1、BRITISH STANDARD BS5131-5.6: 1991 Methods of Test for footwear and footwear materials Part5: Testing of complete footwear Section5.6 Impact test for rigid units and shoe bottoms NOTEIt is recommended that this Section should be read in conjunction with BS5131-0, published separately.BS5131-5.6:1991
2、This British Standard, having been prepared under the directionof the Textiles and Clothing Standards Policy Committee, was published underthe authority of the BoardofBSI and comesintoeffecton 31January1991 BSI12-1999 First published February1978 Second edition January1991 The following BSI referenc
3、es relate to the work on this standard: Committee referenceTCM/39 Draft for comment89/36235DC ISBN 0 580 18829 9 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Textiles and Clothing Standards Policy Committee (TCM/-) to Technical Commit
4、tee TCM/39, upon which the following bodies were represented: British Footwear Manufacturers Federation British Leather Confederation British Rubber Manufacturers Association British Steel plc Consumer Standards Advisory Committee of BSI Cork Industry Federation Footwear Components Federation Footwe
5、ar Distributors Federation Institute of Trading Standards Administration Iron and Steel Trades Confederation Lancashire Footwear Manufacturers Association Mail Order Traders Association of Great Britain Ministry of Defence National Union of Footwear, Leather and Allied Trades Office of Fair Trading
6、SATRA Footwear Technology Centre The following bodies were also represented in the drafting of the standard through subcommittees and panels: British Adhesives and Sealants Association British Paper and Board Industry Federation British Plastics Federation Multiple Shoe Retailers Association RAPRA T
7、echnology Ltd. Amendments issued since publication Amd. No. Date CommentsBS5131-5.6:1991 BSI 12-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Principle 1 3 Apparatus and materials 1 4 Preparation of units and moulds 1 5 Procedure 4 6 Expression of results 4 7
8、 Test report 4 Figure 1 Lateral impact tester 2 Figure 2 Determination of the clamping positions 3 Figure 3 Determination of the positions for applying impact 3 Figure 4 Position of the unit in the base mould fortheformation oftheresin blocks 5 Figure 5 Position of the unit and the resin blocks inth
9、eclamped assemblyfor testing 5BS5131-5.6:1991 ii BSI 12-1999 Foreword This Section of BS5131 has been prepared under the direction of the Textiles and Clothing Standards Policy Committee. It supersedes BS5131-5.6:1978, which is withdrawn. A British Standard does not purport to include all the necess
10、ary 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, pagesi andii, pages1 to
11、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.BS5131-5.6:1991 BSI 12-1999 1 1 Scope This Section of BS5131 describes a method of test designed to reproduce the
12、effect of the occasional heavy impacts that may occur in wear owing to stumbling or falling. The test is applicable to rigid through bottom units (often called clog units and through platform units) made from rigid plastics, rigid polyurethane, or wood, and to complete shoe bottoms containing these
13、units, i.e.with the insole and outsole left on. It is also suitable for testing complete bottoms containing cork units, but not for testing these cork units on their own. It is not applicable to more flexible units because they bend too much on impact. 2 Principle The unit is held rigidly in the for
14、epart and struck a number of blows of increasing severity at the heel until failure occurs, which is usually breaking or cracking in the waist. The energy required to produce a break or crack is measured. 3 Apparatus and materials 1) 3.1 Lateral impact tester, an example of a suitable apparatus bein
15、g shown in Figure 1. The apparatus is clamped either onto a solid built-in bench, or onto a rigid free-standing frame anchored to the floor. NOTEIf the apparatus is not firmly mounted, there is partial loss of energy on impact, thereby producing false results. The lateral impact tester has the follo
16、wing features. a) Pendulum, consisting of a circular steel bob of diameter108 1mm and thickness492mm which is fixed by a circular steel shaft of diameter25 0.5mm to a hub of diameter751mm, this hub being on a bearing axle. The distance from the centre of the bob to the centre of the hub is432 2mm. T
