material (i.e. batch control). Figure 2 Testing device NOTEIn the case of translucent materials an off-white colour becomes evident. Figure 3.a Sh
35、ear modes of failure Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 03 01:13:11 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 2377:1989 BSI 01-20005 10 Calculation and expression of results The apparent shear stress shall be calculated as follows: where: 11 Test report The test report shall inc
36、lude 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. 11.4 Actual radii of the
37、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 (see Annex A) shall be recorded. 11.7 When test specimens have not been b
38、roken 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 (see Annex A) shall be recorded. 11.8 Test conditions i.e. temperature and relative humidity
39、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 first failure, in N b=Width of specimen in mm h=Thickness of specimen in mm 3 4 - - F
40、 b . h - -= Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 03 01:13:11 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 2377:1989 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: NOTE
41、With sufficient exactness for most purposes the value of the standard deviation of a series of 5 results can be calculated as follows: Standard deviation S = 0,430 R where: xiobservations arithmetical mean of the values xi nnumber of observations. RThe difference in value between the highest and low
42、est result in the series of 5 tests. x Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 03 01:13:11 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 2377:1989 BSI 01-2000 National appendix A The United Kingdom participation in the preparation of this European Standard was entrusted by the Aerospa
43、ce 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 Aerospace Companies Limited National appendix B The British Standards corresponding to the European Standards refe
44、rred to in the text are identical in number and title with those given in clause 2 with the exception of EN 62, for which the corresponding British Standard is BS 2782 “Methods of testing plastics” Part 10: Method 1004 “Standard atmospheres for conditioning and testing” (content identical). Licensed
45、 Copy: sheffieldun sheffieldun, na, Fri Nov 03 01:13:11 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 2377:1989 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on s
46、tandards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the qual
47、ity of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: 020 8996 9000. Fax: 020 8996 740
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