1、CEN EN*ISO*bbY 95 3404589 01139bb 729 BRITISH STANDARD Adhesives - Test methods for fatigue properties of structural adhesives in tensile shear The European Standard EN IS0 9664 : 1995 has the status of a British Standard ICs : 83.180 BS EN IS0 9664 : 1995 u- . 1 $ ;“ CEN EN*IS0*9664 95 = 3404589 02
2、23967 665 BS EN IS0 9664 : 1995 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee STi/52, Adhesives, upon which the following bodies were represented: British Adhesives and Sealants Associaion British Plastics Federation Br
3、itish Steel Industry Centre for Adhesive Technology Chemical Industries Association Contract Flooring Association Department of the Environment (Building Research Establishment) Department of hade and Industry (Nationai Physical Laboratory) European Resin Manufacturers Association Federation of the
4、Electronics Industry Institute of Materials Minisby of Defence Society of Motor Manufacturers and Mers Timber Research and Development Association University of Bristol Welding Institute This British Standard, having been prepared under the direction of the Sector Board for Materiais and Chemicals,
5、was published under the authority of the Standards Board and comes into effect on 15 November 1995 O BSI 1995 Amendments issued since publication Amd. No. Date I Te* affected The following BSI references relate to the work on this standard: Committee reference STi/52 Draft for comment 91/52488 DC IS
6、BN O 680 24496 4 CEN EN*ISO*bb4 95 3404589 Oll3968 5Tl BS EN IS0 9664 : 1995 Contents page Committees responsible Inside front cover National foreword ii Foreword 2 1 Scope 3 2 Normative references 3 3 Dennitions and symbols 4 Principle 5 APP- 6 Specimens 7 Procedure 8 Precision 9 9 Testreport 9 Ann
7、ex A (normative) Staircase method (or Dixon and Meads method) 10 B (normative) Data reclassication method 12 B.l Example of data 12 1 Fatigue stress cycle 4 Table Figures 2 Qpical SN curve of a one-component epoxy adhesive 3 Shape and dimensions of the specimen 4 Testpanels A.l Example of the stairc
8、ase method 5 8 8 11 i CEN EN*IS0*9bb4 95 3404589 OLL3969 438 BS EN IS0 9664 : 1996 National foreword This British Standard has been prepared by Technid Committee STY52 and is the English language version of EN IS0 9664 Adhesives - Test method+ for fatigue piperties of structuml adhesives in tensile
9、shear-, published by the European Committee for Standardization (CEN). EN IS0 9664 was produced as a result of intemationai discussion in which the United Kingdom participated. Compliance with a British Standard does not of itself confer immunity from legal obligations. ii CEN EN*IS0*9664 95 I 34045
10、89 OLL3970 L5T M EUROPEAN flmm NORME EUR0PEE”E EuROPmE NORM EN IS0 964 June 1995 ICs 83.180 Descriptors: Plastics, adhesives, tests, fatigue tests, determination, shear strength English version Adhesives - Test methods for fatigue properties of structural adhesives in tensile shear (IS0 9664: 1993)
11、Adhsifs - Mthodes dessai de tenue la fatigue dadhsifs stnicturaux en traction-cisaiiiement (IS0 9664 : 1993) Klebstoffe - Verfahren zur Prufung der Ermdungseigenschaften von strukturklebungen bei Zugscherbeanspruchung (IS0 9664 : 1993) This European Standard was approved by CEN on 199505-11. CEN mem
12、bers are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on applicati
13、on to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the s
14、ame status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, fiance, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardiza
15、tion Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels O 1995 AU rights of reproduction and communicatin in any form and by any means reserved in all countries to CEN and its members Ref. No. EN IS0 9664 : 1995 E CEN EN*IS0*7bb4 75
16、 340Y587 Oll397L 09b 9 Page 2 EN IS0 9664 : 1996 Foreword The text of the Intemaional Standard from ISORY: 61, Piastia, of the International qpbation for standardization (BO) has been taken over as a European Standard by the Technical Committee CENRY:193, Adhesives. This European Standard shaU be gi
17、ven the status of a national sandard, either by publication of an identical text or by endoresement, at the latest by December 1996, and confiidhg national standards shall be withdrawn at the latest by December 1996. According to the CENICENELEC internal - the fatigue zone where, for a given stress,
18、 all the specimens fail at the end of a number of cycles less than the number of conventional fault test cycles NF mentioned above. 4 Principle The specimen is cyclically stressed in a way that ma! be regarded as the superposition of an alternatir stress on a static stress which is the mean stress.