17、he moment of the pendulum when it is held horizontally is17.3 0.2Nm(1.76 0.02kgfm). b) Striker head, consisting of a strip of metal6.0 0.5mm thick,25 0.5mm wide and352mm long with the striking edge rounded to a radius of3.0 0.5mm. The head is fixed rigidly to the pendulum bob so that the striker tip
18、 and centre of the bob lie on the same circle of swing of the pendulum and are892mm apart. c) Energy scale for the pendulum, calibrated in increments of0.5J from0J to20J. A marker attached to the pendulum moves over this scale and enables the pendulum to be set up to deliver the desired energy of bl
19、ow. d) Base clamp, for holding the test specimen assembly and for adjusting it vertically and horizontally so that in the test the pendulum strikes the heel part of the unit in the correct position. The base clamp is attached to a guide rail in the main frame of the apparatus. This allows horizontal
20、 movement of the base clamp within the same vertical plane as the movement of the pendulum. 3.2 Curing resin filler, which is fairly fast setting but does not generate too much heat when doing so. 3.3 Silicone release agent 4 Preparation of units, moulds and resin blocks 4.1 If the bottom of a compl
21、ete shoe is to be tested cut away the upper level with the surface of the insole. 4.2 The procedure for determining the positions for clamping the unit and applying the impacts is given in4.3, 4.4, 4.5 and4.6 and is illustrated in Figure 2. 4.3 On the upper surface of the unit or the insole mark the
22、 extreme toe and heel points A and B, respectively. Draw in the line AB lightly and measure its length along the surface of the insole using a flexible steel ruler or tape. Mark on the line AB two points, C and D, so that CB=2/3 AB and DB=0.15AB. Lightly draw a line EF through C at right angles to A
23、B and mark its centre point I. Do the same for point D to obtain point J. Join points I and J with a heavier line and also draw lines KIL and MJN at right angles to IJ. During the test the unit will be clamped along the line KL. 4.4 Place the unit on a flat surface and draw lines LO and NP on the ed
24、ge of the unit, as shown in Figure 3, so that they are at right angles to the surface. Mark points O and P. Obtain and mark similar points Q and R on the other side of the unit. Draw lines OQ and PR on the underside of the unit. During the test the unit will be struck along the line PR. 1) For infor
25、mation on the availability of suitable apparatus and materials to perform this test, apply to Enquiry Section, BSI, Linford Wood, Milton Keynes, MK146LE quoting the number of this standard and the clause number referring to the items concerned. Enclose a stamped addressed envelope for reply.BS5131-5
26、.6:1991 2 BSI 12-1999 Figure 1 Lateral impact testerBS5131-5.6:1991 BSI 12-1999 3 4.5 Occasionally it happens that because of the design of the unit, points P and R, when determined according to4.4, do not fall on the heel or are very close to the front edge. In such a case locate P and R further ba
27、ck so that they fall on the heel and are at least5mm from this edge. Locate O and Q further back by the same distance so that OP is constant. Redraw the perpendicular lines OL and QK to obtain the new positions of K and L. 4.6 If it is evident that much of line PR is across a heel cavity fill this c
28、avity with a suitable hard setting resin. 4.7 Produce a base mould as shown in Figure 4 that has across it a flat bottomed trough50mm wide and5mm deep, and a rectangular top mould,50mm wide and longer than the width of the forepart. Using the base mould and top mould, together with the unit to be te
29、sted and the curing resin filler (3.2), produce a pair of blocks (moulded from curing resin filler to the shape of the upper and lower surfaces of the forepart of the unit), which will be used to clamp the unit securely and vertically in the impact tester. In order to do this, proceed as described i
30、n4.8 and4.9. Figure 2 Determination of the clamping positions Figure 3 Determination of the positions for applying impactBS5131-5.6:1991 4 BSI 12-1999 4.8 Spray the base mould, top mould and the surfaces of the forepart of the unit with silicone release agent (3.3). Mix sufficient curing resin fille
31、r(3.2) following the makers instructions. Fill the trough in the base mould with this resin so that the amount filled is a little wider than the forepart of the unit. Place the unit in the base mould as shown in Figure 4, so that line OQ on the underside of the unit coincides with the rear edge of t
