BS EN 1966-2009 Structural adhesives - Characterization of a surface by measuring adhesion by means of the three point bending method《机构粘合剂 用三点弯曲法测量粘附性的方法进行表面特性的表征》.pdf

1、BS EN 1966:2009ICS 83.180NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDStructural adhesives Characterization of asurface by measuringadhesion by meansof the three pointbending methodThis British Standardwas published under theauthority of the StandardsPolicy a

2、nd StrategyCommittee on 31 March2009 BSI 2009ISBN 978 0 580 62630 2Amendments/corrigenda issued since publicationDate CommentsBS EN 1966:2009National forewordThis British Standard is the UK implementation of EN 1966:2009. Itsupersedes BS EN 1966:2002 which is withdrawn.The UK participation in its pr

3、eparation was entrusted to TechnicalCommittee PRI/52, Adhesives.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.C

4、ompliance with a British Standard cannot confer immunityfrom legal obligations.BS EN 1966:2009EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 1966February 2009ICS 83.180 Supersedes EN 1966:2002 English VersionStructural adhesives - Characterization of a surface bymeasuring adhesion by means of the

5、 three point bendingmethodAdhsifs structuraux - Caractrisation dune surface parmesure de ladhrence au moyen de la mthode de laflexion en trois pointsStrukturklebstoffe - Charakterisierung einer Oberflchedurch Messung der Adhsion nach dem Dreipunkt-BiegeverfahrenThis European Standard was approved by

6、 CEN on 27 December 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandar

7、ds may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to th

8、e CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherla

9、nds, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2009 CEN All rights of exploitation in any

10、 form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1966:2009: EBS EN 1966:2009EN 1966:2009 (E) 2 Contents Page Foreword 3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Principle 5 5 Apparatus .6 5.1 Test piece preparation apparatus 6 5.1.1 Device for moul

11、ding the adhesive .6 5.1.2 Accessories 9 5.2 Shapes and dimensions . 10 5.3 Substrate materials. 10 5.4 Test apparatus and measuring apparatus . 11 5.4.1 Bending machine 11 5.4.2 Test piece positioning device 11 5.4.3 Measuring apparatus 11 6 Preparation of substrate surfaces before bonding . 12 7 P

12、reparation of test pieces 12 7.1 General . 12 7.2 Inserting substrates . 13 7.3 Inserting adhesive 13 7.4 Hardening 13 7.5 Opening the mould . 13 7.6 Conditioning the test pieces 13 8 Test methods . 13 9 Expression of results . 13 10 Test report . 15 BS EN 1966:2009EN 1966:2009 (E) 3 Foreword This d

13、ocument (EN 1966:2009) 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 of a national standard, either by publication of an identical text or by endorsement, at the latest by August 2009, and

14、conflicting national standards shall be withdrawn at the latest by August 2009. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This d

15、ocument supersedes EN 1966:2002. SAFETY STATEMENT Persons using this document should be familiar with the normal laboratory practice, if applicable. This document does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establis

16、h appropriate safety and health practices and to ensure compliance with any regulatory conditions. ENVIRONMENTAL STATEMENT It is understood that some of the material permitted in this standard may have negative environmental impact. As technological advantages lead to acceptable alternatives for the

17、se materials, they will be eliminated from this standard to the extent possible. At the end of the test, the user of the standard shall take care to carry out an appropriate disposal of the wastes, according to local regulation. According to the CEN/CENELEC Internal Regulations, the national standar

18、ds organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Port

19、ugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 1966:2009EN 1966:2009 (E) 4 1 Scope This European Standard describes a test method to determine ability of a cured adhesive (possibly with a primer) to adhere to a substrate which has had a certain surface fi

20、nish or with a specific surface preparation by using the “three point bending method“. It is only used for quality assurance and the substrate should be rigid or resistant enough to bending such as steel or aluminium alloys. For other substrates the thickness should be adjusted to the modulus of ela

21、sticity or a suitable stiffener should be used. The adhesive should be polymerisable (curable) without pressure in order to obtain the thickness needed to provide sufficient rigidity, otherwise, a bonded reinforcing piece of the same type and same thickness as the substrate can be substituted for th

