1、AECMA STANDARD NORME AECMA AECMA NORM prEN 3475-5 1 O Edition P 1 May 1997 ICs : PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA) Gulledelle 94 - B-1200 BRUXELLES - Tel. (32) 2 775 81 10 - Fax. (32) 2 775 81 11 ENGLISH VERSION Aerospace series Cables, electrical, aircraft use Te
2、st methods Part 510 : Tensile strength and elongation of extruded insulation, sheath and jacket material Srie arospatiale Luft- und Raumfahrt Mthodes dessais Prfverahren Cbles lectriques usage aronautique Partie 510 : Tenue mcanique et longation du materiau isolant extrud, des matriaux du revtement
3、et de la gaine extrieure Elektrischen Leitungen fr Luftfahrt Verwendung Teil 510 : Zugfestigkeit und ReiBdehnung von extrudierten Isolierungen, Schutzhllen und Mnteln This “Aerospace Series“ Prestandard has been drawn up under the responsibility of AECMA (The European Association of Aerospace Indust
4、ries). 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 countries. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an ex
5、tent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and signature of the AECMA Standard Checking Centre INPS) and formal agreement of the Official Services of the Member countries it will be submitted as a draft European
6、Standard to CEN (European Committee for Standardiza tion) for formal vote. I Nota - Extra copies can be supplied by B.N.A.E. - Technopolis 54 - 199, rue Jean-Jacques Rousseau - 921 38 ICCY-LES-MOULINEAUX CEDEX Comments should be sent within six months after the date of publication to I Edition appro
7、ved for publication I 1997-05-30 AECMA Gulledelle 94 C2 Chairman Mi Pezzetta I B-1200 BRUXELLES I I aecma 199 Page 3 prEN 3475-51 O : 1997 1 Scope This standard specifies a procedure for testing the tensile strength and elongation of extruded insulation, sheath and jacket material. It shall be used
8、together with EN 3475-100. 2 Normative references This European Standard incorporates by dated or undated reference provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subseque
9、nt amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 3475-100 Aerospace series - Cables, electrical, aircraft use - Test m
10、ethods - Part 100 : General 1) 3 Preparation of specimens See figure I. Dimensions are in millimetres. 10 Reference marks 3 2 -. 8 Figure 1 : Test specimen (dumb-bell) for testing tensile strength and elongation 3.1 General If the cable dimensions allow, a test specimen as shown in figure 1 shall be
11、 used ; otherwise the values shall be determined on a tubular sample. 3.2 Preparation of test specimens Where surfaces are smooth and round, the cable is cut along the axis of the conductor, the layer to be tested exposed and a test specimen stamped out along the axis of the conductor, using the cut
12、ting tool. Where jackets are not smooth, the test specimen is cut in the direction of the wires. 1) Published as AECMA Prestandard at the date of publication of this standard Previous page Page 4 prEN 3475-51 O : 1997 3.3 Preparation of tubular samples Tubular samples are prepared by removing the co
13、mponents not to be tested. The conductor may be stretched to facilitate removal. 3.4 Determination of cross-section For test specimens, the cross-section is calculated from the width and the minimum thickness in the area between the reference marks. For tubular samples, the cross-section is calculat
14、ed, either using the following formula : where : A = cross-section in millimetres D i = mean value of external diameter in millimetres to two decimal places = mean value of wall thickness in millimetres to two decimal places or by the weighing method and calculation by the following formula : 1000 x
15、m crxL A= where : A= m= o= L= cross-section in millimetres weight of sample in grammes to three decimal places density of material in grammes per cubic centirnetre to three decimal places length in millimetres to one decimal place 4 Apparatus Tensile testing machine Cutting tool for test specimens (
16、dumb-bells as shown in figure 1 Analytical balance accurate to f 0,l mg 5 Method To measure the elongation at break, two reference marks are made 10 mm apart on the test pieces. The test shall be performed at ambient temperature. The pulling speed shall be (250 k 50) mm/min, unless otherwise specified in the product standard. Samples which break at the clamps themselves and show markedly lower values are excluded from the evaluation. 6 Requirements The mean values of a minimum of 4 tests shall comply with the values specified in the product standard.
