1、BRITISH STANDARD CONFIRMED SEPTEMBER 1991 BS 5350-C1: 1986 Methods of test for Adhesives Part C1: Determination of cleavage strength of adhesive bonds UDC 665.93:620.179.4:620.17BS5350-C1:1986 This British Standard, having been prepared under the directionof the Adhesive Standards Committee, was pub
2、lished under the authority ofthe Board of BSI and comes intoeffect on 31 January 1986 BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference ADC/9 Draft for comment 84/52390 DC ISBN 0 580 14938 2 Amendments issued since publication Amd. No. Date of issue Co
3、mmentsBS5350-C1:1986 BSI 07-1999 i Contents Page Foreword ii 0 Introduction 1 1 Scope 1 2 Definitions 1 3 Principle 1 4 Supplementary information 1 5 Apparatus 1 6 Test pieces 1 7 Conditioning and test atmosphere 2 8 Procedure 2 9 Expression of results 2 10 Test report 2 Figure 1 Adaptor and pin 3 F
4、igure 2 Adherend 3 Figure 3 Test piece 4 Figure 4 Test assembly 5 Publications referred to Inside back coverBS5350-C1:1986 ii BSI 07-1999 Foreword This Part of BS 5350 has been prepared under the direction of the Adhesives Standards Committee. It is one of a series of methods for testing the mechani
5、cal strength properties of adhesively bonded joints, published as separate Parts of Group C of this standard. WARNING NOTE. This British Standard calls for the use of substances and/or procedures which may be injurious to health if adequate precautions are not taken. It refers only to technical suit
6、ability and does not absolve the user from legal obligations relating to health and safety at any stage. 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 Stan
7、dard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1to6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporate
8、d. This will be indicated in the amendment table on the inside front cover.BS5350-C1:1986 BSI 07-1999 1 0 Introduction The strength of an adhesive joint partly depends on the type of stress placed upon it. A stress applied in cleavage mode to a joint between two rigid adherends may induce failure at
9、 a load which is low, compared, for example, to that producing tensile or shear mode failure. The cleavage strength of a joint may therefore be a critical factor in the strength of the structure of which it is a part. In this method, a rigid joint is subjected to cleavage stress by application of a
10、tensile force at one edge of the joint. The standard may be used both for assessing compliance of an adhesive with a specification and for quality control. 1 Scope This Part of BS 5350 describes a method for the assessment of the cleavage strength of adhesive bonds between rigid materials under spec
11、ified conditions. NOTEThe titles of the publications referred to in this Part of BS5350 are listed on the back page. 2 Definitions For the purposes of this Part of BS5350, the following definitions, taken from BS6138, apply. 2.1 cleavage strength the force necessary to bring an adhesive assembly to
12、the point of failure by the application of force in cleavage mode 2.2 cleavage a mode of application of a force to a joint between rigid adherends which is not uniform over the whole area but which results in a stress concentrated at one edge 2.3 faying surface the portion of a surface that is prepa
13、red for bonding to another prepared surface; the portion of a surface bonded or joined to a cleaned surface 3 Principle A butt joint of specified dimensions and form is subjected to a cleavage force and the breaking force determined. 4 Supplementary information This method of test requires the follo
14、wing supplementary information, which shall be specified when this method is called up. a) A description of the adherends and, if other than as specified inFigure 2, their dimensions. b) Details of the pretreatment of the adherends. c) Details of the application of the adhesive, including the covera
15、ge or bond-line thickness, the number of coats applied to one or both surfaces and the drying conditions. d) The method of making the joint, including details of the bonding pressure, temperature, curing and whether the adhesive fillet is removed. If the curing temperature is given, it shall be stat
16、ed whether it is that of the bond line or the atmosphere in which the assembly is to be maintained. e) Details of both the conditioning of the test piece before testing and the test atmosphere. 5 Apparatus 5.1 Testing machine. The machine shall comply with the requirements for grade A of BS5214-2. I
17、t shall include grips which are self-aligning so that the force applied to the test piece is normal to the plane of the bond. 5.2 Adaptors, as shown inFigure 1. 6 Test pieces 6.1 Adherends The adherends shall be of the same rigid material. NOTE 1Steel is the preferable material of construction; for
18、example, low carbon steel 055M15 complying with BS970. NOTE 2BS 5350-A2, which covers the selection of adherends, is in preparation. The form shall be as shown inFigure 2 and the dimensions, unless otherwise specified, shall be as shown inFigure 2. 6.2 Preparation of adherends Prepare the faying sur
19、faces of the adherends in accordance with the recommendations of the adhesives manufacturer. In the absence of such recommendations, select an appropriate procedure from those specified in BS5350-A1.BS5350-C1:1986 2 BSI 07-1999 6.3 Preparation of test pieces Apply the adhesive to the faying surfaces
20、 of the prepared adherends in accordance with the recommendations of the adhesives manufacturer. Bond the adherends in accordance with the recommendations of the adhesives manufacturer to form a test piece as shown inFigure 3. The bond line to which the force is applied shall be plane. To this end,
21、take precautions to ensure that there is neither a protruding fillet of adhesive nor flaws in the bond line along the cleaving edge in the bonded test piece. Unless otherwise specified, remove the adhesive fillet, preferably by wiping before the adhesive sets. 6.4 Number of test pieces Not less than
22、 five test pieces shall be tested. NOTEThe number of test pieces depends on the precision required (seeclause8 of BS5350-E1:1976). 7 Conditioning and test atmosphere The adherends shall be prepared, stored and bonded, and the test pieces conditioned and tested under standard conditions of temperatur
23、e and humidity. Unless otherwise specified, these conditions shall be a temperature of23 2 C and a relative humidity of505%r.h. 8 Procedure Attach the conditioned test piece to the adaptors(5.2), as shown in Figure 4, and mount in the testing machine (5.1), taking care to align the test piece. Opera
24、te the testing machine so that the test piece is subject to a force that increases at a constant rate and such that the test piece is broken in not less than20s and not more than90s. Record the force at break, in newtons, the mode of failure, i.e.whether adhesive, cohesive or in the adherend, and th
25、e degree of coalescence of the adhesive film. 9 Expression of results Express the cleavage strength as the arithmetic mean, in newtons, of the breaking force for all test pieces which have broken as a result of failure in the adhesive, and give an indication of the spread of results, e.g. as the sta
26、ndard deviation (see BS5350-E1). 10 Test report The report shall state the following: a) a designation of the adhesive, giving all information required for complete identification of the sample; b) the items and values of supplementary information given in clause4; c) the rate of application of the
27、force; d) the number of test pieces tested, the mean breaking force (in newtons) and information concerning the spread of results; e) the type of failure for each test piece, and the degree of coalescence of the adhesive film; f) that the method of test was conducted in accordance with this Part of
28、BS5350 or, if it was not, deviations from the method.BS5350-C1:1986 BSI 07-1999 3 Figure 1 Adaptor and pin Figure 2 AdherendBS5350-C1:1986 4 BSI 07-1999 Figure 3 Test pieceBS5350-C1:1986 BSI 07-1999 5 Figure 4 Test assembly6 blankBS5350-C1:1986 BSI 07-1999 Publications referred to BS 970, Specificat
29、ion for wrought steels for mechanical and allied engineering purposes. BS 5214, Specification for testing machines for rubbers and plastics. BS 5214-2, Constant rate of force application machines. BS 5350, Methods of test for adhesives. BS 5350-A1, Adherend preparation. BS 5350-E1, Guide to statisti
30、cal analysis. BS 6138, Glossary of terms used in the adhesives industry. BS 5350-C1: 1986 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the
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