22、e bloc of adhesive. It is not suitable for film adhesives. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (in

23、cluding any amendments) applies. EN 923:2005, Adhesives Terms and definitions EN 10025-2, Hot rolled products of structural steels - Part 2: Technical delivery conditions for non-alloy structural steels EN 13887, Structural adhesives Guidelines for surface preparation of metals and plastics prior to

24、 adhesive bonding EN ISO 291, Plastics Standard atmospheres for conditioning and testing (ISO 291:2005) EN ISO 9142, Adhesives Guide to the selection of standard laboratory ageing conditions for testing bonded joints (ISO 9142:2003) EN ISO 10365, Adhesives Designation of main failure patterns (ISO 1

25、0365:1992) ISO 286-1, ISO system of limits and fits Part 1: Bases of tolerances, deviations and fits 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 923:2005 and the following apply. 3.1 interfacial zone zone where the physical, chemical and mechanica

26、l properties are different from those of substrate, the adhesive or any coating applied before bonding BS EN 1966:2009EN 1966:2009 (E) 5 Figure 1 Schematic diagram of interfacial region 4 Principle A test piece consisting of two materials, the substrate and the adhesive, shall be subjected to bendin

27、g. The test pieces used shall have only a single substrate/polymer interfacial region. The adhesive shall be moulded in the centre of the substrate in the form of a parallelepiped block which, when subjected to bending, generates a discontinuity in rigidity (see Figure 2). This leads to the initiati

28、on of a fracture in the interfacial region, at the edge of the block adhesive, chiefly as a result of the adhesive pull strength perpendicular to the plane of bonding. Key a) test piece before stress b) failure in the interfacial zone during the test c) no failure owing to rigidity or to inadequate

29、strength of the support d) no failure owing to inadequate rigidity of the adhesive Figure 2 Principle of test BS EN 1966:2009EN 1966:2009 (E) 6 The values for maximum force and displacement or for the clear space (see Figure 9) subtended at the initiation of fracture shall characterise adhesion. As

30、a general rule, the adhesive shall be sufficiently rigid for adhesion to be measured at the level of the interfacial zone. 5 Apparatus 5.1 Test piece preparation apparatus 5.1.1 Device for moulding the adhesive This consists of three elements: in the lower part, an aluminium alloy plate (Figure 3) i

31、n which substrate seatings are positioned at regular intervals .BS EN 1966:2009EN 1966:2009 (E) 7 Dimensions in millimetres General tolerance (tolerance 7 in accordance with ISO 286-1) Key 1 20 holes 3,2 Figure 3 Lower plate in the centre, a silicone rubber mould consisting of cells, with dimensions

32、 equal to those of the blocks of adhesive facing the substrate positions, and obtained from a reciprocal form (Figure 4). BS EN 1966:2009EN 1966:2009 (E) 8 Dimensions in millimetres General tolerance (tolerance 7 in accordance with ISO 286-1) Key 1 20 holes 3,2 Figure 4 Mould for silicone rubber pla

33、te in the upper part, an aluminium alloy securing plate (Figure 5) with cutouts facing the cells to allow to be filled. BS EN 1966:2009EN 1966:2009 (E) 9 Dimensions in millimetres General tolerance (tolerance 7 in accordance with ISO 286-1) Key 1 20 holes 3,2 Figure 5 Securing plate The whole assemb

34、ly shall be held together by screwing the lower plate to the securing plate with 20 screws M3x 30, which also ensure that the silicone rubber mould fits tightly to the substrates. 5.1.2 Accessories A syringe graduated in 1/100 ths of a cubic centimetre, or some other suitable device, shall be used t

35、o place a constant amount of adhesive in each cell. BS EN 1966:2009EN 1966:2009 (E) 10 5.2 Shapes and dimensions The test pieces shall consist of substrate with dimensions (50 0,1) mm x (10 0,1) mm x (e 0,02) mm, die-stamped in one piece or cut by some other means affording adequate precision or sur