19、CEN EN*ISO*bb4 95 3404589 0333974 BT5 Page 5 EN IS0 9664 : 1995 O rb L“ 111 YI al L UI o) c c E c L al c d The number of cycles at failure of the specimen is determined for a given q, and ra. These values are used to establish SN curves which then permit the estimation of the confidence zone concern
20、ing the fa- tigue resistance of a joint. 7- 6- 5- 4- - 3- 2- 1- 10 5 Apparatus 5.1 Template, for the accurate positioning of sub strates during bonding. 5.2 Fatigue test machine, to enable sinusoidal fa- tigue stress cycles to be obtained such that the maximum stress is between 10 % and 80 % of the
21、scale range. The test frequency and the type of equipment may affect the test result. Unless indicated otherwise, the frequency shall be 30 Hz. The maxi- mum frequency shall be 60 Hz, since excessive heat- ing of the bond can occur at frequencies higher than 60 Hz. The machine shall be provided with
22、 a self- centring device for attachment of the specimen. The NF device shall be designed in such a way that its vaflous components move in perfect alignment with the specimen as soon as the specimen is subjected to stress. In this way the major axis of the specimen coincides with the direction of ap
23、plication of the force and the axis of symmetry of the device. Attachments passing through the substrate may be used, in which case the specimen shall be reinforced as indicated in figure 3 b), using additional supports. 6 Specimens 6.1 Substrate materials The specimens shall conform in shape, dimen
24、sions and alignment to those indicated in figures 3 a) or 3 b) for steel and 3 c) for aluminium. NOTE 1 Recommended substrates are aluminium 2024 A 5T3 and steel XC 18 or E 24, grade 1 or 2. Other grades may be used, depending on the end use of the adhesive. 105 To HO6. 13 MPa) = 3.2 MPa c Fatigue z
25、one Number ot cycles N 2 ai Standard stad specimens, test at 30 Hz at room temperature, semi-logarithmic coordinates CEN EN*IS0*9bb4 95 m 3404587 0333975 731 m gA i CI cn cn U L o c P z z 5 4- .Page 6 EN IS0 9664 : 1995 10- 9- a- 7- 6- 5- 4- c 3- 2- 1- 104 i r * ro (lo6, 13 MPa) = 32 HPa Number of c
26、ycles N 2 bl Standard steed rpsdmens, tart at 30 Hr at room temperature, log-log coordinates Figure 2 - Typical SN curve of a one-component epoxy adhesive 6.2 Preparation Prepare the bonded specimens individualiy or from panels which may or may not be grooved (see figure 4). In selecting the method
27、of preparation, account shall also be taken of the possible mechanical damage to the bonded specimens. Special attention shall be paid during the preparation of individual specimens to achieving a suitable alignment and good homogeneity of the joint, particularly with regard to its thickness. Surfac
28、e preparation shall be carried out in accordance with 604588, unless otherwise specified. The ad- hesive shall be used in accordance with manufac- turers instructions. In all cases the use of a template is necessary to ensure correct overlap, accurate alignment of the substrates, and regular thickne
29、ss of the bonded joint for each specimen and for collections of specimens. 6.3 Number of specimens The number of specimens depends on the precision required and the results sought. The minimum num- ber of specimens is defined as follows: - at least four specimens tested at three different values of
30、sa such that failure occurs between 104 and 10s cycles. This allows at least 12 specimens for the statistical determination of the limit of en- durance at 1Oe cycles; - at least six specimens for the determination of the static shear strength rR. CEN EN*ISO*qbb4 95 E 3404589 O113976 678 Page 7 EN IS
31、0 9664 : 1995 Dimensions in millimetres F- I I I (Y Zone held in the clamp ShMrlng zone 9,25 loo o 4 7 tom held In the clamp II I I I l2.s 20.2 , I so I I so le7.5 r 3 a) Steel substrates held In a ckmp I I 1 L 1 I I 1 I c 100 3 b) Steel rubstrates flxed across supports L 9 r 20 CEN EN*ISO*9664 95 W
32、 3404589 OLL3777 504 F IC IC JC Page 8 EN IS0 9664 : 1995 I I I cy I I l l c I l- y. Y I #I I I I I I c I ? Dimensions in rnillimetre: m NI t 1 I + Il I ! - -12.5 *0,2 Bonded 91 mln. I- -1 L_ 20 - Zones held in the clamp 2 - i70 mln. - - 3 CI Aluminium rubstrates with double overlap Figure 3 - Shape
33、 and dimensions of the specimen Dimensions in millimetres 12.5 +0.25 I I I Olscard r Typical I I I I Olscard 4 a) Typtcal teat pand for sted 4 b) Typical test panel with double overlap for alumlnium Figure 4 - Test panels CEN EN*ISO*qbb4 95 3404589 01i33778 440 6.4 Test conditions The specimens shal
34、l be stored and subjected to test under the standard atmosphere of 23 C f 2 “C and (50 f 5) % relative humidity as specified in IS0 291. 7 Procedure 7.1 General conditions Adhesives may be subject to creep, even at ambient temperature, under the effect of a non-zero mean stress T,. Ensure before the
