DIN EN 14869-2-2011 Structural adhesives - Determination of shear behaviour of structural bonds - Part 2 Thick adherends shear test (ISO 11003-2 2001 modified) German version EN 14.pdf

1、July 2011 Translation by DIN-Sprachendienst.English price group 11No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 8

2、3.180!$sQ“1805846www.din.deDDIN EN 14869-2Structural adhesives Determination of shear behaviour of structural bonds Part 2: Thick adherends shear test (ISO 11003-2:2001, modified)English translation of DIN EN 14869-2:2011-07Strukturklebstoffe Bestimmung des Scherverhaltens struktureller Klebungen Te

3、il 2: Scherprfung fr dicke Fgeteile (ISO 11003-2:2001, modifiziert)Englische bersetzung von DIN EN 14869-2:2011-07Adhsifs structuraux Dtermination du comportement en cisaillement dadhsifs structuraux Partie 2: Mthode dessai en traction sur prouvette paisse (ISO 11003-2:2001, modifi)Traduction anglai

4、se de DIN EN 14869-2:2011-07SupersedesDIN EN 14869-2:2004-10www.beuth.deDocument comprises pagesIn case of doubt, the German-language original shall be considered authoritative.2207.11 DIN EN 14869-2:2011-07 A comma is used as the decimal marker. National foreword This standard has been prepared by

5、Technical Committee CEN/TC 193 “Adhesives” (Secretariat: AENOR, Spain). The responsible German body involved in its preparation was the Normenausschuss Materialprfung (Materials Testing Standards Committee), Working Committee NA 062-04-55 AA Prfung von Konstruktions-klebstoffen, -klebverbindungen un

6、d Kernverbunden. Deviations from ISO 11003-2:2001 are marked by a vertical line in the left margin. Amendments This standard differs from DIN EN 14869-2:2004-10 as follows: a) an environmental statement has been included; b) normative references have been updated; c) dimensions in Figures 4 and 6 ha

7、ve been modified; d) the standard has been editorially revised. Previous editions DIN 54451: 1978-11 DIN EN 14869-2: 2004-10 2 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 14869-2 May 2011 ICS 83.180 Supersedes EN 14869-2:2004English Version Structural adhesives - Determination of shear beha

8、viour of structural bonds - Part 2: Thick adherends shear test (ISO 11003-2:2001, modified) Adhsifs structuraux - Dtermination du comportement en cisaillement dadhsifs structuraux - Partie 2 : Mthode dessai en traction sur prouvette paisse (ISO 11003-2:2001, modifi) Strukturklebstoffe - Bestimmung d

9、es Scherverhaltens struktureller Klebungen - Teil 2: Scherprfung fr dicke Fgeteile (ISO 11003-2:2001, modifiziert) This European Standard was approved by CEN on 10 March 2011. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this Eur

10、opean 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 application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versio

11、ns (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 CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, B

12、elgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN C

13、OMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14869-2:2011: EEN 14869-2:2011 (E)

14、 2 Contents Page Foreword 31 Scope 42 Normative references 43 Terms and definitions .44 Principle 45 Apparatus .66 Specimen 66.1 Specimen dimensions and configurations .66.2 Adherends 76.3 Preparation of surfaces before bonding .77 Test specimen 97.1 Preparation .97.1.1 Specimens with flat-ended adh

15、erends 97.1.2 Specimens with stepped adherends. 107.2 Number of specimens 108 Procedure 139 Calculations . 159.1 Symbols used 159.2 Average shear stress in the adhesive 159.3 Shear strain in the adhesive 159.4 Stress strain curve 179.5 Shear modulus of the adhesive . 1810 Precision 1811 Test report

16、. 18Annex A (informative) Suitable extensometer design 20DIN EN 14869-2:2011-07 EN 14869-2:2011 (E) 3 Foreword This document (EN 14869-2:2011) has been prepared by Technical Committee CEN/TC 193 “Adhesives”, the secretariat of which is held by AENOR. This European Standard shall be given the status

17、of a national standard, either by publication of an identical text or by endorsement, at the latest by November 2011, and conflicting national standards shall be withdrawn at the latest by November 2011. Attention is drawn to the possibility that some of the elements of this document may be the subj

