1、BRITISH STANDARDBS EN ISO 9664:1995Adhesives Test methods for fatigue properties of structural adhesives in tensile shearThe European Standard EN ISO 9664:1995 has the status of a British StandardICS: 83.180BS EN ISO 9664:1995This British Standard, having been prepared under the direction of the Sec
2、tor Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 November 1995 BSI 12-1999The following BSI references relate to the work on this standard:Committee reference STI/52Draft for comment 91/52488 DCISBN 0 580 24495 4Committees re
3、sponsible for this British StandardThe preparation of this British Standard was entrusted to Technical Committee STI/52, Adhesives, upon which the following bodies were represented:British Adhesives and Sealants AssociationBritish Plastics FederationBritish Steel IndustryCentre for Adhesive Technolo
4、gyChemical Industries AssociationContract Flooring AssociationDepartment of the Environment (Building Research Establishment)Department of Trade and Industry (National Physical Laboratory)European Resin Manufacturers AssociationFederation of the Electronics IndustryInstitute of MaterialsMinistry of
5、DefenceSociety of Motor Manufacturers and TradersTimber Research and Development AssociationUniversity of BristolWelding InstituteAmendments issued since publicationAmd. No. Date CommentsBS EN ISO 9664:1995 BSI 12-1999 iContentsPageCommittees responsible Inside front coverNational foreword iiForewor
6、d 21 Scope 32 Normative references 33 Definitions and symbols 34 Principle 55 Apparatus 56 Specimens 57 Procedure 108 Precision 109 Test report 10Annex A (normative) Staircase method (or Dixon and Meads method) 11Annex B (normative) Data reclassification method 12Figure 1 Fatigue stress cycle 4Figur
7、e 2 Typical SN curve of a one-component epoxy adhesive 7Figure 3 Shape and dimensions of the specimen 8Figure 4 Test panels 9Figure A.1 Example of the staircase method 12Table B.1 Example of data 13BS EN ISO 9664:1995ii BSI 12-1999National forewordThis British Standard has been prepared by Technical
8、 Committee STI/52 and is the English language version of EN ISO 9664 Adhesives Test methods for fatigue properties of structural adhesives in tensile shear, published by the European Committee for Standardization (CEN). EN ISO 9664 was produced as a result of international discussion in which the Un
9、ited Kingdom participated.A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application.Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesT
10、his document comprises a front cover, an inside front cover, pages i and ii, the EN ISO title page, pages 2 to 13 and a back cover.This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUR
11、OPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 9664June 1995ICS 83.180Descriptors: Plastics, adhesives, tests, fatigue tests, determination, shear strengthEnglish versionAdhesives Test methods for fatigue properties of structural adhesives in tensile shear(ISO 9664:1993)Adhsifs Mthodes dessai de
12、 tenue la fatigue dadhsifs structuraux en traction-cisaillement (ISO 9664:1993)Klebstoffe Verfahren zur Prfung der Ermdungseigenschaften von strukturklebungen bei Zugscherbeanspruchung (ISO 9664:1993)This European Standard was approved by CEN on 1995-05-11. CEN membersare bound to comply with the CE
13、N/CENELEC Internal Regulations whichstipulate the conditions for giving this European Standard the status of anational standard without any alteration.Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any
14、CEN member.This European Standard exists in three official versions (English, French,German). A version in any other language made by translation under theresponsibility of a CEN member into its own language and notified to theCentral Secretariat has the same status as the official versions.CEN memb
15、ers are the national standards bodies of Austria, Belgium,Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy,Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland andUnited Kingdom.CENEuropean Committee for StandardizationComit Europen de NormalisationEuropisches Komi
16、tee fr NormungCentral Secretariat: rue de Stassart 36, B-1050 Brussels 1995 All rights of reproduction and communication in any form and by any means reserved in all countries to CEN and its membersRef. No. EN ISO 9664:1995 EEN ISO 9664:1995 BSI 12-19992ForewordThe text of the International Standard
