1、STD-AECMA PREN 2bb7-1-ENGL 177b LOL23LL OOL2L22 55T Edition approved for publication 1996-1 1-29 AECMA STANDARD NORME AECMA AECMA NORM Comments should be sent within six months after the date of publication to AECMA Guiledelie 94 B-1200 BRUXELLES prEN 2667-1 Edition P 1 November 1996 PUBLISHED BY TH
2、E EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA) Guiledelie 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 adhesives Test methods Part 1 : Tensile single-lap shear Srie arospat
3、iale Luft- und Raumfahrt Matriaux non-mtalliques Nichtmetallische Werkstoffe Adhsifs structuraux expansibles Strukturelle Expansionsklebstoffe Mthodes dessai Prfverfahren en traction im Zugversuch Partie 1 : Cisaillement recouvrement simple Teil 1 : Einfach berlappte Scherprobe This “Aerospace Serie
4、s“ Prestandard has been drawn up under the responsibility 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 c
5、ountries. Subsequent to the publication 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 signature of the AECMA Standard Checking Centre INPSI
6、 and formal agreement of the Official Services of the Member countries it will be submitted as a draft European Standard to CEN (European Committee for Standardization) for formal vote. Nota - Extra copies can be supplied by B.N.A.E. - Technopolis 54 - 199, rue Jean-Jacaues Rousseau - 921 38 ISSY-LE
7、S-MOULINEAUX CEDEX C7 Chairman Mr Wright I I aecma 1991 STD-AECMA PREN 2bb7-1-ENGL 177b LOL23L1 0012123 47b W Page 3 prEN 2667-1 : 1996 1 Scope This standard defines the test method for determining the bond strength of structural foaming adhesive films or pastes by means of tensile single-lap shear
8、specimens. This test method is suitable for comparative tests regarding the quality of a foaming adhesive when thickness is taken into account, in order to obtain maximum mechanical characteristics in relation to the expansion ratio. It preferably applies to low expansion ratios, .e. I 50 % measured
9、 according to the method EN 2667-3. For higher expansion ratios, .e. 50 %, the tube test EN 2667-2 is preferred. 2 Normative references IS0 7500-1 EN 2088 EN 2090 EN 2334 EN 2497 EN 2538 EN 2667-2 EN 2667-3 EN 3456 Metallic materials - Verification of static uniaxial testing machines - Part 1 : Tens
10、ile testing machines Aerospace series - Aluminium alloy 2014A-T4 or T42 - Clad sheets and strips - 0,4 mm I a I 6 mm l) Aerospace series - Aluminium alloy 2024-T3 - Clad sheet and strip - 0,4 mm I a I 6 mm Aerospace series - Acid chromate pickling of aluminium and aluminium alloys Aerospace series -
11、 Dry abrasive blasting of titanium and titanium alloys Aerospace series - Steel FE-PM-61 - Solution annealed and precipitation hardened - 1 240 MPa I R, I 1 310 MPa sheet a I 10 mm 2, Aerospace series - Non-metallic materials - Foaming structural adhesives - Test methods - Part 2 : Compressive tube
12、shear 2, Aerospace series - Non-metallic materials - Foaming structural adhesive films - Test methods - Part 3 : Expansion ratio and volatile content 2, Aerospace series - Titanium alloy TLP64001 - Annealed - Sheet and strip, hot rolled a I6 mm2) 3 Apparatus and auxiliary equipment 3. I Tensile test
13、ing machine The test machine shall be approved to IS0 7500-1 and so designed that the breaking load lies between 10 % and 90 % of the selected full-scale capacity. The loads shall be recorded to an accuracy of 1 %. 1) Published as AECMA Standard at the date of publication of this standard 2) Publish
14、ed as AECMA Prestandard at the date of publication of this standard Previous page is blank STD-AECMA PREN 2bb7-L-ENGL 177b LO12311 OOL2124 322 m Page 4 prEN 2667-1 : 1996 3.2 Auxiliary equipment Air circulating oven with an accuracy of f 5 OC. Heating press with an accuracy of f 3 OC. Autoclave with
15、 an accuracy of k 5 OC. Band saw. Thermqelectric couple. 4 Test panels, test specimens 4.1 Test panels The shape and the dimensions of the panels shall be in conformity with figure 1 or figure 2. Precut test panel according to figure 2 shall preferably be used for titanium alloy and steel materials
16、described in 4.1.1. 4.1 .l Materials The following materials are normally to be used : or aluminium alloy 2024-T3 in accordance with EN 2090 aluminium alloy 2014A-T4 or T42, in accordance with EN 2088. At test temperatures exceeding 150 OC, one of the following materials shall be used : corrosion re
17、sisting steel FE-PM-61, in accordance with EN 2538 titanium alloy TI-P64001, in accordance with EN 3456. 4.1.2 Surface preparation Surface preparation before bonding shall be in accordance with EN 2334 for aluminium alloys or with EN 2497 for titanium, unless otherwise specified in the material stan
18、dard. Surface preparation for steel shall be specified in the material standard. 4.1.3 Bonding Bonding of the test panels shall take place within 4 h after completion of the preliminary treatment. Otherwise, the treated surfaces of the test panels shall be coated with a protective primer. The bond t
19、hickness a, (see figure 4) of the cured foaming adhesive shall be 40 % to 50 % smaller than the final thickness after free expansion as determined in accordance with EN 2667-3. Conformance with the bond thickness to be achieved shall be ensured by the insertion of a suitable spacer made according to
20、 figure 3. The spacer avoids the flection of the upper jig due to pressure and shall be coated with release agent before use to avoid adhesion on spacer. The application of the foaming adhesive system (adhesive and primer, if necessary) as well as the curing shall be carried out in accordance with t
