1、STD*BSI BS EN 25b3-ENGL 1997 Lb24bb9 Ob2ULbB 7bB BRITISH STANDARD AEROSPACE SERIES Carbon fibre reinforced plastics - Unidirectional laminates - Determination of the apparent interlaminar shear strength The European Standard EN 2563 : 1997 has the status of a British Standard ICs 49.040.10 NO COPYIN
2、G WITHOUT ES1 PERMISSION EXCEPT AS PERMITTED BY COPYRIGK LAW BS EN 2563 : 1997 STD-BSI BS EN 25b3-ENGL 1997 = LbZibb9 Ob201b9 BTi = BS EN 2663 : 1997 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee ACW64, Aerospace stsuct
3、ural reinforced plastics, upon which the following bodies were represented British Plastics Federation Mmstry of Defence Society of British Aerospace Companies This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the St
4、andards Board and comes into effect on 15 June 1997 O BSI 1997 Amendments issued since publication ktdNo. (Date I Text affected I I The foiiowing BSI references relate to the work on this standard Committee reference ACE64 Draft for comment 882264 DC ISBN O 680 26685 O * * rn STD*BSI BS EN 25b3-ENGL
5、 1777 m Lb24bb7 Ob20L70 5Lb m BS EN 2663 : 1997 Contents page Nationai foreword ii Committees responsible Inside front cover Foreword Specification 1 scope 2 Nonnative references 3 Defmitions 4 Principle 5 4P=tUs 6 Specimens 7 Procedure 8 Expressionof resuits 9 Testremrt 2 O BSI 1997 i STD-BSI BS EN
6、 25b3-ENGL 1797 W LbZqbbS Ob20171 452 W BS EN 2663 : 1997 National foreword This British Standard has been prepared by Technical Committee ACW64 and is the English language version of EN 2563 : 1997 Aerospace series - Carbon fibre reinforced plastics - Unidirectid iuminates - Determination of W appa
7、rent intdam.inar shear stvth, published by the European Committee for Standardization (CEN). EN 2563 : 1997 was produced as a result of intemational discussions in which the United Kingdom took an active part. Cross-references The British Standards corresponding to the European Smdards referred to i
8、n the text are identical in number and title with those given in cause 2. 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, the EN title page, pages 2 to 8, an i
9、nside back cover and a back cover. ii O BSI 1997 - STD-BSI BS EN 25b3-ENGL 1977 = lb24bb9 Ob20172 377 W EUROPEAN STANDARD NORME EROPEENNE EUROPISCHE NORM EN 2563 January 1997 ICs 49.040.10 Descriptors: aircraft industry, reinforced plastic, carbon fibre, determination, shear strength English version
10、 Aerospace series - Carbone fibre reinforced plastics - Unidirectional laminates - Determination of the apparent interlaminar shear strength Srie arospatiale - Plastiques renforcs de fibres de carbone - Stratifis midirectiomels - D h min. is the minimum thickness, in millimetres ; - h is the arithme
11、tic mean thickness h of specimens within a set (millimetres). 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
12、2489 for tests after immersion, EN 2823 for tests after exposure to humid atmosphere. 7.2 Tests 7.2.1 Determine h by calculating the arithmetic mean of three measurements of the thickness to within 0,Ol mm taken across the width at the centre of the specimen. Measure the distance between supports to
13、 within 0,l mm. Measure the width b to within 0,Ol mm at the centre of the specimen. STDmBSI BS EN 25b3-ENGL 1997 LbZLibbS Ob20177 970 .I Page 6 EN 2563:1997 7.2.2 adjusted so that : For qualification testing and in case of disagreement, the distance between supports shall be I, = (5. hi f 0,l where
14、 : i, is the distance between supports (millimetres) ; h is the arithmetic mean thickness h of specimens within a set (millimetres). 7.2.3 of the test shall conform to the following conditions : For tests at temperatures other than ambient, the period separating the conditioning and start - for spec
15、imens 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, see EN 2489 ; - for specimens subjected to humid atmosphere, see EN 2823. 7.2.4 Locate the specimen in the test fixt
16、ure, ensuring that its axis is perpendicular to the supports. 7.2.5 Load the specimen smoothly at a constant displacement rate of the loading nose of V = (1 i 0,l) 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 (PR). 8 Expression
17、 of results 8.1 The apparent interlaminar shear strength shall be calculated as follows : 3Fk 4bh 7= where : r P, b h is the apparent interlaminar shear strength, in megapascal ; is the maximum load at the moment of first failure, in newtons ; is the width of specimen, in millimetres ; is the thickn
18、ess of specimen, in millimetres. 8.2 Validity 8.2.1 If a specimen fails in shear approximately at the neutral fibre axis (see figure 21, the interlaminar shear strength is calculated in accordance with the formula in 8.1. 8.2.2. If a specimen fails in flexure or by plastic deformation (see figure 3)
19、, the result obtained by the formula in 8.1 is not a true shear stress at failure. This result may only be used for comparison with those from a series of tests related to a same material (e.g. batch control). STD*BSI BS EN 25b3-ENGL 2777 U Lb2LibbS Ob20178 807 Page 7 EN 2563:1997 Single shear Multi
20、ple shear Figure 2 4 P (NI 4 P (NI * * rn Plastic deformation Flexure A P (NI Figure 3 STD*BSI BS EN 25b3-ENGL 1777 = 1b24bb7 Ob20177 743 Page 8 EN 2563:1997 9 Test report It shall include the following : - number of this standard ; - all data ensuring the traceability of the material (trade mark, i
21、dentification marking, date of receipt 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 of 7.2.3 ; - time interval betwe
22、en conditioning and testing (see 7.2.3) ; - load 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. BS EN 2563 : 1997 BSI 389 Chiswick High Road
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