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1、BRITISH STANDARD BS 5131-2.6: 1979 Methods of test for Footwear and footwear materials Part 2: Solings Section 2.6 Split tear strength of cellular solings NOTEIt is recommended that this Section should be read in conjunction with the information in the General introduction to BS 5131, published sepa
2、rately. UDC 685.31:620.1:685.312.122:539.412.1 BS 5131-2.6:1979 This British Standard, having been prepared under the direction of the Clothing Standards Committee, was published under the authority of the Executive Board on 31 January 1979 BSI 09-1999 The following BSI references relate to the work
3、 on this standard: Committee reference CLT/7 Draft for comment 77/35353 DC ISBN 0 580 10627 6 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 Standard does n
4、ot of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 3 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in t
5、he amendment table on the inside front cover. Amendments issued since publication Amd. No.Date of issueComments BS 5131-2.6:1979 BSI 09-1999i Contents Page 1Scope1 2Reference1 3Principle1 4Apparatus1 5Test pieces1 6Conditioning and testing atmosphere1 7Procedure1 8Calculation and expression of resul
6、ts2 9Test report2 Figure 2.6/1 Knife and splitting jig2 Figure 2.6/2 Test piece after preparation for test showing position of splits and reference lines3 ii blank BS 5131-2.6:1979 BSI 09-19991 1 Scope This Section describes a method for determining the split tear strength of all types of flexible c
7、ellular solings. The test can also be used for solid and semi-expanded solings but in these cases may be of limited application owing to the tendency of the tear to run quickly to one surface giving misleading results. This can also occur, but to a lesser extent, with cellular solings. NOTESection 2
8、.6 is based on SATRA1) Physical Test Method PM 65. 2 Reference This Section refers to the following standards publication: BS 5131, Methods of test for footwear and footwear materials Section 2.7: Preparation of soling test pieces (in course of preparation). 3 Principle A test piece is split for par
9、t of its length parallel to the surface of the rubber so that the split is midway between the two surfaces. The two tabs so formed are pulled apart and the maximum force required to propagate the split as a tear is determined. 4 Apparatus The following apparatus is required. 4.1 A low-inertia type t
10、ensile machine, preferably autographic, with a constant rate of traverse of 100 o 20 mm/min, a force range of 0 to 200 N and preferably higher and lower ranges also. 4.2 A splitting jig and knife to use for making the initial cuts. NOTEThe SATRA knife and jig STD 191 are suitable and are illustrated
11、 diagrammatically in Figure 2.6/1. 5 Test pieces Cut rectangles each measuring 75 mm I 25 mm, three in the direction along the soles or sheet material and three at right angles to this from samples which have already been reduced to the standard testing thickness for cellular solings of 5.0 o 0.2 mm
12、 by the procedure described in BS 5131-2.7. Using the splitting jig and knife, split one end of each test piece half-way between the top and bottom surfaces for a distance of approximately 15 mm. (The split should not be longer than 20 mm and the test is difficult if it is less than 12 mm.) Make sur
13、e the split portion ends in a clean cut. This forms two tongues at the end and leaves a piece approximately 60 mm I 25 mm intact. Turn the test piece round and cut the other end in the same way so that two ends are split and the centre portion is not. Draw two lines across the test piece 12 mm beyon
14、d the end of each split portion. A prepared test piece is then as shown in Figure 2.6/2. 6 Conditioning and testing atmosphere Condition the test material for at least 6 h at 20 o 2 pC after reducing it to the standard thickness and carry out the test in this atmosphere. The time interval between cu
15、tting out the test pieces and testing is not critical. 7 Procedure 7.1 Select the force range most suitable for the test; usually this is the 0 to 200 N range but occasionally strong materials give results above 200 N and for very weak materials it may be desirable to use a 0 to 100 N range to impro
16、ve the accuracy of the results. Fold back the two tongues at one end of the test piece and insert and clamp one in each jaw of the machine. 7.2 Start the machine so that the jaws separate at 100 mm/min, and record a trace of the force as the test continues. If autographic force recording is not avai
17、lable on the tensile machine being used, set it to show the maximum force reached during the test. When the test piece has been torn for 12 mm, which will be indicated by the line across the test piece, stop the test. The test piece might however tear to one surface before the 12 mm tear length is c
18、ompleted, in which case this is noted and the maximum force reached is measured. Clamp the other end of the test piece in the jaws and test in the same way. 1) Shoe and Allied Trades Research Association. BS 5131-2.6:1979 2 BSI 09-1999 7.3 Repeat for other test pieces cut in the same direction. 7.4
19、Test the test pieces cut in the other direction, in the same way. 8 Calculation and expression of results 8.1 For each direction of test record the highest force observed for each of the six tears and take the arithmetic mean of the three highest results. Divide this mean by the width of the test pi
20、ece (25 mm) and record the split tear strength in that direction as N/mm width, to one decimal place. 8.2 State how many (if any) of the three results contributing to the average were for tests which had torn to one surface within the specified 12 mm. 9 Test report Include the following items in the
21、 test report: a) the average tearing strength per unit width (split tear strength) for each direction, tested in accordance with 8.1; b) the number of test results in which the tear ran to one surface, in accordance with 8.2; c) the nature and full identification of the sample(s); d) reference to th
22、e method of test (i.e. BS 5131-2.6); e) the date of testing. Figure 2.6/1 Knife and splitting jig BS 5131-2.6:1979 BSI 09-19993 Figure 2.6/2 Test piece after preparation for test showing position of splits and reference lines BS 5131-2.6: 1979 BSI 389 Chiswick High Road London W4 4AL BSI British Sta
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