1、AECMA PREN2329 = = 83 U 101231L - 000291b b W = = = = pr E N2329 A.E .C.M.A. STANDARD A.E.C.M.A. NORM NORME A.E.C.M.A. Edition 1 February 1983 ENGLISH VERSION TEST METHOD FOR THE DETERMINATION OF MASS PER UNIT AREA OF WOVEN TEXTILE GLASS FIBRE FABRIC PREIMPREGNATE AEROSPACE SER I ES METHODE DESSAI P
2、OUR LA DETERMINATION LUFT- UND RAUMFAHRT DE LA MASSE SURFACIQUE SERIE AEROSPATIALE PRFVERFAHREN ZUR BESTIMMUNG VOR IMPRG NI ERTEM G LASFI LAMENTGEWEBE DES TISSUS DE VERRE TEXTILE PREIMPREGNES DER FLCHENBEZOGENEN MASSE VON This industrial standard for the aerospace sector has been drawn up under the
3、responsibility of AECMA (Association Europenne des Constructeurs de Matriei Arospatial). It is published on yell0 w paper in three equivalent versions (English, French, German). It will be submitted to CEN (European Committee for Standardization) as a draft European Standard. - -= Approved by The eq
4、uivalent versions in French and German languages COMITE DE NORMALISATION can be supplied by B.N.A.E., 8, rue Moreau-Vauthier of A.E C.M.A. 1982-09-1 5 92100 BOULOGNE-BILLANCOURT - FRANCE. I _- AECMA PREN2329 83 M 30L23LL 0002937 8 prEN2329 Page 2 -e 1 2 3 4 5 6 7 8 9 10 CONTENTS SCOPE AND FIELD OF A
5、PPLICATION REFERENCES DEFINITIONS PRINCIPLE OF THE METHOD APPARATUS STANDARD ATMOSPHERE FOR CONDITIONING AND TESTING SAMPLING PROCEDURE CALCULATION AND EXPRESSION OF RESULTS TEST REPORT 1 2 O 3 4 5 O 6 prEN2329 Page 3 A.E .C .M .A. STAN DARD prEN2329 TEST METHOD FOR THE DETERMINATION OF MASS PER UNI
6、T AREA OF WOVEN TEXTILE GLASS FIBRE FABRIC PREIMPREGNATE SCOPE AND FIELD OF APPLICATION This standard specifies a method for determining the mass per unit area of a woven textile glass fibre fabric preimpregnate, for aerospace use. REFERENCES EN62, Glass reinforced plastics. Stmdard atmospheres for
7、conditioning DEFINITIONS and testing. A woven textile glass fibre fabric preimpregnate with a thermosetting resin is a material purchased in the form of a synthetic resin impregnated woven textile glass fibre fabric and used or the manufacture of moulded components. PRINCIPLE OF THE METHOD Weighing
8、of test specimens of known surface area after conditioning in a specified atmosphere. APPARATUS 5.1 Balance with an accuracy of 1 mg. 5.2 Metal template of specimen. 5.3 Ancillary items such as sharp cutting knife and tweezers. STANDARD ATMOSPHERE FOR CONDITIONING AND TESTING 6.1 Conditioning 6.1.1
9、Material stored at ambient temperature Iinless otherwise specified, the necessary amount o material (see clause 7) shall be sampled and conditioned Ln the standard testing atmosphere (see clause 6.2.1) for a minimum of 2 h. . - - i AECMA PREN2327 83 U LOL23LL 0002939 L - -. prEN2329 Page 4 6.1.2 Mat
10、erial stored below ambient temperature The material, suitably packed in an airtight and solvent resistant bag to prevent moisture pick-up, shall be allowed to reach ambient temperature over a period of time according to the mass of the package. This time shall not be less than 8 h and the actual tin
11、e shall be recorded in the report. When the material has reached the ambient temperature, the necessar? amount (see clause 7) shall be sampled and conditicned in the standard testing atmosphere (see clause 6.2.1), for a minimum of 2 h, unless otherwise sDecified. 6.2 Testing 6.2.1 Standard atmospher
12、e for testing The standard atmosphere shall be in accordance with standard EN62, that is to say that the tests shall be carried out at 23 i 2OC and 50 1: 5% relative humidity. 6.2.2 Time interval between conditioning and testing After conditioning, the test shall be carried out within 6 h, unless ot
13、herwise specified, the specimen being kept in the standard atmosphere until the test is carried out. 7 SAMPLING 7.1 Test specimen The specimen shall have a length of 100 ;r 1 mm and a width of 100 2 1 mm. Other dimensions of the test specimen may be used subject to agreement between the purchaser an
14、d supplier, but having a surface area of 100 cm2 with an accuracy of rt 2%. O O 7.2 Number and distribution of test specimens Five test specimens shall be used. These shall be evenly distributed over the width and cut frim the sample diagonally (45) either across the width or along an axis inclined
15、at an angle as close as possible to the weft directian. The specimens shall not be closer than 50 mm to the edges and selveges (see figures 1 and 2). Dimensions in millimetres 50 min. I Width of woven textile glass fabric 1 r 4 FIGURE 1 - Example of diagonal positioning of Pest specimens on woven te
16、xtile glass fabric sample across the width Dimensions in millimetres FIGURE 2 - - 50 min. Warp yarns direction 50 min. 1 50 min. 4 I- Width of woven textile glass fabric Example of diagonal positioning of test specimens on woven textile glass fabric sample along an axis inclined at an angle as close
17、 as possible to the weft direction ,- ,- AECMA PREN2329 83 1012311 O002921 T -4 I prEN2329 Page 6 8 PROCEDURE Cut five specimens from a conditioned sample in accordance with clause 6.1, using the appropriate template (see clause 5.2). Weigh each specimen with its separating film to the nearest mg (m
18、l) q). Remove the separating film and reweigh this to the nearest mg 9 CALCULATION AND EXPRESSION OF RESULTS The mass per square metre for each test specimen is calculated from the formula : where : m = the mass per unit area, in g/m , ml = the mass of the specimen plus separating film, in g, m2 = t
19、he mass of the separating film, in g. - - 2 Calculate the arithmetic mean of the values obtained for m , to the nearest g/m2. 10 TEST REPORT The test report shall include the following information : 10.1 Number of this standard, 10.2 Reference to-the type of preimpregnate, with comPlete description, 10.3 Dimensions of specimens if these differ from clause 7.1, 10.4 The actual time used for the preconditioning, 10.5 The individual mass values, 10.6 The arithmetic mean value of the mass per square metre, 10.7 Observations on any circumstances liable to influence the results.
