1、BRITISH STANDARD BS5350-C14: 1979 Methods of test for Adhesives Part C14:90 peel test for a rigid-to-rigid assembly UDC 665.93:620.179.4BS5350-C14:1979 This British Standard, havingbeen prepared under thedirectionof the Adhesives Standards Committee, was published under the authorityofthe Executive
2、Boardandcomes into effect on 31 August1979 BSI07-1999 The following BSI references relate to the work on this standard: Committee reference ADC/9 Draft for comment78/52220DC ISBN 0 580 10879 1 Foreword This Part of this British Standard has been prepared under the direction of the Adhesives Standard
3、s Committee. Peel testing of adhesive bonds is widely used for assessing the performance of adhesives and, because of the wide diversity of the flexibility of substrates which may be used, no single peel test will fulfil the requirements of all cases. This Part of this British Standard is intended t
4、o test an assembly consisting of two rigid adherends and is one of a series of peel tests. The other tests in this series are as follows: Part C9: Floating roller peel test; Part C10: Peel test for a flexible-to-rigid assembly; Part C11: 180 peel test for a flexible-to-rigid assembly; Part C12: 180
5、“T” peel test for a flexible-to-flexible assembly: Part C13: Climbing drum peel test. It should be understood that all tests in which one adherend is peeled from another involve complex stress distribution. At the separation of the adherends, there is a stress concentration resulting in rupture of t
6、he adhesive in the bond line, but there are other elements of force required to bend and strain the outer adherend. The force recorded is a compound of all these elements of force. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards a
7、re responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to4 and a back cover. This standard has been updated (see co
8、pyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date of issue CommentsBS5350-C14:1979 BSI 07-1999 i Contents Page Foreword Inside front cover 1 Scope 1 2 References 1 3 Defin
9、ition 1 4 Principle 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 Test jig for90 peel test for a rigid-to-rigid assembly 3 Figure 2 Test piece for90 peel test for a rigid-to-rigid assembly 4 Figure 3 Forming rol
10、lers 4 Figure 4 Typical peeling trace 4ii blankBS5350-C14:1979 BSI 07-1999 1 1 Scope This Part of this British Standard specifies a90 peel test for the determination, under specified conditions, of the peel resistance of a bonded assembly of adherends of similar modulus of rigidity. The test is suit
11、able only for materials which are capable of being bent around a former of radius75mm without fracturing or cracking. 2 References This Part makes reference to the following standards publications. BS903, Methods of testing vulcanized rubber Part A26: Determination of hardness. BS5214, Testing machi
12、nes for rubbers and plastics Part 1: Tensile, flexural and compression machines. BS5350, Methods of test for adhesives PartA1:Adherend preparation Part E1: Guide to statistical analysis. L152 (British Standard Aerospace Series), Aluminium-coated sheet and strip of aluminium-copper-magnesium-silicon-
13、manganese alloy (solution treated and artificially aged (Cu4.4, Mg0.5, Si0.8, Mn0.8). 3 Definition For the purposes of this Part of this British Standard the following definition applies. peel strength the force required to separate progressively the two members of a bonded test piece over the adher
14、end surfaces, under the specified conditions of test. It is expressed in newtons 4 Principle Adherends are separated at a substantially steady rate from an open edge of a prepared bond line so that the separation occurs progressively along the bond line. For the90 peel test for a rigid-to-rigid asse
15、mbly, the force is applied approximately normal to the plane of the bond through the separated test piece which has been preformed into a segment of a circle. 5 Apparatus 5.1 Tensile testing machine. The tensile testing machine shall comply with the requirements of BS5214-1 and it shall be of low in
16、ertia. 5.2 Test jig. A test jig is required to hold the test piece to the circumference of a sector of a cylinder, diameter150mm and width25mm (see Figure 1 for suitable arrangement). 5.3 Rollers. Rollers shall be used for initial shaping of the test piece (see Figure 3). 6 Test pieces 6.1 Adherends
17、. The adherends shall be two strips of flat material of dimensions 250mm 25 0.5mm and200mm 25 0.5mm. Both adherends shall be the same width and each shall be of uniform thickness. NOTEThe material commonly used for this test is aluminium coated aluminium alloy0.84mm thick complying with the requirem
