1、July 2009DEUTSCHE NORM English price group 10No part of this standard 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 83.180!$XO+“1534408www.di
2、n.deDDIN EN 1966Structural adhesives Characterization of a surface by measuring adhesion by means of thethree point bending methodEnglish version of DIN EN 1966:2009-07Strukturklebstoffe Charakterisierung einer Oberflche durch Messung der Adhsion nach demDreipunkt-BiegeverfahrenEnglische Fassung DIN
3、 EN 1966:2009-07SupersedesDIN EN 1966:2003-02www.beuth.deDocument comprises 17 pagesDIN EN 1966:2009-07 2 National foreword This standard has been prepared by Technical Committee CEN/TC 193 “Adhesives” (Secretariat: AENOR, Spain). The responsible German body involved in its preparation was the Norme
4、nausschuss Materialprfung (Materials Testing Standards Committee), Technical Committee NA 062-04-55 AA Prfung von Konstruktions-klebstoffen, -klebverbindungen und Kernverbunden. The DIN Standard corresponding to the International Standard referred to in clause 2 of this document is as follows: ISO 2
5、86-1 DIN ISO 286-1 This standard makes reference to documents which were valid as of the publication of the European standard. Since then, the standards EN 923:2005 and EN ISO 291:2006 have been withdrawn. Instead, it is recommended to make reference to DIN EN 923:2008-06, Adhesives Terms and defini
6、tions, and DIN EN ISO 291:2008-08, Plastics Standard atmospheres for conditioning and testing (ISO 291:2008). Amendments This standard differs from DIN EN 1966:2003-02 as follows: a) Normative references have been updated. b) The standard has been editorially revised. Previous editions DIN V ENV 196
7、6: 1995-09 DIN EN 1966: 2003-02 National Annex NA (informative) Bibliography 1 DIN ISO 286-1:1990-11, ISO system of limits and fits Bases of tolerances, deviations and fits EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 1966February 2009ICS 83.180 Supersedes EN 1966:2002 English VersionStructural
8、 adhesives - Characterization of a surface bymeasuring adhesion by means of the 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
9、Adhsion nach dem Dreipunkt-BiegeverfahrenThis European Standard was approved by 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.
10、Up-to-date lists and bibliographical references concerning such nationalstandards 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 translationun
11、der the responsibility of a CEN member into its own language and notified to the 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, H
12、ungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre:
13、 rue de Stassart, 36 B-1050 Brussels 2009 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1966:2009: EEN 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
14、 .6 5.1 Test piece preparation apparatus 6 5.1.1 Device for moulding 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 apparatu
15、s 11 6 Preparation of substrate surfaces before bonding . 12 7 Preparation 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 Te
16、st report . 15 DIN EN 1966:2009-07 EN 1966:2009 (E) 3 Foreword This document (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
17、 identical text or by endorsement, at the latest by August 2009, and 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 h
18、eld responsible for identifying any or all such patent rights. This document 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, asso
19、ciated 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 permitted in this standard may have negative environmental impact
20、. 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 shall take care to carry out an appropriate disposal of the wastes, according to local regulation. Ac
21、cording to the CEN/CENELEC Internal Regulations, the national standards 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, La
22、tvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. DIN EN 1966:2009-07 EN 1966:2009 (E) 4 1 Scope This European Standard describes a test method to determine ability of a cured adhesive (possibly
23、with a primer) to adhere to a substrate which has had a certain surface finish 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. F
24、or other substrates the thickness should be adjusted to the modulus of elasticity 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 t
25、he same type and same thickness as the substrate can be substituted for the 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.
