《BS-5350-C13-1990.pdf》由会员分享,可在线阅读,更多相关《BS-5350-C13-1990.pdf(10页珍藏版)》请在三一文库上搜索。
1、BRITISH STANDARD BS 5350-C13: 1990 Methods of test for Adhesives Part C13: Climbing drum peel test UDC 665.93:620.179.4 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:03:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5350-C13:1990 This British Standard, having been prepared under the di
2、rection of the Adhesives Standards Policy Committee, was published under the authority of the Board of BSI and comes into effect on 28 September 1990 BSI 07-1999 First published September 1980 Second edition September 1990 The following BSI references relate to the work on this standard: Committee r
3、eference ADC/9 Draft for comment 89/53422 DC ISBN 0 580 18778 0 Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:03:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5350-C13:1990 BSI 07-1999i Contents Page Forewordii 1Scope1
4、2References1 3Definition1 4Principle1 5Apparatus1 6Test piece1 7Conditioning and testing atmosphere2 8Procedure2 9Expression of results2 10Test report2 Figure 1 Suitable peeling jig for climbing drum peel test3 Figure 2 Drum clamp4 Figure 3 Test piece for honeycomb structure4 Figure 4 Test piece for
5、 a sheet metal assembly5 Figure 5 Typical peeling trace5 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:03:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5350-C13:1990 ii BSI 07-1999 Foreword This Part of this British Standard has been prepared under the direction of the Adhesives Stand
6、ards Policy Committee. This edition introduces technical changes but it does not reflect a full review or revision of the standard, which will be undertaken in due course. This edition differs from the previous edition in that the scope has been amended to emphasize that the test is not intended to
7、be used for obtaining numerical design data, and the requirements concerning the conditioning and testing atmosphere have been clarified. 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
8、 may be used, no single peel test will fulfil the requirements of all cases. This Part of this British Standard is intended to test a rigid sandwich assembly of 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
9、: 90 peel test for a flexible-to-rigid assembly; Part C11: 180 peel test for a flexible-to-rigid assembly; Part C12: 180 “T” peel test for a flexible-to-flexible assembly; Part C14: 90 peel test for a rigid-to-rigid assembly. It should be understood that all peel tests in which one adherend is peele
10、d from another involve complex stress distribution, At the separation of the adherends, there is a stress concentration resulting in rupture of the adhesive in the bond line, but there are also other elements of force required to bend both adherends and to strain the more flexible adherend. The forc
11、e recorded is a compound of all these elements of force. The test does not necessarily reflect how an adhesive would perform in service. Such design data would usually be obtained using the construction materials and configurations used in an actual design. WARNING NOTE. This British Standard calls
12、for the use of substances and/or procedures that may be injurious to health if adequate precautions are not taken. It refers only to technical suitability and does not absolve the user from the legal obligations relating to health and safety at any stage. A British Standard does not purport to inclu
13、de all the necessary provisions of a contract. Users of British Standards are 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, pages
14、i and ii, pages 1 to 5 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:03:12 GMT+00:00 2006, Uncontrolled
15、 Copy, (c) BSI BS 5350-C13:1990 BSI 07-19991 1 Scope This Part of BS 5350 describes a climbing drum peel test for the determination, under specified conditions, of the resistance of joints to perpendicular peel stresses on the adhesive layer. It is applicable to the testing of joints between an oute
16、r metal sheet and the core of sandwich assemblies, e.g. honeycomb or other composites. This test is intended for ranking and quality control of adhesives and not for obtaining data for design purposes. 2 References This Part makes reference to the following standards publications: BS 5214, Testing m
17、achines for rubbers and plastics. BS 5214-1, Constant rate of traverse machines. BS 5350, Methods of test for adhesives. BS 5350-A1, Adherend preparation. BS 5350-E1, Guide to statistical analysis. 3 Definition For the purposes of this Part of this British Standard the following definition applies.
18、3.1 peel strength the force required to separate progressively the two members of a bonded test piece of specified dimensions over the adhered 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
19、edge of a prepared bond line so that the separation occurs progressively along the bond line. In the climbing drum peel test the adherends are separated by the action of a revolving drum which rotates by the application of a tensile force applied by a tensile testing machine. This force is the combi
20、nation of the true peeling force and the rolling force. 5 Apparatus 5.1 Tensile testing machine. The tensile testing machine shall comply with the requirements of BS 5214-1 and it shall be of low inertia. 5.2 Peeling jig, consisting of a flanged drum and flexible loading straps or cables as shown in
21、 Figure 1. The outside radius of the drum shall be 51.0 1.0 mm, and the radius of the flange, including one half of the thickness of the loading straps or cables, shall be 12.7 0.2 mm larger than the radius of the drum. NOTEThis 12.7 0.2 mm, less half the thickness of the adherend to be peeled, is t
22、he effective torque arm of the apparatus. A drum clamp (Figure 2) shall be used to hold the adherend against the face of the drum. The drum shall be balanced about the axis by the use of counterweights (as shown in Figure 1) placed diametrically opposite the drum clamp to compensate for the mass of
23、this clamp. The drum and flanges with the drum clamp and its compensating mass shall weigh not more than 3.6 kg, a lighter mass being preferable to facilitate handling of the apparatus. 6 Test piece 6.1 Types of test pieces 6.1.1 Honeycomb structure. The test piece shall consist of an assembly as sh
24、own in Figure 3. The longer adherend shall have a 30 mm tail at either end. 6.1.2 Sheet metal. The test piece shall consist of an assembly as shown in Figure 4. The longer adherend shall have a 30 mm tail at either end. 6.1.3 Other materials. The dimensions of the adherends shall be as specified in