18、ect of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 14869-2:2004. SAFETY STATEMENT Persons using this document should be familiar with the normal laboratory practice, if applicable. This document does not p

19、urport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any regulatory conditions. ENVIRONMENTAL STATEMENT It is understood that some of the material permitt

20、ed in this standard may have negative environmental impact. As technological advantages lead to acceptable alternatives for these materials, they will be eliminated from this standard to the extent possible. At the end of the test, the user of the standard should take care to carry out an appropriat

21、e disposal of the wastes, according to local regulation. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Fi

22、nland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. DIN EN 14869-2:2011-07 EN 14869-2:2011 (E) 4 1 Scope This European Standard s

23、pecifies a test method for determining the shear behaviour of an adhesive in a single lap joint bonded assembly when subjected to a tensile force. The test is performed on specimens consisting of thick, rigid adherends, with a short length of overlap, in order to obtain the most uniform distribution

24、 of shear stresses possible and to minimize other stress states which initiate failure. This test method may be used to determine: the shear-stress against shear-strain curve to failure of the adhesive; the shear modulus of the adhesive; other adhesive properties that can be derived from the stress/

25、strain curve such as the maximum shear stress and shear strain; the effect of temperature, environment, test speed, etc. on these properties. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited

26、 applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 923:2005+A1:2008, Adhesives Terms and definitions EN 13887, Structural Adhesives Guidelines for surface preparation of metals and plastics prior to adhesive bonding EN ISO 291, Plas

27、tics Standard atmospheres for conditioning and testing (ISO 291:2008) EN ISO 10365, Adhesives Designation of main failure patterns (ISO 10365:1992) ISO 683-11, Heat-treatable steels, alloy steels and free-cutting steels Part 11: Wrought case-hardening steels ISO 1052, Steels for general engineering

28、purposes ISO 4995, Hot-rolled steel sheet of structural quality 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 923:2005+A1:2008 apply. 4 Principle An adhesively bonded test specimen (see Figure 1) is subjected to a tensile force so that the adhesive

29、is stressed in shear. DIN EN 14869-2:2011-07 EN 14869-2:2011 (E) 5 The relative displacement of the adherends is measured using a purpose-built transducer located in the central region of the specimen. Force and displacement are measured from the start of application of the load until fracture of th

30、e specimen. The shear stresses and strains are then calculated from the bond dimensions. Dimensions in millimetres Key a) Bonded adherends b) Machined adherends 1 Adhesive bond b Width of adhesive l Length of adhesive Figure 1 Specimen dimensions and configuration DIN EN 14869-2:2011-07 EN 14869-2:2

31、011 (E) 6 5 Apparatus 5.1 Tensile-testing machine, capable of producing fracture in the specimen at a tensile force between 10 % and 80 % of the full-scale range of the force transducer. 5.2 Device for introducing a force into the specimen, so that negligible torque develops when force (F) is applie

32、d to the specimen. For this purpose, the simple universal-joint design shown in Figure 2 is satisfactory. 5.3 Force transducer, capable of measuring the force in the specimen with an accuracy of 1 % of the force at a shear strain of 0,01. 5.4 One or two extensometers (see Note 2), for measuring the

33、shear displacement between points of known separation on each adherend in the central region of the bond (see Figure 3 and Annex A). The points of contact with the adherends shall be within a distance of 2 mm from the bonded faces. The device(s) shall be capable of measuring the shear displacement t

34、o an accuracy of 1 m. NOTE 1 During loading, each adherend will bend slightly, leading to a small rotation of the central (bonded) region of the test specimen. In order to achieve high accuracy in displacement measurements, the extensometer(s) should rotate with the specimen. This has been achieved

35、in the design shown in Figure 3 by double-pin contact with one of the adherends. NOTE 2 The use of two extensometers on opposing faces of the specimen is recommended to minimize, by averaging the extensometer readings, any contribution to measurements from a twisting moment applied to the specimen.