35、 fatigue test that the mean stresses used during the test peflod do not cause a failure due to creep to be attributed to a fail- ure due to fatigue. Fix the specimens symmetrically in the clamps at the distance indicated in figure3, depending on the type of specimen tested. Bring the specimen up to
36、its mean stress T and then up to the test frequency so that the amplitude 7a is reached. 7.2 Construction of the SN curve, at a given mean stress value L, Specimens shall be tested for fatigue properties after assessing the static shear strength TR on a lot of at least six specimens of the same conf
37、iguration. 7.2.1 Select the T, value in the range 0,25 TR to 0,5 TR, where sR is the static shear strength of the adhesive, and indicate the chosen value in the test report. NOTE 2 The T, value generally used is 0,35 TR. 7.2.2 Test at least four specimens for each of the ,implitudes T, chosen such t
38、hat the failures occur be- tween lo4 and 106 cycles. A minimum of three dif- ferent amplitudes is necessary in this range. Determine the limit of endurance at 106 fault test cy- cles NF. In that part of the curve where the service life be- comes very long, the scatter, at a given level of stress, re
39、sults in failures. In such a case the results shall be indicated on the curves using a particular symbol, e.g.: X for failed specimens, and X + for specimens which have not failed the number of specimens which have not failed is shown in brackets (see e.g. figure 211. Page 9 EN IS0 9664 : 1995 In th
40、is region, the correct determination of a point on the SN curve requires the use of a statistical method. Where the specimens are tested individualiy, the staircase method is used to determine the endurance limit rD(NF, T,) (see annex A). If the fatigue machine used is equipped with a jig al- lowing
41、 the simultaneous testing of a group of speci- mens, the results are processed in accordance with the data reclassification method (see annex 6). 7.2.3 Plot the SN curve, passing through the centre-line points and the endurance limit b(lVF, .I,) with coordinates either (ia, Ig N) or (Ig T, Ig N) whi
42、ch permits a straight line to be obtained. NOTE 3 A similar method may be used to obtain the SN curve at a constant it, value (generaliy 0,l) instead of a constant T, value. 8 Precision The precision of this test method is not known be cause interlaboratory data are not available. When interlaborato
43、ry data are obtained, a precision state- ment will be added at the time of revision. 9 Test report The test report shall include the following information: reference to this International Standard; all the information necessary for identification of the adhesive tested; identification of the substra
44、tes; method of surface preparation; description of the methods of bonding and curing of the adhesive; test conditions; mean thickness per specimen of the adhesive layer, after the joint has been produced, including the accuracy of measurement; number of specimens; frequency used; static shear streng
45、th TR of the adhesive; results of T, T and T, in megapascals, N (number of cycles) and the curves obtained in accordance with the procedure described in clause 7. CEN EN*IS0*9bb4 95 B 3404589 0113979 387 Page 10 EN IS0 9664 : 1995 Annex A (normative) Staircase method (or Dixon and Moods method) A. 1
46、 Principle k is the number of levels necessary to pass from a certain failure event to a certain A maximum test duration (number of cycles) and a non-failure event (O i k). strength of the adhesive). This attempts to bracket the endurance limit T(N, tm) by a succession of failures and non-failures.
47、A.3 Calculation of the standard deviation of the limit of endurance The estimation of the standard deviation is calculated by the formula: A.2 Method An uneven number of specimens is tested. s = 1,62 x d ( B-AZ +0,029) L2 Thejth specimen is tested at the stress amplitude t . close to the assumed TD(
48、NF). If failure occurs, the ne2 specimen should be tested at L,+, = Taj-d. If there is no failure the next specimen should be tested at T+ = ty+d until all the specimens have been used. The stresses should be numbered from the lowest amplitude tfsted, which is denoted by the index i= O, .e. ta. The
49、endurance limit is given by the equation r where with i=k B = ci x 4 i=O providing that LXB-A ,0,3 L2 A.4 Typical example of staircase method Assuming that: NF= 10 t, = 10 MPa ,(10, 10) = 5,86 MPa s = 0,52 MPa 7; is the amplitude of the smallest stress used during the test; d is the space between two amplitudes; L is the number of least frequent possi- bilities (failure or non-failure) for the whole of the test sequence; i-k A=zixn, i-O For 21 specimens, an endurance limit of 5,86 MPa is obtained and a standar