25、the material specification. 6.2 Preparation of test pieces Prepare the faying surfaces of the adherends in accordance with Part A1 of this standard. Apply the adhesive and bond the adherends by the methods recommended by the manufacturer of the adhesive, either using individual test pieces, or, alte
26、rnatively, by bonding panels of suitable size and cutting test pieces from the assembly with a suitable tool such as a band saw, discarding 12 mm edges and taking care to avoid frictional heating or mechanical damage to the bond. 6.3 Number of tests The number of tests depends on the precision requi
27、red (see Part E1 of this standard) but shall be not less than three and shall be stated in the test report. NOTEThe number of test pieces used for the test should be agreed between the manufacturer and the user of the adhesive. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:03:12 GMT+00:0
28、0 2006, Uncontrolled Copy, (c) BSI BS 5350-C13:1990 2 BSI 07-1999 7 Conditioning and testing atmosphere As the storage conditions of the adherends and the times and environmental conditions obtaining during the curing, conditioning and storage of the bonded assemblies can have a substantial effect o
29、n results, either: a) the conditions shall comply with the instructions given by the manufacturer of the adhesive; or, if no conditions are specified by the manufacturer: b) the conditions for storage, curing and conditioning of the adherends and bonded assemblies shall be 23 2 C and 50 5 % r.h. The
30、 bonded assemblies shall be stored for at least 16 h before testing. The times and conditions shall be stated in the test report. 8 Procedure Determine the combination of peeling force and rolling force of an assembly as follows. Fix the test piece to the drum by one of the 30 mm tails as shown in F
31、igure 1. Fix the other tail of the test piece to the top grip of the testing machine. With the test piece on the peeling jig suspended from the top grip of the testing machine, fix the yoke to the bottom grip of the testing machine and adjust the force indicator to zero. Then set the machine in moti
32、on at the specified rate of separation of the grips to peel off the layer over a length of at least 150 mm. Report the rate of separation of the grips. NOTE 1The preferred rate is 25 mm/min. Record the force required to separate the adherends. NOTE 2Autographic recording is preferable. Continue the
33、test until at least 150 mm of bonded length is separated. Note the type of failure. To enable the true peel strength to be determined it is essential that compensation be made for other forces acting on the test piece. These forces are taken as the rolling force (F0) and three methods for estimating
34、 it are given below. a) Without compensation for the force exerted in bending the adherend. Insert a strip of fabric 300 mm long, 75 mm wide and 0.20 mm to 0.28 mm thick, having negligible stiffness, in place of the test piece. Determine the force sufficient to roll the drum upward. b) With compensa
35、tion for the force exerted in overcoming the stiffness of the adherend 1) Insert a piece of material of the same composition, properties and dimensions as the adherend to be peeled in place of the test piece. Determine the force sufficient to roll the drum upward. NOTE 1This method largely offsets t
36、he torque required to bend the adherend in the peel test. The forces imposed on the adherend during the peel test usually result in greater bending than is obtained when the unbonded adherend is wound round the drum. Therefore, more torque is required to bend a bonded adherend than an unbonded adher
37、end. Hence this compensation is only approximate. 2) At the close of the peel test reverse the direction of crosshead travel and record the force needed to unroll the peeled adherend. NOTE 2This method, again, is necessarily only an approximation because the condition of the adherend may have been a
38、ltered by the work put into it by rolling it around the drum. 9 Expression of results Take the force indicated when the adherends are peeled over a length of at least 150 mm, after disregarding the first 25 mm, as the peel force. For each test piece determine from the curve of force/grip separation
39、the average peeling force for the combination of the peeling force and the rolling force (F1) in newtons and the average for the rolling force (F0) in newtons. Determine these forces from the curves by drawing average estimate lines (see Figure 5) or, if a more accurate result is required, by using
40、other suitable means such as integration of the area under the trace. Record the maximum and minimum forces. Calculate the average peeling force (F) from the equation: F = F1 F0 where Calculate the arithmetic mean of the individual average peeling forces. NOTE 1Initial peak values, if required, may
41、be recorded separately. NOTE 2For the statistical treatment 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; Fis the peeling force (in newtons); F
42、1is the combined peeling force and rolling force (in newtons); F0is the rolling force (in newtons). Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:03:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5350-C13:1990 BSI 07-19993 b) a description of the adherends including material thickness
43、and surface preparation; c) 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
44、 the bond; e) a complete description 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 combination of the peel
45、ing force and rolling force (F1); i) the method of determining the rolling force (F0) and its average; j) the average, maximum and minimum peeling force values (F) for each test piece in newtons, and the arithmetic mean of the individual results; k) the type of failure for each test piece, i.e. whet
46、her adhesive, cohesive or adherend, and, if applicable, the degree of coalescence of the adhesive; l) that the method of test complied with the requirements of this standard, i.e. BS 5350-C13; m) any other factors that may have affected the result. Figure 1 Suitable peeling jig for climbing drum pee
47、l test Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:03:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5350-C13:1990 4 BSI 07-1999 Figure 2 Drum clamp Figure 3 Test piece for honeycomb structure Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:03:12 GMT+00:00 2006, Uncontrolle
48、d Copy, (c) BSI BS 5350-C13:1990 BSI 07-19995 Figure 4 Test piece for a sheet metal assembly Figure 5 Typical peeling trace Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:03:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5350-C13: 1990 BSI 389 Chiswick High Road London W4 4AL BSI Britis
49、h Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity
链接地址:https://www.31doc.com/p-3773249.html