1、AECMA STANDARD NORME AECMA AECMA NORM Edition approved for publication Comments should be sent within six months prEN 2591 -420 Edition P 1 February 2005 Electrical Domain PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES - STANDARDIZATION 4 $fqpb 7 Lg -_ - $fib,* k6-d Gulledelle 94 - 8-
2、1200 Brussels -Tel + 32 2 775 8110 - Fax + 32 2 775 811 1 - www aecma-stan org ICs: 49.060 Will supersede EN 2591-420:2001 Descriptors: ENGLISH VERSION Aerospace series Elements of electrical and optical connection Test methods Part 420: Mechanical strength of rear accessories Organes Srie arospatia
3、le Luft- und Raumfahrt Mthodes dessais Partie 420 : Tenue mcanique des accessoires arrire de connexion lectrique et optique Elektrische und optische Verbindungselemente P rfve rfa h ren Teil 420: Mechanische Festigkeit der rckseitigen Zubehrteile This %Aerospace Series“ Prestandard has been drawn up
4、 under the responsibility of AECMA-STAN (The European Association of Aerospace Industries - Standardization). It is published for the needs of the European Aerospace Industry. It has been technically approved by the experts of the concerned Domain following member comments. Subsequent to the publica
5、tion 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 review by users and formal agreement of AECMA-STAN, it will be submitted as a draft Euro
6、pean Standard (prEN) to CEN (European Committee for Standardization) for formal vote and transformation to full European Standard (EN). The CEN national members have then to implement the EN at national level by giving the EN the status of a national standard and by withdrawing any national standard
7、s conflicting with the EN. 28 February 2005 after the date of publication to AECMA-STAN I I Copyright 2005 O by AECMA-STA1 Page 2 prEN 2591-420:2005 Foreword This standard was reviewed by the Domain Technical Coordinator of AECMA-STANS Electrical Domain. After inquiries and votes carried out in acco
8、rdance with the rules of AECMA-STAN defined in AECMA-STANS General Process Manual, this standard has received approval for Publication. Contents Page 1 Scope 3 2 Normative referen ces 3 3 Preparation of specimens 3 4 Apparatus 3 5 Method 3 6 Requirements 6 Page 3 prEN 2591-420:2005 1 Scope This stan
9、dard specifies a method of determining the mechanical strength of rear accessories used on elements of electrical and optical connection subjected to bending, tensile and torsional forces. It shall be used together with EN 2591-100. 2 Normative references The following referenced documents are indis
10、pensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 2591-100, Aerospace series - Elements of electrical and optical connection - Test methods
11、- Part 100: General. EN 2591 -1 01, Aerospace series - Elements of electrical and optical connection - Test methods - Part 101: Visual examination. 3 Preparation of specimens Unless specified in the technical specification, the following details shall be stated: - mounting and locking of specimens;
12、- for phase A, bending moment; - for phase B, tensile force; - for phase C, torsional moment; - for phase D, tightening torque; - requirements. 4 Apparatus - Equipment for applying and measuring the bending, tensile, torsional forces and torques - Fixture simulating the rear part of a connector 5 Me
13、thod The mounted specimens shall be subjected to the following test sequence unless otherwise stated. Dummy shells may be used. 1) Published as AECMA Prestandard at the date of publication of this standard. Page 4 prEN 2591-420:2005 a) Phase A: bending test With the specimens placed horizontally in
14、the test fixture, bending moments shall be applied successively to the end of the accessory, see Figures 1, 2 and 3. The forces f, and f2 and f3 shall be increased at a rate not exceeding 20 N/s until the specified value is reached and maintained for 1 min. Figure 1 - Bending moment (straight access
15、ory) Figure 2 - Bending moment (90 accessory) Figure 3 - Bending moment (90 accessory) Page 5 prEN 2591-420:2005 b) Phase B: tensile test With the specimens placed horizontally in the test fixture, tensile force f shall be applied to the end of the accessory, see Figure 4 or Figure 5. It shall be in
16、creased at a rate not exceeding 20 N/s until the specified value is reached and maintained for 1 min. Figure 4 - Tensile force (straight accessory) Figure 5 - Tensile force (90 accessory) c) Phase C: torsion test With the specimens placed horizontally in the test fixture, the torsional moment C shal
17、l be applied to the end of the accesory, see Figure 6 or Figure 7. This force shall be increased at a rate not exceeding 20 N/s until the specified value is reached and maintained for one minute. Figure 6 -Torsional moment (straight accessory) Figure 7 -Torsional moment (90 accessory) Page 6 prEN 25
18、91-420:2005 d) Phase D: torsion test on the mating thread With the specimens placed in the test fixture, a torque shall be applied to the coupling nut at a rate of 1 f 0,1 Nm/s until the specified value is reached and maintained for one minute. 6 Requirements At the end of phase D, prior to removal, there shall be no play between the accessory and the test fixture. The untightening torque shall comply with the specified value. After removal, the specimens shall be examined visually according to EN 2591-1 01. No deformation shall be observed.