36、face evenness, onto the centres of which the blocks of adhesive with dimensions (25 0,05) mm x (5 0,05) mm x (4 0,1) mm shall be moulded (see Figure 6). NOTE The thickness depends on the type of adhesive used and its shrinkage, viscosity, etc. Dimensions in millimetres Key 1 Adhesive 2 Substrate Fig

37、ure 6 Test piece 5.3 Substrate materials Sheets 1 mm thick made of steel type XC 18 or E 24, quality 1 or 2 in accordance with standard EN 10025-2, or of 1,5 mm aluminium alloy 2024 (AU 4 G 1 A 5 T 3). Other materials may be used, providing their thickness is adjusted as a function of their modulus

38、of elasticity or they are bonded to a suitable stiffener before testing. BS EN 1966:2009EN 1966:2009 (E) 11 5.4 Test apparatus and measuring apparatus 5.4.1 Bending machine Bending machine able to fracture the test piece at between 10% and 80% of the length of the scale of the force meter. The displ

39、acement rate of the moving head shall be (0,500 0,001) mm/min. 5.4.2 Test piece positioning device Test piece positioning device such that the metal substrate is centred and perpendicular in relation to the axis of displacement of the rod. The two support points consist of 6 mm diameter pins 33 mm a

40、part (see Figure 7). The central rod has a diameter of 12 mm. The length of the support points and the central rod shall be over 15 mm. Dimensions in millimetres Key 1 Rod length 15 mm 2 Support length 15 mm Figure 7 Test piece positioning device 5.4.3 Measuring apparatus The apparatus shall be capa

41、ble of measuring the test pieces reaction to deformation with a tolerance of 1% (class A gauge) and to displacement with an accuracy of 0,001 mm. BS EN 1966:2009EN 1966:2009 (E) 12 6 Preparation of substrate surfaces before bonding The surface of substrate and which adhesion is to be measured shall

42、be treated in accordance with EN 13887 or with a method in the traceability document. 7 Preparation of test pieces 7.1 General The operations described in paragraphs 7.2 and 7.3 (Figure 8) shall be performed under normal conditions: (23 2) C and (50 5) % relative humidity. Key 1 Securing (20 screws)

43、 2 Securing plate 3 Adhesive 4 Substrate 5 Plate 6 Mould (rubber resin) Figure 8 Test piece preparation device BS EN 1966:2009EN 1966:2009 (E) 13 7.2 Inserting substrates Following surface preparation, the substrates shall be placed in the seatings provided for this purpose on the lower plate of the

44、 mould with the treated side facing upwards. The silicone rubber mould shall be placed on top of this assembly, followed by the securing plate which shall be screwed down tight. Make sure that the cells do not suffer deformation. 7.3 Inserting adhesive Using the syringe, or another suitable device,

45、0,5 cm3of adhesive shall be placed in each cell, care being taken to ensure complete contact with the substrate and the walls of the mould and no to include any air bubbles. 7.4 Hardening Proceed with hardening in accordance with the instructions provided by the adhesive supplier. 7.5 Opening the mo

46、uld Remove the screws from the lower plate and the securing place, then extract the test pieces from the silicone rubber mould, gently pressing the block of adhesive down so as not to damage the interfacial region. 7.6 Conditioning the test pieces The test pieces shall be stored for a minimum of 24

47、h before the test under the conditions specified in EN ISO 291, i.e. (23 2) C and (50 5)% relative humidity. The test shall be performed under the same conditions. 8 Test methods Verify the dimensions of the test pieces. Place a test piece on the support points, place the central rod carefully on th

48、e test piece, then push it down at a rate of (0,500 0,001) mm/min. Plot the force/deformation curve up to and beyond fracture. At least six bonded test pieces shall be tested. Before each serie, an unbonded test piece (substrate only) which has been subjected to the same surface treatment shall also

49、 undergo the bending test. 9 Expression of results From the force/deformation curve recorded (Figure 9), extract and note the following information: 1) the slope (P/d) of the curve in the linear region corresponding to the first part of the recording, or in the absence of a linear zone, the maximum value of the derivative of the curve. This value corresponds to the compliance of the test pieces; 2) the maximum values for force (P max) and displacement (d max), in general at the moment of initiation of f