21、he adhesive manufacturer?s instructions and the material standard. An adhesive strip of (12,5 i 0,5) mm width shall be applied to the lower test panel. The assembly shall then be completed with the spacer and the upper test panel. Curing shall be carried out in an air circulating oven, autoclave or
22、heating press. Page 5 prEN 2667-1 : 1996 4.1.4 The final test panels shall be conditioned and tested after a storage period of at least 16 h after curing and under the following conditions. Storage of test panels after curing - temperature : (23 * 2) OC - relative humidity : (50 5) % 4.2 Test specim
23、ens 4.2.1 Cutting test specimens The cutting of the test panels into test specimens shall be done with an appropriate tool such as a band saw, in accordance with figures 4 and 5. The number of teeth and the set of the saw, as well as the feed and cutting speed shall be chosen so to minimize thermal
24、and mechanical stressing. The cuts shall be straight, parallel and perpendicular to the two edges. To cut out test panels no cooling fluid shall be used. The cut edges shall be deburred with a fine file or abrasive paper. Excess adhesive is not to be removed. Each test specimen shall be identified w
25、ith an individual reference mark so as to locate the number of the test panel from which it originated as well as its position on this panel. 4.2.2 Quantity There shall be a minimum of five individual test specimens for each test. 5 Procedure Tests shall be performed at the temperatures specified in
26、 the material standard. If the test temperature differs from the ambient temperature, the heat-up rate or the cooling rate of the test specimen shall be less than 10 OC/min. For all tests carried out at a temperature other than ambient, load shall be applied after stabilization at the specified temp
27、erature for a minimum of 10 min and a maximum of 30 min (unless otherwise specified by the supplier). For all temperatures with the exception of the ambient temperature, control of the temperature of the test specimen is carried out by means of a thermoelectric couple fixed into the test specimen, i
28、n accordance with figure 6. Any misalignment of the specimen configuration during clamping into the tensile testing machine shall be compensated by suitable means e.g. by interposed blocks at each end of the test piece (see figure 5). The test piece shall be held between the jaws at (50 L W The dime
29、nsions L and W shall be measured, before applying the load, to within * 0,l mm. is the bond strength, in megapascals ; is the length of overlap, in millimetres ; is the width of overlap, in millimetres. 6.2 Determination of failure mode The failure pattern shall differentiate between adhesive and co
30、hesive portions. They shall be expressed as a percentage of the total area. Where a primer has been used, the plane of any adhesive failure is to be given. 7 Designation EXAMPLE EN2667- 1 I Number of this standard I 8 Test report It shall include the following : - reference to this standard ; - comp
31、lete identification of the foaming adhesive and of the primer, if any, including the type, name and address of the manufacturer, batch number, material standard number, initial thickness and expansion ratio to EN 2667-3 ; - storage conditions of adhesive before curing ; - complete identification of
32、the metal including the thickness in millimetres and its surface preparation, including storage up to the bonding ; - processing and curing conditions including the choice of bonding method (autoclave, press or furnace), pressure on the adhesive bond, heat-up rate, curing time and temperature ; - te
33、st conditions and temperature ; - type of test machine, selected capacity, and rate of load application ; - number of test specimens ; - information regarding each test specimen including reference mark, dimensions of the overlaps, panel thickness, thickness of the adhesive after curing, failure loa
34、d and bond strength ; - the type of failure, including the average break, in cohesion and/or adhesion for the adhesive and any primer as a percentage of the total overlap surface ; - the average, minimum and maximum bond strength values, as well as the standard deviation of the test series ; - any d
35、eviation from this standard in detail ; - date of teS.and signature. STD.AECMA PREN 2bb7-3-ENGL L77b 3O323Ll O032327 031 Page 7 prEN 2667-1 : 1996 Dimensions in millimetres Test specimens C F C .- E Cylindrical hole / Oblono hole 10 c- 25 i 0.2 - Figure 1 : Test panel to be machined Test soecimens I
36、 m 0 F c E - .- 10 c- 25+0.2- 1 1 - 1.5 to 2 Figure 2 : Pre-cut test panel Page 8 prEN 2667-1 : 1996 CI I I Adhesive spew m Il Dimensions in millimetres c L O a a -7 cn W Ln a m II II Figure 3 : Position of spacer I I I , 1 I 2 I I I +I In N II 1 Rolling 11 direction I min. 170 I a, = thickness of c
37、ured adhesive a = thickness of test piece 1,6 mrn for aluminium alloy 1.2 mrn for steel and titanium Figure 4 : Test specimens after curing Page 9 prEN 2667-1 : 1996 Dimensions in millimetres Block 50 5 L = 12.5 f 0,3 50 f 5 c - Block thickness : / Adhesive spew thickness : UC+U Figure 5 : Test specimens after curing with alignment blocks QI Thermoelectric couple Figure 6 : Position of thermoelectric couple Page 10 prEN 2667-1 : 1996 Dimensions in millimetres Figure 7 : Position in jaws of tensile test machine
