1、STD-AECMA PREN 2bb7-q-ENGL 399b 1032311 0032818 4T5 Edition approved for publication AECMA STANDARD NORME AECMA AECMA NORM C7 Chairman Comments should be sent within six months after the date of publication to prEN 2667-4 Edition P 1 November 1996 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE I
2、NDUSTRIES (AECMA) Gulledelle 94 - 8-1200 BRUXELLES - Tel. (32) 2 775 81 10 - Fax. (32) 2 775 81 11 ICs : Descriptors : ENGLISH VERSION Aerospace series Non-metallic materials Foaming structural adhesive films Test methods Part 4 : Vertical slump Srie arospatiale Matriaux non-mtalliques Adhsifs struc
3、turaux expansibles en film Mthodes dessai Partie 4 : Ecouiement vertical Luft- und Raumfahrt Nichtmetallische Werkstoffe Strukturelle Expansionsklebstoffe in Filmform Prfverfahren Teil 4 : Standvermgen in senkrechter Auftragslage This “Aerospace Series Prestandard has been drawn up under the respons
4、ibility 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 this Pr
5、estandard, the technical content shall not be changed to an ex tent that interchangeability is affected, physically or functionall y, without re-iden tifica tion of the standard. After examination and signature of the AECMA Standard Checking Centre (NPSI and formal agreement of the Official Services
6、 of the Member countries it will be submitted as a draft European Standard to CEN (European Committee for Standardization) for formal vote. 1996-1 1-29 AECMA Gulledelle 94 6-1 200 BRUXELLES Mr Wright I I aecma 19s STD=AECMA PREN 2bb7-4-ENGL 377b 3032313 0032837 333 = Page 3 prEN 2667-4 : 1996 1 Scop
7、e This standard defines the test method for determining the extent of slump of a foaming adhesive film placed in a vertical position, after application of the specified cure cycle. 2 Normative references EN 2048 Aerospace series - L-section aluminium alloy extrusions - Dimensions 1) EN 2090 Aerospac
8、e series - Aluminium alloy 2024-T3 - Clad sheets and strips - 0,4 mrn I a I 6 rnm 1) EN 2321 Aerospace series - Aluminium alloy 2024-T3 - Bars and sections - a I 150 mm 1) EN 2334 Aerospace series - Acid chromate pickling of aluminium and aluminium alloys 1) 3 Apparatus and auxiliary equipment Air c
9、irculating oven, programmable or controllable when conducting the curing cycle, with an accuracy of f 2 oc. Micrometer, with an accuracy within 0,Ol mm. Desiccator. 4 Definition For the purposes of this standard, the following definition applies : Slump : Foaming adhesives when cured in a vertical p
10、osition may be of thicknesses appreciably different between the high and low parts. This thickness difference is called slump. 5 Principle The principle of the test is to reproduce curing in the vertical position, by bonding of the adhesive to a sheet maintained vertically by means of a reusable ang
11、le section. NOTE : This method is representative of the behaviour of foaming films, in the production of a sandwich panel including honeycomb to honeycomb and honeycomb to sheet vertical joints. 1) Published as AECMA Standard at the date of publication of this standard Previous page is blank STD*AEC
12、MA PREN 2bb7-q-ENGL 177b 1012311 0032820 053 W Page 4 prEN 2667-4 : 1996 6 Test assembly, test specimens 6.1 Test assembly The test assembly shall be prepared in conformity with figure 1. 6.1 .l Materials The backup sheet shall be made from aluminium alloy 2024-T3 in accordance with EN 2090, approxi
13、mately 1,6 mm thick. The piece of angle section shall be selected per EN 2048 - 40 mm x 40 mm x 4 mm, or machined in a bar per EN 2321, about 80 mm long. 6.1.2 Surface preparation The backup sheet before bonding shall be either degreased with an appropriate solvent in the vapour phase or pickled as
14、per EN 2334, unless otherwise specified in the material standard. A primer, if specified, shall be then applied on the backup sheet in accordance with the manufacturers instructions and the material standard. 6.1.3 Bonding The application of the foaming adhesive film and the curing shall be carried
15、out in accordance with the adhesive manufacturers instructions and the material standard. The backup sheet is temporarily clipped to the back of the reusable angle section support with a suitable clipping device and in conformity with figure 1. A sample of the adhesive film 35 mm x 60 mm shall then
16、be unrolled on the backup sheet as per figure 1, so as to avoid trapping air bubbles between the film and the backup sheet. Place the angle section/backup sheet/film unit on a flat surface coated with a suitable release agent and the assembly thus produced is placed in the air circulating oven. The
17、heat-up rate shall range from 1 OC/min to 6 OC/min and shall be monitored and recorded using a thermoelectric couple placed on the vertical flange of the angle section as per figure 1. At the end of the cure cycle, cool in a desiccator until it reaches ambient temperature. 6.2 Test specimens Remove
18、the clipping device and disassemble to obtain the test specimen as per figure 2. A minimum of three test specimens shall be made for each test. 7 Expression of results For each test specimen the thicknesses a and b are he mean of three measuremen s taken at the three points at lines A and B shown in
19、 figure 2 : a, and 6, (the line A being situated at 6 mm from the upper limit of the adhesive and B being the line of maximum thickness of the foamed adhesive after curing). All the thicknesses shall be expressed in millimetres. STD-AECMA PREN 2bb7-Y-ENGL 399b W 1UL23Ll 0032823 T9T M Page 5 prEN 266
20、7-4 : 1996 Calculate the slump for each test specimen as follows : S = b-a Calculate the average slump for the series of test specimens. 8 Designation EXAMPLE : Number of this standard 9 Test report It shall include the following : - reference to this standard ; - complete identification of the foam
21、ing adhesive and primer if any, including the type, name and address of the manufacturer, date of manufacture, batch number and material standard number ; - storage conditions of the foaming adhesive before curing (temperature, humidity) ; - information on the surface preparation of the backup sheet
22、 before bonding ; - processing and curing conditions (equipment, heat-up rate, curing temperature, duration and record of temperature) ; - number of test specimens ; - individual test results (thickness and Slump) ; - information on each test specimen : result S of the slump test ; - average slump o
23、f the series of test specimens ; - any deviation from this standard in detail ; - date of test and signature. STD-AECMA PREN 2bb7-4-ENGL L79b 9 LOL23LL 0032822 72b H Page 6 prEN 2667-4 : 1996 Dimensions in millimetres Backup sheet Thermoelectric couple I 60 Figure 1 : Test assembly before curing I I 6 rnm from top edge b, = max. thickness Figure 2 : Thickness measurement on test specimen
