1、STD-AECMA PREN 3q75-512-ENGL 1777 1012311 0013197 392 AECMA STANDARD NORME AECMA AECMA NORM prEN 3475-51 2 Edition P 1 June 1997 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA) Gulledelle 94 - 8-1200 BRUXELLES - Tel. (+32) 2 775 81 10 - Fax. +32) 2 775 81 11 ICs : Descriptors :
2、 ENGLISH VERSION Aerospace series Cables, electrical, aircraft use Test methods Part 51 2 : Flexure endurance Srie arospatiale Luft- und Raumfahrt Mthodes dessais Prfverfahren Cbles lectriques usage aronautique Partie 512 : Rsistance la flexion Elektrischen Leitungen fr Luftfahrt Verwendung Teil 51
3、2 : Wechselbiegefestigkeit This “Aerospace Series“ Prestandard 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 Techn
4、ical Committee following comment by the Member countries. Subsequent to the publication of this Prestandard, 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 signa
5、ture of the AECMA Standard Checking Centre (NPS) and formal agreement of the Official Services of the Member countries it will be submitted as a draft European Standard to CEN (European Cornmittee for Standardization) for formal vote. Nota - Extra copies can be supplied by B.N.A.E. - Technopolis 54
6、- 199, rue Jean-Jacques Rousseau - 921 38 ISSY-LES-MOULINEAUX CEDEX I Comments should be sent within six months after the date of publication to I Edition approved for publication 1997-06-30 AECMA Gulledelle 94 B-1200 BRUXELLES C2 Chairman Mr Pezzetta I I aecma 199 Page 3 prEN 3475-512 : 1997 1 Scop
7、e This standard specifies a method of testing flexure endurance of the cable when it is subjected to alternating flexing. It shall be used together with EN 3475-100. 2 Normative references This European Standard incorporates by dated or undated reference provisions from other publications. These nor
8、mative 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 revision. For undated ref
9、erences the latest edition of the publication referred to applies. EN 3475-100 Aerospace series - Cables, electrical, aircraft use - Test methods - Part 100 : General 1) 3 Preparation of specimens and principle of test Take specimens of adequate length from a finished cable and install them on appar
10、atus described hereafter. This test makes it possible to determine the resistance of the cable to cycles of repeated flexing. With the cable vertical, a cycle is defined by a rotation of 90 left, return to the vertical, rotation of 90 right and return to the vertical. The damage is detected by condu
11、ctor breakage and thus an interruption of electrical continuity between the two ends of the tested specimen. The test is normally performed on gauge 20 cables. It is carried out at ambient temperature. 4 Apparatus and installation of specimens The apparatus is described by the figure 1. It is fitted
12、 with a counter and an automatic stop device controlled by interruption of electrical continuity. The rotation speed shall be an uniform rate of 18 i 2 cycles/min. The space between mandrels is equal to the maximum diameter of the tested cable. The mandrel diameter D and weight M are specified in th
13、e product standard. 1 ) Published as AECMA Prestandard at the date of publication of this standard previous page is blank Page 4 prEN 3475-51 2 : 1997 i / center of 111 r rotation Figure 1 5 Procedure After installing a specimen and before commencing the full test, perform a preliminary run and if n
14、ecessary adjust the distance, the mandrels and the attached weight such that possible resonance effects are avoided. For the actual test, actuate the detection circuit, reset the counter and run the machine until auto shut down takes place. 6 Requirement This test shall be performed on a minimum of 3 specimens. The mean value of this test shall be greater than the value specified in the product standard. The number of cycles between the beginning of the test and the ending triggered by the detection system shall be greater than the value specified in the product standard.
