1、STD.BS1 BS EN 2597-ENGL 1998 m 1624669 0723296 334 m BRITISH STANDARD AEROSPACE SERIES Carbon fibre reinforced plastics - Unidirectional laminates - Tensile test perpendicular to the fibre direction The European Standard EN 25971998 has the status of a British Standard ICs 49.025.40 BS EN 2597:1998
2、NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGI LAW STD-BSI BS EN 2597-ENGL 1998 D 162Libb9 0723297 270 BS EN 2697:1998 National foreword This British Standard is the English language version of EN 2597: 1998. The UK participation in its preparaton was entrusted to Technical Commit
3、tee ACWU, Aerospace structurai reinforced plastics, which has the responsibility to: - aid enquirers to understand the tex$ - present to the responsible internaonaVEuropean committee any enquiries on the interpretation, or proposals for change, and keep the UK interests infOIln them in the UK. - mon
4、itor related internationai and European developments and promulgate A list of organizations represented on this committee can be obtained on request to its secMary. Cross-references The British Standards which implement intedonai or European publications referred to in this document may be found in
5、the BSI Standards Catalogue under the section entitled “internationai Standards Correspondence Index“, or by using the “Find” facility of the BSI Standards Eledxonic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract Users of British Standars are res
6、ponsible 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 inside front cover, the EN title page, pages 2 to 11 and a back cover. This British Standard, having been p
7、repared under the direction of the Engineering sedor Board, was published under the authority of the Standards Board and comes into effect on 16 September 1998 Amendments issued since publication Ama No. O BSI 1998 ISBN O 680 30416 9 * * zo STDDBSI BS EN 2597-ENGL 1998 1b24bb9 0723298 107 EUROPEAN S
8、TANDARD NORME EUROPENNE EURWISCHE NORM EN 2597 July 1998 ICs 49.025.40 Descriptors: Aircraft indusiy, reinforced plastics, laminates, catbon fibres, tests, tension tests, designation English version Aerospace series - Carbon fibre reinforced plastics - Unidirectional laminates - Tensile test perpend
9、icular to the fibre direction Srie arospatiale - Plastiques renforcs de fibres de carbone - StraifiBs unidirectionnels - Essai de traction perpendiculairement la direction des fibres Lufi- und Raumfahrt - Kohlenstoftaservemt - the point corresponding to a stress calculated from FR/lO. FR is the load
10、 at failure of the specimen. 3.6 Poissons ratio ( v,) Absolute value of the ratio of the difference in strain E, to the difference in strain E, measured between FR/10 and FR/2 (see figure 2). 4 Principle The method consists of the measurement of the longitudinal and, if required, the lateral strains
11、 in the material, in relation to the load applied, during a tensile test carried out at a constant speed until failure occurs. Two types of specimen (A and 6) may be used which give significantly different results as far as mean values and scatter are concerned. It shall be specified on which type o
12、f specimen the result was obtained. 5 Apparatus 5.1 Micrometer with 6 mm diameter flat faces and accurate to f 0,Ol mm. 5.2 Testing machine, accurate to f 1 % in the load range used. 5.3 A means of recording strains, in relation to the load (extensometer or strain gauges), accurate to f 1 % in the s
13、train range used. The instrument shall not mark the specimen in a way which may cause premature failures. STDmBSI BS EN 2597-ENGL II998 II624667 0723302 468 = I Fibredirection i - w Page 5 EN 2597:1998 . 5.4 If necessary, regulated heated cabinet for tests at temperatures other than ambient, accordi
14、ng to EN 2744. 5.5 Thermocouple and recorder for tests at temperatures other than ambient. 6 Specimens The specimens shall be taken from panels prepared according to EN 2565. These panels shall have a curvature lower than the following limit: f - 5 0,002 k where: f k is the curvature, in millimetres
