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1、INTERNATIONAL STANDARD INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION MEXAYHAPOAHAR OPrAHM3AqMfl Il0 CTAHAAPTM3AqMM Adhesives - Determination of tensile strength of butt joints Adhsifs - Dtermination de la rsistance en traction des joints bout SO 5922 Grs
2、t edition 1987-1 2- 15 Reference number IS0 6922 : 1987 (E) Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 21:44:55 MDTNo reproduction or networking permitted without license fr
3、om IHS -,-,- Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject
4、for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with ISO, also take part in the work. Draft International Standards adopted by the technical committees are circulated
5、to the member bodies for approval before their acceptance as International Standards by the IS0 Council. They are approved in accordance with IS0 procedures requiring at least 75 % approval by the member bodies voting. International Standard IS0 6922 was prepared by Technical Committee ISO/TC 61, Pl
6、astics. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated. O International Organization for Standardization, 1987 Printed in Switzerland 485L
7、903 005L55L 8 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 21:44:55 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD IS0 6922 :
8、 1987 (E) Adhesives - Determination of tensile strength of I I butt joints 1 This International Standard specifies a method for determining the bond strength of a butt joint when subjected to tensile force. The method can be applied to all types of adhesives. Although primarily intended for use unde
9、r ambient conditions, the basic method can also be applied to testing under a wide range of temperature and other environmental conditions. The method requires rigid adherends that can be produced to the required dimensional tolerances and that will withstand the forces applied to them during the te
10、st. Scope and field of application 2 References IS0 291, Plastics - Standard atmospheres for conditioning and testing. ISO/ 527, Plastics - Determination of tensile properties. IS0 3534, Statistics - Vocabulary and symbols. IS0 5893, Rubber and plastics test equipment - Tensile, flex- ural and compr
11、ession types (constant rate of traverse) - Description. IS0 6354, Adhesives - Vocabulary. 3 Principie A joint formed from two bar or rod adherends bonded by faces normal to their length is stressed to rupture by a tensile force, applied through the long axis of the test specimen. The reported result
12、 is the observed force at rupture. 4 Apparatus 4.1 Testing machine, so selected that the rupture of the specimen falls between 10 % and 90 % of the full-scale ca- pacity. In addition, the response time of the machine shall be short enough not to affect the accuracy with which the force applied at th
13、e time of rupture can be measured. The recorded force shall not differ from the true applied force by more than 1 %. The machine shall be capable of applying a tensile force that increases at a steady rate (see the note). It shall be pro- vided with a suitable pair of self-aligning grips to hold the
14、 specimen. The grips shall be so constructed that they will move into alignment with the test specimen as soon as the load is applied so that the long axis of the test specimen will coincide with the direction of the applied force through the centre-line of the grip assembly. NOTE - If the equipment
15、 does not allow for constant rate of load application, use a rate of jaw separation that approximates the rate of loading (see ISO/R 527). 4.2 ing. An example of a simple jig is shown in the figure. Jig, for accurately aligning the adherends during bond- 1 Copyright International Organization for St
16、andardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 21:44:55 MDTNo reproduction or networking permitted without license from IHS -,-,- - 6922-87 I4851703 0051553 I IS0 6922 : 1987 (E) r EndE Figure - Example of suitable simpl
17、e jig for butt joint assembly NOTES 1 In the jig shown, first adjust the position of end E so that any fillet of adhesive forced from the joint coincides with the groove, 2 Then adjust end A CO that, with the joint in position, the spring will exert the requir, nd pressure. 3 Then withdraw the press
18、ure pad by turning the wing nut and insert the joint. Slacken the wing nut so that the full spring pressure is applied to the joint. 5 Test specimens 5.1 Adherends 5.11 For purposes of comparison of adhesives and for inter- laboratory testing, the two adherends shall be of identical material and sha
19、ll be strong enough to prevent appreciable deformations. For other purposes, the two adherends may differ. 5.1.2 Unless otherwise specified, the dimensions of the adherends shall be as follows: - for circular sections: diameter IO, 15, 25 or 50 mm; - for square sections: length of side of square IO,
20、 15, 25 or 50 mm. The tolerance on all the above dimensions shall be I0,l mm. The length of the adherends may be 50 mm or three times the diameter (or side), whichever is the smaller. 5.1.3 The surfaces for bonding shall be plane and normal to the long axis of the prism. The opposite ends of the adh
21、erends shall be machined to fit the grips or adaptors of the test machine (4.1). 5.1.4 Before bonding, the surfaces of the adherends shall be prepared in accordance with the recommendations of the adhesive manufacturer or as specified when this method is called up. 5.2 Dimensions of joint The size o