26、 For undated references, the latest edition of the referenced document (including 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 ad
27、hesives Guidelines for surface preparation of metals and plastics prior to 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
28、:2003) EN ISO 10365, Adhesives Designation of main failure patterns (ISO 10365:1992) 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 a
29、pply. 3.1 interfacial zone zone where the physical, chemical and mechanical properties are different from those of substrate, the adhesive or any coating applied before bonding DIN EN 1966:2009-07 EN 1966:2009 (E) 5 Figure 1 Schematic diagram of interfacial region 4 Principle A test piece consisting
30、 of two materials, the substrate and the adhesive, shall be subjected to bending. 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, g
31、enerates a discontinuity in rigidity (see Figure 2). This leads to the initiation 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 int
32、erfacial zone during the test c) no failure owing to rigidity or to inadequate strength of the support d) no failure owing to inadequate rigidity of the adhesive Figure 2 Principle of test DIN EN 1966:2009-07 EN 1966:2009 (E) 6 The values for maximum force and displacement or for the clear space (se
33、e Figure 9) subtended at the initiation of fracture shall characterise adhesion. As 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
34、consists of three elements: in the lower part, an aluminium alloy plate (Figure 3) in which substrate seatings are positioned at regular intervals .DIN EN 1966:2009-07 EN 1966:2009 (E) 7 Dimensions in millimetres General tolerance (tolerance 7 in accordance with ISO 286-1) Key 1 20 holes 3,2 Figure
35、3 Lower plate in the centre, a silicone rubber mould consisting of cells, with dimensions equal to those of the blocks of adhesive facing the substrate positions, and obtained from a reciprocal form (Figure 4). DIN EN 1966:2009-07 EN 1966:2009 (E) 8 Dimensions in millimetres General tolerance (toler
36、ance 7 in accordance with ISO 286-1) Key 1 20 holes 3,2 Figure 4 Mould for silicone rubber plate in the upper part, an aluminium alloy securing plate (Figure 5) with cutouts facing the cells to allow to be filled. DIN EN 1966:2009-07 EN 1966:2009 (E) 9 Dimensions in millimetres General tolerance (to
37、lerance 7 in accordance with ISO 286-1) Key 1 20 holes 3,2 Figure 5 Securing plate The whole assembly 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 s
38、yringe graduated in 1/100 ths of a cubic centimetre, or some other suitable device, shall be used to place a constant amount of adhesive in each cell. DIN EN 1966:2009-07 EN 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) m
39、m x (e 0,02) mm, die-stamped in one piece or cut by some other means affording adequate precision or surface 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 a
40、dhesive used and its shrinkage, viscosity, etc. Dimensions in millimetres Key 1 Adhesive 2 Substrate Figure 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
41、T 3). Other materials may be used, providing their thickness is adjusted as a function of their modulus of elasticity or they are bonded to a suitable stiffener before testing. DIN EN 1966:2009-07 EN 1966:2009 (E) 11 5.4 Test apparatus and measuring apparatus 5.4.1 Bending machine Bending machine ab
42、le to fracture the test piece at between 10% and 80% of the length of the scale of the force meter. The displacement 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
43、relation to the axis of displacement of the rod. The two support points consist of 6 mm diameter pins 33 mm apart (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 Supp
44、ort length 15 mm Figure 7 Test piece positioning device 5.4.3 Measuring apparatus The apparatus shall be capable 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. DIN EN 1966:2009-07 EN 1966:2009 (E) 12 6 Pre
45、paration of substrate surfaces before bonding The surface of substrate and which adhesion is to be measured shall 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
46、8) shall be performed under normal conditions: (23 2) C and (50 5) % relative humidity. Key 1 Securing (20 screws) 2 Securing plate 3 Adhesive 4 Substrate 5 Plate 6 Mould (rubber resin) Figure 8 Test piece preparation device DIN EN 1966:2009-07 EN 1966:2009 (E) 13 7.2 Inserting substrates Following
47、surface preparation, the substrates shall be placed in the seatings provided for this purpose on the lower plate of the 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. Mak
48、e sure that the cells do not suffer deformation. 7.3 Inserting adhesive Using the syringe, or another suitable device, 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 Har
49、dening Proceed with hardening in accordance with the instructions provided by the adhesive supplier. 7.5 Opening the mould 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 h before the test under the conditions specified in EN ISO 291, i.e. (23 2) C