36、The use of two extensometers will also serve to indicate any malfunctioning of one of the extensometers as revealed by significantly different readings from the two devices. 5.5 Data-logging equipment, to continuously record the relative displacement of the adherends and the applied load, from the s

37、tart of application of the load until the specimen breaks. 5.6 Micrometer, having an accuracy of better than 0,002 mm, to measure the dimensions of the adherends. 5.7 Optical microscope, having an accuracy of better than 0,002 mm, to measure the thickness of the adhesive bond when the specimen confi

38、guration shown in Figure 1a) is used. 6 Specimen 6.1 Specimen dimensions and configurations Specimens shall be prepared either by bonding metal plates or strips together to produce the configuration shown in Figure 1a) or by bonding adherends that have been machined to the shape shown in Figure 1b).

39、 The dimensions of the specimen are given in Figure 1 and are the same, within variations in the bond thickness, for both preparation methods. The bond thickness shall not be less than 0,05 mm. NOTE The adherends shown in Figure 1a) have a lower bending stiffness than the continuous geometry shown i

40、n Figure 1b). Consequently, the peel stresses at the ends of the adhesive in the specimen in Figure 1a) will be higher than those in the specimen in Figure 1b). However, these differences in stiffness are likely to cause a trivial deviation in the comparative results. DIN EN 14869-2:2011-07 EN 14869

41、-2:2011 (E) 7 Figure 2 Example of device for loading the specimen in a tensile-testing machine 6.2 Adherends For the purpose of the measurement of the properties of the adhesive, steel adherends are recommended because of their high modulus. Machine the panels or bars to be used for the adherends in

42、 accordance with ISO 683-11, ISO 1052 and ISO 4995 to the dimensions given in Figure 1a) or 1b) depending on which specimen configuration is chosen. 6.3 Preparation of surfaces before bonding The surfaces to be bonded shall be prepared in accordance with EN 13887 or by any other method leading to co

43、hesive failure within the adhesive layer. DIN EN 14869-2:2011-07 EN 14869-2:2011 (E) 8 Key 1 Mobile inner part 2 Rigid outer frame 3 Steel leaf spring 4 Transducer coil 5 Transducer core 6 Turgsten pins Figure 3 Example of extensometer positioning DIN EN 14869-2:2011-07 EN 14869-2:2011 (E) 9 7 Test

44、specimen 7.1 Preparation 7.1.1 Specimens with flat-ended adherends 7.1.1.1 General Specimens with flat-ended adherends shall have the configuration shown in Figure 1a) and may be prepared from uncut panels, from pre-cut panels or as individual specimens from machined plates. 7.1.1.2 Uncut panels The

45、 panels from which the specimens are cut shall consist of two sheets with dimensions in accordance with Figure 4, bonded together in accordance with the adhesive manufacturers instructions. In order to define the thickness of the adhesive, shims or spacers (metal foil) or calibrated metal wires may

46、be incorporated outside the area which will become the overlap zone. Cut the bonded panels into specimens using a suitable tool such as a band saw. Then subject the specimens to the required machining. Perform the last pass on the edge of the specimen parallel to the longitudinal direction of the sp

47、ecimen so as to avoid any metal burrs along the bonded joint. Drill holes at the ends of each specimen for pins to hold the specimen to the tensile-testing machine. Delineate the overlap zone by milling two grooves as shown in Figure 5. When the specimens are machined, care shall be taken to ensure

48、that the assembly is not heated above 50 C. No liquid shall be used for cooling. 7.1.1.3 Pre-cut panels Proceed as in 7.1.1.2, using two pre-cut sheets so as to obtain a panel in accordance with Figure 6. Two holes shall be provided in each sheet so that the two sheets can be superposed correctly us

49、ing an assembly with two centring lugs. Cut out and machine specimens as explained in 7.1.1.2. 7.1.1.4 Individual specimens Bond two plates of dimensions 110 mm 25 mm 6 mm in accordance with the adhesive manufacturers instructions, defining the thickness of the adhesive joint as indicated in 7.1.1.2. Ensure that the sides of the adherends are parallel to the nearest 0,1 mm. Machine each specimen to the required size. Drill holes for applying the load. Make tw