1、I- - . CEN EN*K2377 89 3qOq589 0002283 8 EUROPEAN STANDARD EN 2377 NORME EUROPENNE *EUROPISCHE NORM 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 plas
2、tics 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 Kunststoffe Prfverfahren zur Bestimmung der scheinbare
3、n interlaminaren Scherfestigkeit This European Standard was accepted by CEN on 1 988-03-1 7. CEN members are bound to comply with the requirements of CEN Internal Regulations which stipulate the conditionsfor giving this European Standard the status of a national standard without any alteration. Up-
4、to-date lists and bibliographical referencesconcerning such national standards may be obtained on application to the CEN Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). Aversion in any otherlanguage made by translation und
5、er the responsibility of a CEN member into its own language and notified to LEN 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, N
6、etherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat : Rue Brderode 2, 8-1000 Bruxelles 0 CEN 1989 Copyright reserved to all CEN members Ref. Nr EN 237
7、7 : 1989 E CEN EN*2377 89 U 3404589 0002284 T W .-. EN 2377 Page 2 BRIEF HISTORY This draft European Standard has 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 succe
8、ssively 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 the Common CEN/CENELEC Rules, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark,
9、Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxemburg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom, z -r CEN EN*:S377 89 9 3404589 0002285 I EN 2377 Page 3 Contents 1 9 L 3 4 5 6 7 8 9 10 11 Scope and field of epplication References Definition Principl
10、e of the method Test specimens Ap p ar a tu s Conditioning Procedure Test results Calculation and expression of results Test report Annex A * CEN EN*2377 87 3404587 0002286 3 m Y - 1I)GO XPa. The span shall be adjustable. 7 Conditioning The standard atmosphere shall be in accordarice with EN 62. The
11、 test specimens shall be conditioned at (23 + 2)“C and (50 + 5)Z 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 h to the nearest 0,05 mm, respectively and adjust
12、 the span to i - 5 h + 0,l mm. V Load the specimen without bumping with a rate of the loading nose of V - (1 - + 0,l) mm/min (see figure 2). The load shall be taken as a function of time or displacement of the loading nose. - Figure 2 - Testing device -r CEN EN*2377 A9 m 3904589 0002289 9 m EN 2377
13、Page 7 9 Test results 9.1 If the specimens fail in horizontal shear approximately at the neutral fibre axis (see figure 3.e), the true interlaminar shear stress shall be calculated in accordnce with the formula in clause 10. 9.2 If test specimens fail in flexural i.e. tension or compression failure
14、of the outer surface (see figure 3.b), the results calculated by the formula in clause 10 re not true shear stresses. These results shall only be used for a comparison of test series of a same material (i.e. batch control). Single shear Multiple hear Sheer and Tension Figure 3.a - Shear modes of fai
15、lure NOTE - In the case of translucent materials an off-white colour becomes evident. Tension Compression Figure 3.b - Non-shear modes of failure _I CEN EN*Z377 87 m 3404587 0002290 5 m “- EN 2377 Page 8 i0 Calculation and expression of results The apparent shear stress shall be calculated as follow
16、s : 3 F 4 b.h -I= - where : = 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 Q a . 11 Test report The test report shall include the following informations : 11.1 Number of this standard, brand, i
17、dentification 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 loading nose and supports. 11.5 A graph representing the load measured
18、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 broken in shear a full description of type of failure shall be given wit
19、h 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 if deviating from this standard, 11.9 Observations on any circumstances
20、 liable to influence the results. o .I I a L.5 CEN ENm2377 87 3404584 O002243 7 = EN 2377 Page 9 The estimated value of standard deviation S is calculated from the formula : i=n i=1 e - (X - Xi)2 n-1 s= O Annex A Determination of the estimated value of standard deviation where : ob serva t ions i X
21、- i x . arithmetical mean sf the values x n number of observaflgns. NOTE - 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 B where : . R The difference in value between the highest an
22、d lowest result in the series of 5 tests, I -e National appendix A The United Kingdom 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
23、Plastics Federation Ministry of Defence Society of British Aerospace Companies Limited British Standard EN 2377 : 1989 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 in clause 2 with the exc
24、eption 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). CEN EN*2377 B9 W 3qOLI589 0002293 O Amd. No. This British Standard, having been prepared under the directi
25、on of the Aerospace Standards Policy Committee, was published under the authority of the Board of BSI and comes into effect on 30 November 1989 O British Standards Institution, 1989 ISBN O 580 17743 2 The following BSI references relate to the work on this standard: Committee reference ACE/64 Draft
26、for comment 88/70403 DC . . Date of issue Text affected British Standards Institution. Incorporated by Royal Charter, BSI is the independent national body for the preparation of British Standards. It is the UK member of the International Organization for Standardization and UK sponsor of the British
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29、ion in writing of BSI. This does not preclude the free use, in the course of British Standard EN 2377 : 1989 implementing the standard, of necessary details such as symbols and size, type or grade designations. Enquiries should be addressed to . the Publications Manager, BSI, Linford Wood, Milton Ke
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34、aken. 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 Belgium Denmark Finland France Germany Greece Iceland Ireland I
35、taly Luxemburg Netherlands Norway Portugal Spain Sweden Switzerland United Kingdom Oesterreichisches Normungsinstitut Institut belge de normalisation Dansk Standardiseringsraad Suomen Standardisoimisliito, r.y. Association francaise de normalisation Deutsches Institut fr Normung e.V. Hellenic Organi
36、zation for Standardization Icelandic Council for Standardization National Standards Authority of Ireland Ente Nazionale Italiano di Unificazione Inspection des travails et des mines Nederlands Normalisatie-instituut Norges Standardiseringsforbund Instituto Portugus da Qualidade Instituto Espaol de Normalizacin Standardiseringskommissionen i Sverige Association suisse de normalisation British Standards Institution Amendments issued since pub.lication British Standards Institution a 2 Park Street London W1A 2BS . Telephone 01-629 9000 - Telex 266933 JC 8911 -4-1.25k-B ACE164