32、he trough. Press the unit down to exude excess resin until the unit rests on this rear edge. Remove most of the excess resin. Apply a band of resin to the top surface of the unit approximately50mm wide so that its rear edge overlaps the line KL on that surface. Place the top mould on the resin so th
33、at it is horizontal and its edges are vertically above the edges of the trough in the base mould. Press the top mould down gently to exude resin until the minimum thickness of resin is about5mm. 4.9 Leave the resin to harden. If the compound used is fairly fast curing, dismantle the mould as soon as
34、 the resin is firm so as to avoid the possibility that the heat generated during the rest of the curing process might damage the unit. When the resin blocks are fully hardened, grind off excess material along their rear edges so that they fit accurately along the lines KL and OQ on the unit. 5 Proce
35、dure 5.1 Clamp the lateral impact tester (3.1) to a firm mounting using either screws or G clamps. Choose a position where, if the unit breaks and flies when tested, there is no risk of injury or damage to personnel or other equipment. Slacken the four nuts that tighten the clips that hold the unit
36、clamp assembly, and slide this assembly from under the pendulum framework along the guide rail. 5.2 Place the two moulded resin blocks in position on each side of the unit and insert the unit and blocks between the jaws SS of the clamp assembly (seeFigure 5) so that the underside of the heel faces t
37、he pendulum and the top edges of the blocks and jaws are in line with lines LO and KQ on the unit. Also ensure that the line IJ on the upper surface of the unit is central with respect to jaws SS and perpendicular to their upper edges. Tighten the nut T on each threaded rod. If the distance between
38、nuts T and U on each threaded rod is greater than80mm, undo nut U, remove bolt W, and slide frame X nearer to the unit until bolt W can be inserted in a suitable threaded hole in the case of the assembly. 5.3 Slacken the nuts U, V and Y and adjust the height of the jaws SS until the line PR on the h
39、eel of the unit is at the same height as the tip of the pendulum striker, either by using a ruler, or sliding the whole unit clamp assembly back to check against the pendulum. Make sure that the two threaded rods remain horizontal and that the line IJ on the unit remains vertical. Tighten the nuts Y
40、, then the nuts U and V together. Slide the unit clamp assembly back under the pendulum framework until the line PR on the underside of the heel just touches the tip of the striker when the pendulum is hanging freely. Reposition the four clips that hold the assembly to the base of the machine and ti
41、ghten them firmly. 5.4 The unit is now ready to be tested. Draw the pendulum back to the0.5J mark on the energy scale and release it so that the striker tip hits the underside of the heel. Catch the pendulum on its rebound to prevent a second blow. If there is no sign of cracking repeat the procedur
42、e, increasing the impact energy at each blow by0.5J until cracking (or a complete break) occurs (usually in the waist). A break or a crack along the line OQ where the unit is clamped is a valid result. Stop the test if a blow of20J does not produce a failure. Record the total number of blows deliver
43、ed. 5.5 If the unit deforms to such an extent that on impact the striker slides off the heel, this indicates that the unit is too flexible for the test to be appropriate. 6 Expression of results Record the number of blows and the setting on the energy scale of the blow that produces a break or crack
44、. If a blow of20J does not produce a failure, record this as “no crack obtained after the20J blow”. 7 Test report The test report shall include the following items: a) results, expressed in accordance with clause6; b) nature and full identification of the sample(s); c) reference to this method of te
45、st, i.e.BS5131-5.6; d) date of testing.BS5131-5.6:1991 BSI 12-1999 5 Figure 4 Position of the unit in the base mould for the formation of the resin blocks Figure 5 Position of the unit and the resin blocks in the clamped assembly for testingBS5131-5.6: 1991 BSI 389 Chiswick High Road London W4 4AL B
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