1、STD-AECMA PREN 2bb7-3-ENGL 177b 1012311 0012804 900 AECMA STANDARD NORME AECMA AECMA NORM prEN 2667-3 Edition P 1 November 1996 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA) Gulledelle 94 - B-1200 BRUXELLES - Tel. (321 2 775 81 10 - Fax. (32) 2 775 81 11 ICs : Descriptors : E
2、NGLISH VERSION Aerospace series Non-metallic materials Foaming structural adhesive films Test methods Part 3 : Expansion ratio and volatile content Srie arospatiale Matriaux non-mtalliques Adhsifs structuraux expansibles en film Mthodes dessai Partie 3 : Taux dexpansion et taux de matires volatiles
3、Luft- und Raumfahrt Nichtmetallische Werkstoffe Strukturelle Expansionsklebstoffe in Filmform Prfverfahren Teil 3 : Expansionsgrade und Anteil an flchtigen Bestandteilen This “Aerospace Series“ Prestandard has been drawn up under the responsibility of AECMA (The European Association of Aerospace Ind
4、ustries). 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 Prestandard, the technical content shall not be changed to an
5、 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 Services of the Member countries it will be submitted as a draft Europe
6、an Standard to CEN (European Committee for Standardization) for formal vote. I Nota - Extra copies can be supplied bv E.N.A.E. - TechnoDoiis 54 - 199, rue Jean-Jacaues Rousseau - 921 38 ISSY-LES-MOULINEAUX CEDEX I Comments should be sent within six months after the date of publication to I Edition a
7、pproved for publication I 1996-1 1-29 AECMA Gulledelle 94 B-1200 BRUXELLES C7 Chairman Mr Wright aecma 19s STD-AECMA PREN Zbb7-3-ENGL L77b LOL23LL 0032805 847 Page 3 prEN 2667-3 : 1996 1 Scope This standard defines the test method for determining the expansion ratio and the volatile content in struc
8、tural foaming adhesive films. 2 Normative references EN 2090 EN 2334 Aerospace series - Aluminium alloy 2024-T3 - Clad sheet and strip - 0,4 mm I a I 6 mm 1) Aerospace series - Acid chromate pickling of aluminium and aluminium alloys 1) 3 Definitions For the purposes of this standard, the following
9、definitions apply : Expansion ratio : the increase in thickness after curing of a foaming adhesive film expressed as a percentage of its original, pre-cured thickness. Volatile content : the decrease in mass after curing of a foaming adhesive film expressed as a percentage of its original, pre-cured
10、 mass. 4 Principle The principle of the test is to measure the thickness and weigh the foaming adhesive film before and after curing on a support material. 5 Apparatus and auxiliary equipment Air circulating oven : - programmable or controllable when conducting the curing cycle ; - regulating in tem
11、perature stages of * 2 OC ; - equipped with thermoelectric couples for continuously recording the temperatures. Balance with an accuracy of 1 mg. Micrometer provided with a flat - ended probe 6 mm in diameter for thickness measurement with an accuracy of 0,Ol mm. Desiccator. 6 Test specimens A minim
12、um of three test specimens shall be made for each test and prepared in accordance with 6.2 to 6.5. 1) Published as AECMA Standard at the date of pub1icatio.n of this standard Previous page is blank Page 4 prEN 2667-3 : 1996 6. i All weighings ml and thickness measurements (a) are to be respectively
13、measured to the nearest 1 mg and 0,Ol mm. For 6.3 to 6.5 the thickness (a,) of the test specimen is the average of minimum four measurements taken from the five positions shown in figure 1 (a, a2, a3, a4, as). See figure 2 for 6.2 to 6.5. Weighing and thickness measurements 6.2 needed. Dimensions pe
14、r figure 1 - Sides ( 100 Cut out as many square samples from the width of the foaming film, as test specimens o ) mm. Do not remove their separators. -5 Weigh and measure the thickness : ml, al. Identify each sample with a reference number. 6.3 adhesive samples, with ( 120 + 51 o ) mm sides, sheet t
15、hickness 1 mm to 2 mm. Cut out as many square aluminium alloy sheets 2024-T3 in accordance with EN 2090, as Degrease these sheets with an appropriate solvent in the vapour phase or pickle as per EN 2334. Weigh and measure the thickness : m2, a2. Identify each sheet. 6.4 Place these squares in the ce
16、nter of the aluminium alloy sheets, the side with no separator in contact with the alloy, while ensuring that no air bubbles are trapped. Then remove the second separator (separator no 1 1). Weigh and measure the thickness of each separator : m 3, Remove the separators on one side only (separator nO
17、1 l of the squares of adhesive film. m 3, a 9, a 3. 6.5 Cure each test specimen, in a horizontal position with no additional pressure at the center of an air circulating oven in conformity with the material standard or in accordance with the manufacturers recommendations. The temperature shall be mo
18、nitored and recorded using a thermoelectric couple placed in contact with the sheet as per figure 1. Cool in a desiccator until it reaches ambient temperature. Weigh and measure the thicknesses : m4, a4. 7 Expression of results Calculate the expansion ratio for each test specimen as follows : NOTE :
19、 Where there is only one separator, (ai + alJ) becomes a3. Calculate the average expansion ratio of the series of test specimens. STD-AECMA PREN 2bb7-3-ENGL L79b ZOL23Zl 0012807 bZT Page 5 prEN 2667-3 : 1996 Calculate the volatile content for each test specimen as follows : ml - m; + my) - (m4 - mp)
20、 V% = x 100 ml - (mi + m3) 11 NOTE : Where there is only one separator (ml + m ) becomes m3. Calculate the average volatile content of the series of test specimens. 8 Designation EXAMPLE : Num ber of this standard - 9 Test report It shall include the following : - reference to this standard ; - comp
21、lete identification of the foaming adhesive, including the type, name and address of the manufacturer, date of manufacture, batch number and the material standard number ; - information on the surface preparation of the aluminium alloy sheets ; - processing and curing conditions (equipment, heat-up
22、rate, curing temperature, duration and record of temperature) ; - number of test specimens ; - dimensions, thicknesses and mass of each test specimen ; - individual and average values of the thicknesses recorded at the relevant points corresponding to the expansion ratio ; - individual and average v
23、alues of the masses measured corresponding to the volatile content ; - individual and average values calculated for the expansion ratio and the volatile content ; - any deviation from this standard in detail ; - date of test and signature. STD-AECMA PREN 2bb7-3-ENGL 179b H LOL23LL 0032808 55b I I I
24、2& - - -$_- - - I I I I I J i I 15 I I I t I I I I I O -I I- 9 I I I I I I I I I I I I f - - Q- I3 - - - - - - - “- - - I I 100 - Page 6 prEN 2667-3 : 1996 m Thermoelectric couple - Su bclausec 6.2 Separator 11 Foaming adhesive film Separator 1 6.3 Sheet 2024-T3 6.4 Separator 11 Separator film 1 6.5 Cured test piece Figure 2 Mass ml m2 m3 m4 Thickness al a2 a4
