1、BRITISH STANDARDBS EN 14444:2005Structural adhesives Qualitative assessment of durability of bonded assemblies Wedge rupture testICS 83.180g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g
2、3g38g50g51g60g53g44g42g43g55g3g47g36g58corrigendum October 2008Incorporating National forewordThis British Standard is the UK implementation of EN 14444:2005, incorporating corrigendum October 2008.It is derived from ISO 10354:1992.The CEN common modifications have been implemented at the appropriat
3、e places in the text. The start and finish of each common modification is indicated in the text by tags .The UK participation in its preparation was entrusted to Technical Committee PRI/52, Adhesives.A list of organizations represented on this committee can be obtained on request to its secretary.Th
4、is publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.BS EN 14444:2005This British Standard was published under the authority of the Sta
5、ndards Policy and Strategy Committee on 26 November 2005 BSI 2009ISBN 978 0 580 66201 0Amendments/corrigenda issued since publicationDate Comments 31 October 2009 Implementation of CEN corrigendum October 2008. Penetration measurement modified in 5.2EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORME
6、N 14444October 2005ICS 83.180English VersionStructural adhesives - Qualitative assessment of durability of bonded assemblies - Wedge rupture test (ISO 10354:1992 modified)Adhsifs structuraux - valuation qualitative de la durabilit des assemblages colls - Essai de clivage au coin (ISO 10354:1992 modi
7、fie)Strukturklebstoffe - Qualitative Bestimmung der Bestndigkeit geklebter Baugruppen - Keilberstprfung (ISO 10354:1992 modifiziert)This European Standard was approved by CEN on 13 June 2005.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for
8、giving this European 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 Central Secretariat or to any CEN member.This European Standard exists in three official ve
9、rsions (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 Central Secretariat has the same status as the official versions.CEN members are the national standards bodies of Austria, Belgium,
10、 Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT E
11、UROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2005 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members.Ref. No. EN 14444:2005: EIncorporating corrigendum October 20082 Contents Page For
12、eword 3 1 Scope .4 2 Normative references .4 3 Principle.4 4 Safety .4 5 Apparatus 5 6 Procedure 5 6.1 Preparation of specimens 5 6.2 Number of specimens.6 6.3 Determination6 7 Expression of results7 8 Precision8 9 Test report .8 BS EN 14444:2005EN 14444:2005 (E) 3 Foreword This document (EN 14444:2
13、005) 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 April 2006, and conflicting nationa
14、l standards shall be withdrawn at the latest by April 2006. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, G
15、ermany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of International Standard ISO 10354:1992 was approved by CEN as a European Sta
16、ndard with agreed common modifications as given below: the title, scope and precision have been modified. A “Safety” clause has been introduced The common modifications have been inserted in the text of the reference document and indicated by a vertical line in the left margin. BS EN 14444:2005EN 14
17、444:2005 (E)4 1 Scope This document simulates in a qualitative manner mechanical forces and important environmental influences on an adhesive-bonded joint at a metal polymer interfaces it can also be used as a method of checking the surface preparation of substrates, with a limited detection level.
18、The test is applicable at the present time to the bonding of aluminium and titanium alloys using thermosetting structural adhesives and primers. NOTE This method can also be used for assessing surface preparation of other metals. Considerable caution in the evaluation of comparative results should b
19、e exercised in the event that the materials (adhesive plus adherend) and the specimen geometry are varied. Like should be compared with like (only similar adherends bonded with similar adhesives can be compared between themselves).2 Normative references The following referenced documents are indispe
20、nsable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN ISO 9142, Adhesives Guide to the selection of standard laboratory ageing conditions for test
21、ing bonded joints. (ISO 9142:2003) EN ISO 10365, Adhesives Designation of main failure patterns. (ISO 10365:1992) EN 13887, Structural adhesives Guidelines for surface preparation of metals and plastics prior to adhesive bonding. 3 Principle The test consists of the progressive introduction of a wed
22、ge between two plates bonded together with the adhesive under test. The length of the crack thus produced is measured, as is any propagation of the crack caused by laboratory ageing tests. 4 Safety Persons using this document shall be familiar with normal laboratory practice. This document does not
23、purport to address all the safety problems, if any, associated with its use. It is the responsibility of the user to establish safety and health practices and to ensure compliance with any European or national regulatory conditions.BS EN 14444:2005EN 14444:2005 (E) 5 5 Apparatus 5.1 Wedge, of a comp
