1、 STD.AECMA PREN 3302-ENGL 2000 = 30L23LL 0038457 Tb5 AECMA STANDARD prEN 3102 NORME AECMA Edition P I AECMA NORM June 2000 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA) Gulledelle 94 - 8-1200 BRUXELLES - Tel. (+32) 2 775 81 1 O - Fax. (+32) 2 775 81 11 ICs: Descriptors: ENGLI
2、SH VERSION Aerospace series Sealants Test methods Determination of low-temperature flexibility Srie arospatiale Produits dtanchit Methodes dessai Dtermination de la flexibilit basse temprature Luft- und Raumfahrt Dichtmassen Prfverfahren Bestimmu ng der Klteflexi bilitt This “Aerospace Series“ Prest
3、andard has been drawn up under the responsibility of AECMA (The European Association of Aerospace Industries). It is published on green paper for the needs of AECMA- Members. It has been technically approved by the experts of the concerned Technical Committee following comment by the Member countrie
4、s. Subsequent to the publication of this Presfandard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and signature of the AECMA Standard Checking Centre (NPS) and fo
5、rmal agreement of the Official Services of the Member countries it will be submitted as a draff European Standard to CEN (European Cornmittee for Standardization) for formal vote. Nota - Extra copies can be supplied by B.N.A.E. - Technopolis 54 - 199, rue Jean-Jacques Rousseau - 92138 ISSY-LES-MOULI
6、NEAUX CEDEX I Comments should be sent within six months after the date of publication to I Edition approved for publication 2000-06-30 AECMA Gulledelle 94 8-1200 BRUXELLES C7 Chairman Mr Wright I I 0 aecma 20C STD-AECMA PREN 3L02-ENGL 2000 LOL23LL 0018458 TL 9 Page 3 prEN 3102: 2000 I Scope This sta
7、ndard defines the test method for the determination of the operability of a cured sealant during and after submission to a bending load at low temperatures (low-temperature flexibility). 2 Normative references This European Standard incorporates, by dated or undated reference, provisions from other
8、publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or re
9、vision. For undated references, the latest edition of the publication referred to applies. EN 2090 Aerospace series - Aluminium alloy AL-P2024- T3 - Clad sheet and strip - 0,3 mm _ a 6 mm 1) IS0 7500-1 Metallic materials - Verification of static uniaxial testing machines - Part 1: Tensionlcompressio
10、n testing machines - Verification and calibration of the force-measuring system Rubber, vulcanized - Determination of the effect of liquids IS0 1817 3 Defi ni tions For the purpose of this standard the following definition apply: Low-temperature flexibility is the resistance of a sealant to cracking
11、 when submitted to a bending load at low temperatures using the test equipment as described in 5.1. 4 Principle of the method The sealant is applied on a strip of material (substrate). After curing of the sealant, the test pieces are directly and/or after exposure to the test media submitted to a be
12、nding test at low temperatures. Following this bending test, the test pieces are visually inspected in order to detect any cracking. 5 Apparatus and accessories 5.1 Apparatus - Tensile testing machine (suitable for tensile and compression tests) in accordance with IS0 7500-1, category 1, allowing fo
13、r a speed of 960 mmlmin; - mounting device - adapted to the tensile testing machine - for clamping of test pieces. The mounting device shall ensure the clamping of the test piece sideways from the sealant over a length of 75 mm. Installations allowing for the mounting of several test pieces simultan
14、eously may also be used (an example of such a device is given in figure 1); - load application device (adapted to the traverse of the tensile tesing machine); - cold chamber (adapted to the above-mentioned tensile testing machine, in which the required test temperature can be set (temperature tolera
15、nce: I 1 OC); - oven with forced aeration (temperature tolerance: k 1 OC); - spatula. 1) Published as AECMA Prestandard at the date of publication of this standard Page 4 prEN 3102: 2000 STDmAECMA PREN 3L02-ENGL 2000 E 1012311 0018459 838 I Mounting device Material strip n I I i Free motion: +: 20 m
16、m (measured at the end of the test plate corresponding to approx. it 15“) Plate thickness: 1 .O mm Figure 1: Example of testing device 5.2 Accessories - cleaning agent, e.g. ethyl acetate; - material strips (substrate) in material according to EN 2090, unless otherwise specified in the material stan
17、dard; - test fluid no I, in accordance with IS0 1817. 6 Test pieces 6.1 1,0 mm x 70 mm x 150 mm Dimensions of material strips (substrates) 6.2 Shape and manufacture The test pieces shall be manufactured using material strips as per 6.1. Immediately prior to the manufacture of the test pieces, the ma
18、terial strips (substrates) shall be cleaned and, if required by the material standard, a primer shall be applied. Then a (2,5 k 0,Z) mm thick coat of sealant shall be applied over a length of 100 mm and a width of 40 mm by means of a spatula on one side only and in the middle of the material strip (
19、substrate). NOTE: An open mould may be used for the manufacture of test pieces. The manufacture of test pieces shall be completed within the application time. 6.3 Curing and exposure methods The test pieces shall be cured in accordance with the material standard and, if required, exposed according t
20、o the relevant method as defined in table 1. Testing or cooling to test temperature shall begin within I O min after removal from the relevant test medium. - STD-AECMA PREN 3302-ENGL 2000 LO32333 0038460 55“ E Page 5 prEN 3102: 2000 Medium Table I : Exposure conditions Temperature Time Method A B C
21、D dry heat dry heat test fluid no 1 test fluid no I test fluid no 1 dry heat dry heat dry heat without exposure (95 f 1) oc (120 f I) OC (60 f 1) OC followed by (70 f I) “C followed by (80 f 1) “C followed by 6 cycles a at (130 f I) “C (160 f I) OC (180 f 2) OC (48 f 2) h 7dk2h (120 i 2) h (60 f 2)
22、h (6 f 0,25) h (4 f 0,25) h (40 f 5) min. (60 I 5) min. a new cycle with an exposure at 130 OC After each cycle the test pieces shall be cooled to 40 “C min. at a temperature of (23 I 2 ) OC, before starting a 6.4 Number Unless otherwise specified in the technical specification, two test pieces shal
23、l be used for each test and for each exposure. 7 Procedure The test piece shall be mounted in the clamping device over a length of 75 mm, avoiding any contact with the sealant. The temperature of the cold chamber shall be lowered to the temperature specified in the relevant material standard (unless
24、 otherwise specified: (- 55 rr 3) OC), and maintained for 2 h, following this the test piece shall be submitted to 130 flexure cycles of i 20 mm (measured at the end of the test plate; this corresponds to an angle of f 15“). The test speed shall be 960 mm/rnin., so that one cycle is completed within
25、 5 s. On completion of the bending test, the test pieces shall be brought to a temperature of (23 f 2) OC and the sealant visually inspected in order to detect any cracks, detachment or other damage. 0 Design at on EXAMPLE: Description block Identity block LOW-TEM PERATU RE FLEX1 B ILITY Number of t
26、his standard Method of exposure (see table 1) STD-AECMA PREN 3102-ENGL 2000 S 3032333 0038463 496 E Page 6 prEN 3102: 2000 9 Evaluation Evaluation of whether or not cracking, detachment or other damage has occured. IO Test report The test report shall include with reference to this standard: type an
27、d designation of product tested; number of production batch and date of manufacture; material used and conditioning of the material strip (substrate); curing conditions and, if required, the type of medium exposure; test temperature; number of test, test pieces; test result; conditions deviating from this standard or specifically agreed; date of test; department and person responsible.