15、; is the reference length, in millimetres. I Figure 1: Curvature 6.1 Form and dimensions See annex A. 6.2 Number Minimum of ten NOTE: This number is necessary due to the high scatter in test results specific to this test. STDmBSI BS EN 2597-ENGL 3998 lb24bb9 O723303 3T4 Page 6 EN 2597:1998 7 Procedu
16、re 7.1 Conditioning - EN 2743 for tests in the initial state; - EN 2489 for tests after immersion; - EN 2823 for tests after exposure to humid atmosphere. 7.2 Specimen measurement 7.2.1 Type A specimens Measure the width b to f 0,Ol mm at the free length (see annex A). Make three measurements of the
17、 thickness to f 0,Ol mm across the width of the free length. h is the arithmetic mean of these three measurements. 7.2.2 Type B specimens Measure the width to f 0,Ol mm in the centre of the specimen and at two opposite points located 50 mm from the centre. b is the arithmetic mean of these three mea
18、surements. Measure the thickness to f 0,Ol mm in the centre of the specimen and at two opposite points on the specimen axis and located 50 mm from the centre. h is the arithmetic mean of these three measurements. 7.3 Tests 7.3.1 The period separating the conditioning and start of the test shall conf
19、orm to the following conditions: lests at temperatures other than ambient - 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, see EN 2489; - for humidity aged
20、specimens, see EN 2823. 7.3.2 General requirements 7.3.2.1 The specimen shall be aligned in the test machine jaws so as to avoid the introduction of any bending loads. 7.3.2.2 The specimens shall be positioned in the jaws according to figure A.3. 7.3.2.3 The load shall be applied at a constant rate
21、of jaw separation of 0,5 mm/min. 7.3.2.4 Record the strain is the width, in millimetres; is the thickness, in millimetres. 8.2 Determine the strains from the loadlstrain recording (figure 2). Secant modulus ET,* (MPa) btweem F,/10 and FR/2 F FR 2 I I I I 1 I I I I - Figure 2: Loadlstrain recording w
22、here: FR b h ( is the width, in millimetres; is the thickness, in millimetres; is the strain perpendicular to the fibre direction corresponding to FR/l O; is the strain perpendicular to the fibre direction corresponding to F,/2. STD-ES1 ES EN 2597-ENGL 1998 1624669 0723305 177 Page a EN 2597:1998 8.
23、3 Poissons ratio v, v21 = where: ( is the strain perpendicular to the fibre direction corresponding to F,/2; is the strain parallel to the fibre direction corresponding to F,/lO; is the strain parallel to the fibre direction corresponding to FR/2. 8.4 Percentage strain to failure 822 a2, = 100( - al
24、l data ensuring the traceability of the material (trade mark, identification marking, date of receipt, batch number, etc.); - all information regarding specimen preparation; - STDOBSI BS EN 2597-ENGL 1998 1624669 0723306 003 Page 9 EN 2597:1998 - specimen dimensions; - test conditions; - exposure ti
25、me at the test temperature; - load/strain recording; - ultimate tensile strength ) and mode of failure; - method of strain measurement (extensometer or strain gauges); - secant modulus ETz2) between FJ10 and F,/2; - Poissons ratio ( V2,) (if required); - percentage strain to failure (822); - individ
26、ual values, arithmetic mean and standard deviation; - any incident which may have affected the results. _ STD-BSI BS EN 2597-ENGL 1998 D Lb24bb9 0723307 T4T D Page 10 EN 2597: 1998 Annex A (normative) Form, dimensions of specimen, test assembly i7i Figure A. 1 : Specimen type A nesso.smmtolmm i , I
27、I P 14 1 Figure A2: Specimen type B Figure A3: Position of the specimen in the jaws STD=BSI BS EN 2597-ENGL I1998 m Lb24bb9 0723308 98b m Length Width Thickness l) Length of end tabs 2, Free length Projection of jaws Gripped length Page 11 EN 2597:1998 Symbol Type A Type B L 250 f 1 250 f 1 b 25 f 0
28、,5 25 f 0,5 2 f 0,2 2 f 0,2 h t 120 60 9 lo+ 1 130f 1 C 27 27 d 50f 1 t Table A.l STD.BSI BS EN 2597-ENGL 1998 Lb24bb 0723309 8L2 BS EN 2597:1998 BSI 389ChiswickHighRoad London w4 4AL BSI - British Standards Institution BSI is the independent national body responsible for preparing British Standards
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