18、ents ofL152 (British Standard Aerospace Series). 6.2 Preparation of test pieces. Unless otherwise specified the faying surfaces of the adherends shall be prepared in accordance with the requirements of Part A1 of this standard. Apply the adhesive over the whole width of the adherends to a length of1
19、50mm on each adherend as shown in Figure 2 by the method recommended by the manufacturer of the adhesive and bond the adherends using the methods recommended by the manufacturer of the adhesive. NOTE 1A convenient method of obtaining a sharp adhesive boundary is to place a thin strip of material to
20、which the adhesive does not adhere (abhesive strip) at the tag end of the panel. Alternatively, panels of suitable size shall be bonded and test pieces cut from the assembly, discarding12mm edges and taking care to avoid frictional heating and mechanical damage to the bond. If a press is used to mak
21、e the test piece it shall be capable of applying an even pressure over the entire bonded area and it should preferably be fitted with a time-release mechanism. In order to give a uniform distribution of pressure over the bonded area the platens of the press shall be parallel. Where this is impractic
22、able, one platen shall be covered with a resilient pad. NOTE 2A10mm thick pad of rubber of hardness approximately45 IRHD (see BS903-A26) has been found satisfactory on a press that applies a pressure up to700kPa. The preparation procedure shall be such as to minimize variations and the use of a pneu
23、matic or hydraulic press, hand or power operated, which can apply a pressure up to1MPa, is recommended. 6.3 Number of tests. The number of test pieces shall be as specified or, if the number is not specified, they shall be not less than three. (See also Part E1 of this standard.)BS5350-C14:1979 2 BS
24、I 07-1999 7 Conditioning and test atmosphere It is desirable that adherends should be prepared, stored and bonded and the assemblies conditioned and tested under standard conditions of temperature and humidity. Unless otherwise specified, the recommended conditions are a temperature of23 2 C and505%
25、r.h. 8 Procedure Using the forming rollers, bend the test piece to a75mm radius with the shorter strip on the inside (seeFigure2). Then bend the extending75mm tag into a right angle away from the inner strip. Clamp the test piece into the test jig and mount the jig in the testing machine as shown in
26、 Figure 1. Adjust the rate of separation of the strip so that the outer strip is pulled off at a rate of50 5mm/min. As the strip is pulled the drum section rotates, maintaining an angle of about90 between the adherends. Continue the test until at least125mm of the bonded area is separated. Note the
27、type of failure. 9 Expression of results Take the force indicated when the outer adherend has been peeled over a length of at least100mm, after disregarding the first25mm, as the peeling force. For each test piece determine from the curve of force/grip separation the average peeling force in newtons
28、. Determine the average force from the curve by drawing an average estimate line(seeFigure 4) or by using other suitable means if a more accurate result is required. Record the maximum and minimum force. Calculate the arithmetic mean of the results for all the test pieces. NOTEFor the statistical tr
29、eatment of results see Part E1 of this standard. 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) a description of the adherends including material thickness and surface preparation; c
30、) a description of the bonding process, including method of application of the adhesive, drying or precuring conditions (where applicable) and curing time, temperature and pressure; d) the average thickness (as precisely as possible) of the adhesive layer after formation of the bond; e) a complete d
31、escription of the test piece including dimensions and construction, and the number of test pieces; f) the conditioning procedure prior to testing and the test atmosphere; g) the rate of separation of the grips; h) the method of determining the average force; i) the average, maximum and minimum peeli
32、ng force values for each test piece in newtons, and the arithmetic mean of the results for all the test pieces; j) the type of failure for each test piece, i.e.adhesive, cohesive, adherend, or the degree of coalescence of the adhesive films; k) that the method of test complied with the requirements
33、of this standard, i.e.BS5350-C14, or, if it did not, the respects in which it did not comply.BS5350-C14:1979 BSI 07-1999 3 Figure 1 Test jig for90 peel test for a rigid-to-rigid assemblyBS5350-C14:1979 4 BSI 07-1999 Figure 3 Forming rollers Figure 4 Typical peeling traceblankBS5350-C14: 1979 BSI 389
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