EN 4864-2020 pdf download.Aerospace series – Environmental testing – High dynamic abrasion, mar, scratch and punch test in cabin interior.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements 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 4860, Aerospace series — Environmental testing — Test Xb: Abrasion of markings, letterings, surfaces and materials caused by rubbing offingertips and hands 1)
EN 60068-1, Environmental testing — Part 1: General and guidance
EN ISO 2409, Paints and varnishes — Cross-cut test
ISO 4649, Rubber, vulcanized or thermoplastic — Determination of abrasion resistance using a rotating cylindrical drum device 2)
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• ISO Online browsing platform: available at http://www.iso.org/obp
• I EC Electropedia: available at http://www.electropedia.org/ 4 General description
The surface under test shall be once or repeatedly stressed by the rubbing, scratch, abrasion or punch movement of a test head. The test head/tip should be defined by the relevant specification in dependence of the specific test application, but should be defined in terms of material, hardness, roughness and shape as well as the movement angle to obtain reproducible test conditions. Depending on the relevant specification, an additional fabric and/or test medium could be used for testing.
The scratch movement shall start with an impact motion by lowering the tip onto the surface automatically in a reproducible fashion, and a further slide motion with one direction then the test tip shall be lifted and moved back to the initial impact point with a further one-direction slide, repeating this cyclic motion for certain times. The abrasion movement shall start with lowering the tip for the first time, followed by a reciprocating sliding motion for certain times. The punch movement shall be generated by a pneumatic cylinder with a certain force at one direction onto the sample surface.
5 Description of the test apparatus
5.1 General
An example of a suitable test apparatus is shown in the schematic drawing in Annex A. The apparatus moves the rubbing, scratch or punch tip under an angle 01900 ± 50 in a horizontal level over the surface. For scratch and abrasion test, the tip shall fall down on to the surface automatically with a certain momentum to simulate the first initial impact which often occurs in realistic conditions. Then the testing tip shall slide at a defined speed one direction with the length between 15 mm to 120 mm on the surface. This procedure shall be repeated cyclically by lifting the tip to the initial impact point then followed with the uni-direction movement. Another scenario is the tip shall slides on the surface after the initial impact with reciprocating motion for certain times.
The velocity v shall be generated by a pneumatic cylinder. The normal load shall be caused by adding dead weights onto the test head. The velocity of the cylinder and the normal force should be given in the relevant specification.
For punch tests the resulting force caused by the pneumatic cylinder should be defined as well by the relevant specification. For non-rigid test specimens the specification shall specify additional requirements (for example fixing).
Because of the universal approach for the high dynamic scratch, abrasion and punch test, the properties shall be defined by the relevant specification.
There are several suggested test heads for specific test methods, see 5.2 to 5.5.
5.2 Loading test by cargo and suitcase
Loading tests by cargo and suitcases are:
1) Edge of a radiator tank (commercially available);
2) Suitcase roller;
3) Socket/stand of a hard shell case;
4) Sharp edge of a flap box;
5) Edge of an aluminium case;
6) Edge and handle of a leather pilot case;
7) Metal lock and hinges;
8) Rubber feet.EN 4864-2020 pdf download.