1、AECMA STANDARD NORME AECMA AECMA NORM Edition approved for publication 2000-01 -31 _- _ prEN 3745-51 2 Edition P I January 2000 Comments should be sent within six months after the date of publication to AECMA Gulledelle 94 8-1200 BRUXELLES PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIE
2、S (AECMA) Gulledelle 94 - B-1200 BRUXELLES - Tel. (+32) 2 775 81 1 O - Fax. (+32) 2 775 81 11 ICs: 49.060 Descriptors: Aerospace industry, aircraft equipment, cable, fibre optic, optical fibres, test methods ENGLISH VERSION Aerospace series Fibres and cables, optical, aircraft use Test methods Part
3、512: Flexure endurance Srie arospatiale Fibres et cbles optiques usage aronautique Mthodes dessais Partie 51 2: Rsistance la flexion Luft- und Raumfahrt Faseroptische Leitungen fr Luftfahrzeuge Prfverfahren Teil 512: Biegefestigkeit This “Aerospace Series“ Prestandard has been drawn up under the res
4、ponsibility 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 countries. Subsequent to the publication of th
5、is 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 signature of the AECMA Standard Checking Centre (NPS) and formal agreement of the Official Service
6、s of the Member countries it will be submitted as a draft European Standard to CEN (European Committee 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-MOULINEAUX CEDEX C2 Chairman Mr Pezzetta I I
7、 aecma 2000 STD*AECMA PREN 37q5-512-ENGL 2000 U 1UL231rL 00L7b20 ALiB Page 3 prEN 3745-512: 2000 1 Scope This standard specifies a method for testing flexure endurance of the cable when it is subjected to alternating flexing. 2 Normative references This European Standard incorporates by dated or und
8、ated reference provisions from other publicatins. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated and undated references, subsequent amendments to or revisions of any of these publications apply to this European Standard
9、 only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 2591 -1 O0 Aerospace Series - Elements of electrical and optical connection - Test methods Part 100: General 1) EN 3745-100 Aerospace series - Fibres and cable
10、s, optical, aircraft use - Test methods - Part 100: General 2) EN 3745-201 Aerospace series - Fibres and cables, optical, aircraft use - Test methods - Part 201: Visual examination 3) EN 3745-301 Aerospace series - Fibres and cables, optical, aircraft use - Test methods - Part 301: Attenuation 3) 3
11、Preparation of specimens 3.1 The specimens shall be prepared as specified in EN 3745-100. 3.2 The following details shall be specified if not already included in the product standard: - type of specimen; - number of specimens if different of 3; - length if not 1 m; - mass M value if not 300 g; - dia
12、meter D of mandrels if not 20 times the cable diameter; - static bend radius; - maximum permissible variation of attenuation; - number of cycles. 1) In preparation at the date of publication of this standard. It will supersede EN 2591. 2) In preparation at the date of publication of this standard 3)
13、 Published as AECMA Prestandard at the date of publication of this standard prN 3745-512: 2000 4 Apparatus and installation of specimens The apparatus shall comprise: - a Light Launch System (LLS) as defined in EN 2591-100; - a Light Detector System (LDS) as defined in EN 2591-100; - a test fixture
14、capable of applying the flexure endurance test. A typical arrangement is shown in figure I. The rotation speed shall be a uniform rate of (18 k 2) cyclesmin 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
15、. The space between mandrels is equal to the maximum diameter of the tested cable. The apparatus shall be fitted with a counter. Dimensions are in millimetres. E r Centre of L Mandrels (0D) Cable 4 Min. static bend radius 7 T- 1 LLS 1 LDS 1- Figure 1 STD-AECriA PREN 37q5-5LZ-ENGL 2000 m L0123Ll 00L7
16、b22 b10 Page 5 prEN 3745-512: 2000 5 Method 5.1 Procedure The attenuation shall be monitored throughout the test in accordance with EN 3745-301 method C. Install the specimen on apparatus. Apply the specified load M to optical cable. Perform a preliminary run and if necessary adjust the distance bet
17、ween mandrels and attached load to avoid resonance effects. Connect the end specimen to LLS and LDS, Zero the LDS to obtain a reference level. Reset the counter. Perform the specified number of cycles. 5.2 Req u i rernents Examine the test specimen for damage in accordance with EN 3745-201: Visual examination. The change in attenuation shall be less than the specified value.