17、 from ISO/TC 61, Plastics, of the International Organization for Standardization (ISO) has been taken over as a European Standard by the Technical Committee CEN/TC1 93, Adhesives.This European Standard shall be given the status of a national standard, either by publication of an identical text or by
18、 endorsement, at the latest by December 1995, and conflicting national standards shall be withdrawn at the latest by December 1995.According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Ger
19、many, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, and the United Kingdom.EN ISO 9664:1995 BSI 12-1999 31 ScopeThis International Standard specifies a method for estimating the fatigue strength of adhesives in shear by tension loading, using
20、 standardized specimens under specified conditions, with the aim of characterizing structural adhesives on a given metallic substrate.The fatigue properties are a function of the specimen geometry. The results do not correspond to intrinsic properties of the adhesive and cannot be used for design pu
21、rposes.2 Normative referencesThe following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based o
22、n this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards.ISO 291:1977, Plastics Standard atmospheres for conditioning and tes
23、ting. ISO 4587:1979, Adhesives Determination of tensile lap-shear strength of high strength adhesive bonds. ISO 4588:1989, Adhesives Preparation of metal surfaces for adhesive bonding. 3 Definitions and symbolsFor the purposes of this International Standard, the following definitions and symbols app
24、ly.3.1 shear stress ()stress determined by dividing the force by the bonded surface areait is expressed in megapascals (MPa)3.2 static shear strength (R)average static shear stress at rupture as determined by ISO 4587it is expressed in megapascals (MPa)3.3 stress cycleSmallest part of the stress/tim
25、e function which is repeated at regular intervals.It is of sinusoidal form (see Figure 1) with undulating shear.Cyclic stress may be considered to be the superposition of an alternating stress on a static stress which is the mean stress.3.3.1 maximum stress (max)greatest algebraic value reached at r
26、egular intervals by the stressit is expressed in megapascals (MPa)3.3.2 minimum stress (min)smallest algebraic value reached at regular intervals by the stressthis stress shall always be positive and is expressed in megapascals (MPa)3.3.3 mean stress (m)algebraic mean of the maximum and minimum stre
27、ssesit is expressed in megapascals (MPa)EN ISO 9664:19954 BSI 12-19993.3.4 stress amplitude (a)alternating stress equal to half the algebraic difference between the maximum and minimum stressesit is expressed in megapascals (MPa)3.3.5 stress ratio (R)algebraic ratio of the minimum stress to the maxi
28、mum stress in one cycle3.4 fatigue limit (D)limiting value which the stress amplitude aapproaches when the number of cycles becomes very large, for a given mean stress mor stress ratio Rfor some materials, stress amplitude versus the number of cycles does not reach a limiting value but decreases con
29、stantly on increasing the number of cycles. In this case it is useful to determine a limit of endurance3.5 limit of endurance D(NF)shear stress determined at a specific number of fault test cycles NFit is expressed in megapascals (MPa)depending on whether the tests are carried out at constant mor at
30、 constant R, the results should be presented in the form:D(NF, m) in megapascals (MPa)orD(NF, R) in megapascals (MPa)3.6 service life (N)number of stress cycles applied to a specimen until it has reached the chosen end of the test. Where it has not failed, the service life is not defined but is term
31、ed greater than the test duration3.7 cycle ratio (n/N)ratio of the number of applied cycles (n) to the service life (N). This ratio is used in tests with load bearings, together with an SN curve (Woehlers curve)Figure 1 Fatigue stress cycleEN ISO 9664:1995 BSI 12-1999 53.8 SN curvecurve, allowing th
32、e resistance of the material to be seen, which indicates the relationship observed experimentally between service life N, shown conventionally in abscissae (logarithmic scale) and stress aor maxshown in ordinates in linear scale typical curve in Figure 2 a) or in logarithmic scale typical curve in F
33、igure 2 b). This curve is established by keeping either mor R, constant. The SN curve is defined by the relationship between amplitude of stress and service life. On this curve Figure 2 a) we can distinguish: the endurance zone where, for a given stress, failures as well as non-failures for a number