24、osition which will not interact chemically with the adherends of the specimens being tested (electrolytic corrosion). Stainless-steel wedges have been found to work well many adherends and are very durable and reusable (see Figure 1). Dimensions in millimetres, except where indicated otherwise Figur
25、e 1 Dimensions of wedge 5.2 Device for driving the wedge, of any suitable design which provides slow and regular penetration (30 5) mm/min, but excludes the possibility of oblique penetration or oblique movement of the wedge. 5.3 Binocular magnifying glass, with a magnification between x 10 and x 40
26、. 5.4 Stopwatch, accurate to the nearest 1 s. 5.5 Thickness-measuring device, accurate to the nearest 0,01 mm. 6 Procedure 6.1 Preparation of specimens Specimens shall be prepared from two plates, bonded as shown in Figure 2, of dimensions 130 mm x 150 mm x (3 0,1) mm. Before bonding the plates, app
27、ly beyond the end of the zone to be bonded a strip of thin (less than 0,1 mm) anti-adhesive tape (see Figure 2) to prevent any bonding outside the required zone. Polytetrafluoroethylene is generally used as tape material. Prepare the surface in accordance with EN 13887 and bond the plates as specifi
28、ed by the manufacturer of the adhesive under test. Bring the bonded plates to a temperature of 23 C 2 C if necessary. Starting from the centreline cut four strips 27 mm in width and 150 mm in length from the bonded plates by sawing. Machine the sawn edges of these strips to give specimens 25 mm 0,1
29、mm in width. Alternatively, specimens measuring 150 mm x 27 mm x (3 0,1) mm may be prepared individually and machined to a width of 25 mm 0,1 mm after bonding.Determine, for each specimen, the average thickness of the adhesive layer bonding. To do this, make three measurements, to an accuracy of 0,0
30、1 mm, on each specimen and calculate the mean. BS EN 14444:2005EN 14444:2005 (E)6 Dimensions in millimetres Key 1 Discard 2 Four 150 x 25 specimens taken after bonding a) Zone covered by anti-adhesive tape b) Bonded zone Figure 2 Dimensions of bonded plate from which specimens are cut 6.2 Number of
31、specimens Conduct the test on at least 10 specimens. 6.3 Determination For each specimen, drive the wedge (5.1) fully home with the device (5.2) as shown in Figure 3. To accomplish this, open the end of the specimen that contains the anti-adhesive tape, and insert the wedge. Push the wedge into the
32、joint so as to permit slow and regular penetration at a speed of 30 mm/min 5 mm/min, positioning the wedge so that the end and sides are approximately flush with the sides of the specimen. BS EN 14444:2005EN 14444:2005 (E) 7 Determine the position of the crack on each side of the specimen by examina
33、tion with the binocular magnifying glass (5.3). Mark this position with a fine, indelible line. Measure the initial crack length, in millimetres, from the wedge/adherend contact point to the mark, on each edge of the specimen. Note the mean initial crack length lo. Age the specimen under of the sets
34、 of conditions specified in EN ISO 9142. After ageing, allow the specimen to stand for 60 min 10 min (see 5.4) at ambient conditions to stabilize. Measure the final length, in millimetres, of the crack on each edge of the specimen. Note the mean final crack length lF. Separate the two halves of the
35、specimens and determine the pattern of failure in accordance with EN ISO 10365. 7 Expression of results Determine, for each specimen, the average increase / in crack length, in millimetres, as a result of ageing (see Figure 4), using the equation : oF/ ll = Where lF and lo are as defined in 6.3. Det
36、ermine, for each type of failure, the arithmetic mean of /. Dimensions in millimetres, except where otherwise indicated Key 1 Bonded zone:115 Figure 3 Specimen with wedge BS EN 14444:2005EN 14444:2005 (E)8 Key 1 End of crack Figure 4 Evaluation of crack propagation 8 Precision The precision of this
37、test method is not known because inter-laboratory data are not available. But it is known that the test results do not only depend on interphase mechanism. Adhesion failure in this test only occurs if the water stability of the interphase is extremely low.9 Test report The test report shall include
38、the following information: a) a reference to this document; b) all details necessary for complete identification of the adhesive and the primer (if involved) tested, including its nature, its origin, the manufacturers reference number, the batch or mixture, its form, etc ; c) all details necessary f
39、or identification of the adherend material ; d) details of any surface preparation of the adherend plates ; e) a description of the bonding procedure, comprising the method of application of the adhesive, the drying or pretreatment conditions (where appropriate) and the bonding time, temperature and
40、 pressure ; f) the mean thickness of the adhesive layer in each specimen ; g) the ageing conditions used ; h) a description of the pattern of failure obtained with each specimen ; i) the initial crack length Loand final crack length LF, in millimetres in each case, for each specimen ; j) the arimthm
41、etic mean of Lofor each type of failure ; k) the increase / in crack length, in millimetres, caused by ageing for each specimen ; l) the arithmetic mean of / for each type of failure ; m) any deviation from the procedure specified in this document, especially any other plate thickness used. BS EN 14
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