22、f joint used depends on the following : a) the strength of the adhesive under examinatic b) the range of capabilities of the test machine; c) the nature of the adherend material; d) the nature of the environmental tests to be applied to the joint. 5.3 Bonding Apply the adhesive to the adherends and
23、perform the bonding operation under conditions recommended by the manufacturer of the adhesive or as specified when this method is called up. In the absence of such recommendations, the procedure shall be such as to obtain an optimum bond. In any case use the jig (4.2) to ensure accurate alignment o
24、f the adherends. Apply sufficient adhesive to avoid a starved joint and to provide a slight curplus around the edge of the joint. Removal of the surplus adhesive is not usually necessary, but when it is necessary do this before the adhesive has set. At the conclu- 2 Copyright International Organizat
25、ion for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 21:44:55 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 6922 : 1987 (E) sion of the setting time in the jig, allow the bonded assemb
26、ly to condition (see clause 6) for a suitable period without applied pressure. NOTE - Starved joint is defined as a “joint that has an insufficient amount of adhesives to produce a satisfactory bond“ in IS0 6354. 5.4 Number of test specimens The number of specimens to be tested shall be as specified
27、 in the adhesive specification or, if not so specified, shall be not less than five and sufficient to provide five valid test results (see 7.2). 6 Conditioning and test atmosphere Adherends shall be prepared, stored and bonded, and the test specimens conditioned and tested, under standard conditions
28、 of temperature and humidity. In the absence of specified re- quirements, the recommended conditions are 23 f 2 O C and (50 f 5) % relative humidity as described in IS0 291. 7 Procedure 7.1 Locate the test specimen symmetrically in the grips. Operate the machine so that the test joint is subjected t
29、o a force that increases at a constant (.e. steady) rate. This rate shall be such that the joint is broken in 60 f 20 s. NOTES 1 The machine should be operated under substantially constant con- ditions throughout the test, although a stress-strain diagram may indicate non-linearity at the beginning
30、and end of the test (see IS0 58931. 2 If no previous experience is available for the type of joint under test, preliminary tests should be carried out to establish suitable operating conditions. 7.2 Record the highest force during rupture as the breaking force of the test specimen. Discard results f
31、rom test specimens that show starved joints or which fail in the adherend see 7.3 c) unless the breaking force meets the minimum re- quirements of the adhesive specification. 7.3 example: Record the type of failure for each test specimen; for a) cohesion failure in the adhesive; b) adhesion failure
32、at the adhesive/adherend interfaces; c) cohesion failure in the adherend close to the adherendladhesive interface. 8 Expression of results Express the results of the tests as the arithmetic mean of the breaking force of five valid test results unless otherwise specified in the adhesive specification
33、. NOTE - It is suggested that the following criteria (see IS0 3534) for repeatability and reproducibility should normally be observed for test results obtained using this International Standard. It is emphasized that these criteria are offered for guidance only. Failure to meet one or both criteria
34、does not itself imply failure to comply with this International Standard. a) the repeatability, .e. the difference between any two mean breaking forces of groups of tests, obtained with one sample of adhesive on the same adherend system by the same operator in a given test room or laboratory, should
35、 be less than 2,5 times the standard deviation for five tests; and b) the reproducibility, .e. the difference between the mean breaking forces of groups of tests obtained with one sample of adhesive on the same adherend system in different fest rooms or laboratories, should be less than 15 % of the
36、arithmetic mean of the individual mean values. 9 Test report The test report shall include the following particulars: a) reference to this International Standard; b) identification of the adhesive tested, including type, source, manufacturers code number, batch or lot number, form, etc.; c) identifi
37、cation of the adherends, including test specimen dimensions and surface preparation; d) the method of applying the adhesive, open assembly time, details of the bonding pressure, temperature, relative humidity and time, and conditioning time of the bonded specimens before test; e) average thickness (
38、as precise as possible) of the adhesive layer after formation of the bond, or the amount of adhesive used per unit area of the joint; f) the rate of application of the force; g) the number of specimens tested and the mean breaking force, together with information about the spread of results (includi
39、ng maximum and minimum breaking forces); h) the type of failure for each test specimen. 3 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 21:44:55 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 21:44:55 MDTNo reproduction or networking permitted without license from IHS -,-,-
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