34、 of fault test cycles NFcan be identified; the fatigue zone where, for a given stress, all the specimens fail at the end of a number of cycles less than the number of conventional fault test cycles NFmentioned above.4 PrincipleThe specimen is cyclically stressed in a way that may be regarded as the
35、superposition of an alternating stress on a static stress which is the mean stress.The number of cycles at failure of the specimen is determined for a given mand a. These values are used to establish SN curves which then permit the estimation of the confidence zone concerning the fatigue resistance
36、of a joint.5 Apparatus5.1 Template, for the accurate positioning of substrates during bonding.5.2 Fatigue test machine, to enable sinusoidal fatigue stress cycles to be obtained such that the maximum stress is between 10 % and 80 % of the scale range. The test frequency and the type of equipment may
37、 affect the test result. Unless indicated otherwise, the frequency shall be 30 Hz. The maximum frequency shall be 60 Hz, since excessive heating of the bond can occur at frequencies higher than 60 Hz. The machine shall be provided with a self-centring device for attachment of the specimen. The devic
38、e shall be designed in such a way that its various 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 application of the force and the axis of symmetry of the device.Attachm
39、ents 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 Specimens6.1 Substrate materialsThe specimens shall conform in shape, dimensions and alignment to those indicated in Figure 3 a) or Figure 3 b) for
40、steel and Figure 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.6.2 PreparationPrepare the bonded specimens individually or from panels which may or may not be grooved
41、 (see Figure 4).In selecting the method 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, particula
42、rly with regard to its thickness.Surface preparation shall be carried out in accordance with ISO 4588, unless otherwise specified. The adhesive shall be used in accordance with manufacturers instructions. In all cases the use of a template is necessary to ensure correct overlap, accurate alignment o
43、f the substrates, and regular thickness of the bonded joint for each specimen and for collections of specimens.6.3 Number of specimensThe number of specimens depends on the precision required and the results sought. The minimum number of specimens is defined as follows: at least four specimens teste
44、d at three different values of asuch that failure occurs between 104and 106cycles. This allows at least 12 specimens for the statistical determination of the limit of endurance at 106cycles; at least six specimens for the determination of the static shear strength R.EN ISO 9664:19956 BSI 12-19992 a)
45、 Standard steel specimens, test at 30 Hz at room temperature, semi-logarithmic coordinatesFigure 2 Typical SN curve of a one-component epoxy adhesive (continued)EN ISO 9664:1995 BSI 12-1999 72 b) Standard steel specimens, test at 30 Hz at room temperature, log-log coordinatesFigure 2 Typical SN curv
46、e of a one-component epoxy adhesive (concluded)EN ISO 9664:19958 BSI 12-19993 a) Steel substrates held in a clamp3 b) Steel substrates fixed across supportsFigure 3 Shape and dimensions of the specimen (continued)EN ISO 9664:1995 BSI 12-1999 93 c) Aluminium substrates with double overlapFigure 3 Sha
47、pe and dimensions of the specimen (concluded)4 a) Typical test panel for steel 4 b) Typical test panel with double overlap for aluminiumFigure 4 Test panelsEN ISO 9664:199510 BSI 12-19996.4 Test conditionsThe specimens shall be stored and subjected to test under the standard atmosphere of 23 C 2 C a
48、nd (50 5) % relative humidity as specified in ISO 291.7 Procedure7.1 General conditionsAdhesives may be subject to creep, even at ambient temperature, under the effect of a non-zero mean stress m. Ensure before the fatigue test that the mean stresses used during the test period do not cause a failur
49、e due to creep to be attributed to a failure due to fatigue.Fix the specimens symmetrically in the clamps at the distance indicated in Figure 3, depending on the type of specimen tested.Bring the specimen up to its mean stress mand then up to the test frequency so that the amplitude ais reached.7.2 Construction of the SN curve, at a given mean stress value mSpecimens shall be tested for fatigue properties after assessing the static shear strength Ron a lot of at least six s
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