1、AECMA STANDARD NORME AECMA AECMA NORM Edition approved for publication 31 August 2004 prEN 4508 Edition P 1 August 2004 Comments should be sent within six months after the date of publication to Non-metallic Material Domain AECMA-STAN ICs: Descriptors: ENGLISH VERSION Aerospace series Paints and var
2、nishes Test method for anti slip coatings Determination of the sliding friction behaviour Srie arospatiale Luft- und Raumfahrt Peintures et vernis Anstrichstoffe Mthode dessai pour peinture antidrapante au glissage avec friction Prfverfahren fr tritt- und rutschfeste Bestimmung des Gleitreibungsverh
3、altens Dtermination comportement Beschichtungen This “Aerospace Series“ frestandard has been drawn up 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
4、 approved by the experts of the concerned Domain following member comments. Subsequent to the publication of this frestandard, the technical content shall not be changed to an extent that interchangeabilify is affected, physically or functionally, without re-identification of the standard. After exa
5、mination and review by users and formal agreement of AECMA-STAN, it will be submitted as a draft European 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 natio
6、nal level by giving the EN the status of a national standard and by withdrawing any national standards conflicting with the EN. I I Copytight 2004 O by AECMA-STA1 Page 2 prEN 4508:2004 Foreword This standard was reviewed by the Domain Technical Coordinator of AECMA-STANS Non-metallic Material Domain
7、. After inquiries and votes carried out in accordance with the rules of AECMA-STAN defined n AECMA- STANS General Process Manual, this standard has received approval for Publication. Page 3 prEN 4508:2004 O Introduction Not applicable 1 Scope This standard specifies the procedure for determination o
8、f the sliding friction behaviour of an anti slip coating. 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
9、. 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 references the latest edition of the publication referred to applies (including amendments). EN 2090, AMS 3200
10、, ASTM-D 471, Standard test method for rubber proberty - Effect of liquids 3, Aerospace series -Aluminium alloyAL-P2024 - T3 - Clad sheet and strip - 0,3 mm 5 a 5 6 mm Butadiene acrylonitrile (NBR) rubber petroleum-base hydraulic fluid resistant 55 - 65 2, 3 D ef i n it i on s 3.1 Sliding friction c
11、oefficient p The sliding friction coefficient IJ is the ratio between the sliding friction load achieved by the specific test and the mass of the sliding block. 4 Principle of the method Not applicable 5 Designation of the method Not applicable 6 Apparatus 6.1 diagram. The tensile test machine shall
12、 allow a speed of 500 mm/min. Calibrated tensile test machine accurate within 1 %, equipped with facilities to record load path 6.2 coated specimen according to clause 7 is fixed or clamped (see Figure 1). Plane support plate from constructional steel, reinforced with angle steel profiles, to which
13、the 6.3 Sliding block with a mass of 5 kg and a base of 100 mm x 50 mm. Five strips of NBR rubber according to AMS 3200 and 5 mm width shall be symmetrically arranged in longitudinal direction of the sliding block considering a distance between the strips of 5 mm. For adhesive bonding of the strips
14、to the sliding block an adequate adhesive shall be used (see Figure 1). 1) 2) 3) Published as AECMA Prestandard at the date of publication of this standard Published by: Society of Automotive Engineers, Inc. (SAE), 400 Commonwealth Drive, Warendale, PA15096-001 USA Published by: American Society for
15、 Testing and Materials (ASTM), 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, USA Page 4 prEN 4508:2004 6.4 angle of 90“ (see Figure 1). Smoothly running deflection pulley with diameter 130 mm fixed to the plane support plate with an 6.5 Cable which connects the sliding block via the defle
16、ction pulley with the tensile test machine. 7 Test specimen 7.1 Manufacture of test panels Aluminium alloy according to EN 2090 with the dimension 500 mm x 150 mm x 15 mm. 7.2 Preparation of test specimens 7.2.1 7.2.2 Apply a sufficient quantity of the well stirred coating material i.a.w. the releva
17、nt material specification, so that a dry film thickness of maximum 125 pm is achieved. 7.2.3 Cure the coating i.a.w. the relevant material specification. Pretreatment and coating of the panel i.a.w. the relevant material specification. 7.3 Number of specimens Three specimens shall be tested with thr
18、ee tests on each test specimen. 8 Procedure 8.1 brush on the coated surface. Clamp each test specimen to the plane support plate. Apply (IRM-oil No. 903) ASTM-D 471 by 8.2 Place the sliding block on the test specimen end opposing the deflection pulley. 8.3 tensile machine. Pull the sliding block ove
19、r the total length of the test specimen at a speed of 500 mm/min using the 8.4 plane support plate. Perform this test three times for each test specimen without removing the test specimen from the 8.5 Record the frictional load as a function of the path. 9 Presentation of the results 9.1 Friction co
20、efficient Divide the path axis of the load -path diagram into 15 sections and read the frictional load values related to the respective sections. The mean value calculated from these values, excluding the initial and the final value of the diagram, is the sliding friction load based on the specific
21、test. Calculate the corresponding sliding friction coefficient as follows: where: F m g gravity (9,81 m/s2). sliding friction load based on the specific test (N); mass of the sliding block (kg); Page 5 prEN 4508:2004 9.2 Requirement The minimum mean value of the sliding friction coefficient shall be
22、 as specified in the relevant material specification. 10 Test report The test report shall refer to this standard and include the following: 10.1 10.2 10.3 10.4 10.5 10.6 Complete identification of the tested material. All details about the preparation of specimens. Date of test, facility and identi
23、fication of individuals performing the test. Equipment, method and test parameters used. Individual test results and calculations. Any incident which may have affected the results. All dimensions in millimetres Key 1 Thickness = 1,5 2 Mass=5 kg 3 Sliding block 4 Coated specimen 5 Elastomer strips 6 Deflection pulley 7 Diameter = 130 8 Support plate 9 Details of sliding block lower sutface Figure 1 - Test arrangement
