1、BRITISH STANDARD BS 5131-4.8: 1990 Methods of test for Footwear and footwear materials Part 4: Other components Section 4.8 Resistance of heels of ladies shoes to lateral impact NOTEIt is recommended that this Section should be read in conjunction with BS5131-0, publishedseparately.BS5131-4.8:1990 T
2、his British Standard, having been prepared under the directionof the Textiles and Clothing Standards Policy Committee, was published underthe authority of the BoardofBSI and comes intoeffecton 31 December 1990 BSI 09-1999 First published February 1975 Second edition December 1990 The following BSI r
3、eferences relate to the work on this standard: Committee reference TCM/39 Draft for comment 89/36229 DC ISBN 0 580 18748 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 Techni
4、cal Committee 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 Federat
5、ion Footwear 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 Fai
6、r Trading 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 Associat
7、ion RAPRA Technology Ltd. Amendments issued since publication Amd. No. Date CommentsBS5131-4.8:1990 BSI 09-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Principle 1 3 Apparatus and material 1 4 Preparation of test specimen assemblies 2 5 Procedure 3 6 Express
8、ion of results 3 7 Test report 3 Figure4.8/1Lateral impact tester 1 Figure4.8/2Metal mounting tray with heel in position before addition of molten alloy 2BS5131-4.8:1990 ii BSI 09-1999 Foreword This Section of BS 5131 has been prepared under the direction of the Textiles and Clothing Standards Polic
9、y Committee. It supersedes BS 5131-4.8:1975, which is withdrawn. 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 not of itself confer immunity
10、from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1to3 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 f
11、ront cover.BS5131-4.8:1990 BSI 09-1999 1 1 Scope This Section of BS 5131 describes a method for determining the impact strength of the heels of ladies shoes. The result provides an assessment of the liability to failure under the occasional heavy blows received during wear. NOTEWhile the method is a
12、pplicable to all types of high heels, of whatever construction, it is particularly useful for injection-moulded plastics heels which incorporate a steel dowel reinforcement, giving information on the suitability of the dowels hardness or softness. Heels which by virtue of their shape have a high lat
13、eral impact resistance do not normally require to be tested in this way. 2 Principle A heel, clamped with the tip uppermost and the stem approximately vertical, is subjected repeatedly to measured blows from a pendulum striker, the energy of the blows increasing successively until the heel fails. 3
14、Apparatus and material 1) 3.1 Lateral impact tester, an example of a suitable apparatus being shown in Figure 4.8/1. The apparatus is clamped either onto a solid built-in bench, or onto a rigid free-standing frame anchored to the floor. 1) For information on the availability of suitable apparatus an
15、d material to perform this test, apply to Enquiry Section, BSI, Linford Wood, Milton Keynes, MK14 6LE quoting the number of this standard and the clause number referring to the items concerned. Enclose a stamped addressed envelope for reply. Figure 4.8/1 Lateral impact testerBS5131-4.8:1990 2 BSI 09
16、-1999 The lateral impact tester has the following features: a) pendulum, consisting of a circular steel bob of diameter 1081mm and thickness 49 2mm which is fixed by a circular steel shaft of diameter25 0.5mm to a hub, on the bearing axle, of diameter 75 1mm. The distance from the centre of the bob
17、to the centre of the hub is4322mm. The moment of the pendulum when it is held horizontally is17.3 0.2Nm(12.7 0.2ftlbf); b) striker head, consisting of a strip of metal6.0 0.5mm thick, 25.0 0.5mm wide and35 2mm long with the striking edge rounded to a radius of 3.0 0.5mm. The head is fixed rigidly to
18、 the pendulum bob so that the striker tip and centre of the bob lie on the same circle of swing of the pendulum and are89 2mm apart. c) energy scale for the pendulum, calibrated in increments of 0.68J (0.50 ftlbf) from 0J(0 ftlbf) to18.3J (13.5 ftlbf). A marker attached to the pendulum moves over th
19、is scale and enables the pendulum to be set up to the desired energy of blow; d) base clamp, for holding the metal mounting tray (3.2) and for adjusting it vertically and horizontally to achieve correct alignment of the heel tip. NOTEIf the apparatus is not firmly mounted, there is partial loss of e
20、nergy on impact, thereby producing false results. 3.2 Metal mounting trays, as illustrated in Figure 4.8/2, each to contain a heel set in metal alloy of melting point between100 C and 150 C. 3.3 Metal alloy, melting point between 100 C and150 C. 4 Preparation of test specimen assemblies 4.1 Take thr
21、ee heels and set each heel in a dry metal mounting tray (3.2) using the procedure described in 4.2 or, for very short heels (usually those below40mm in height), the procedure described in4.3. 4.2 Place the heel centrally in the tray so that the seat breast edge is against a flat end of the tray, and
22、 the heel tip points upwards. Pour molten metal alloy(3.3) at a suitable minimum temperature into the tray, filling the space around the heel to within3mm from the top. Allow the alloy to cool and set thereby providing a rigid mounting for the heel. 4.3 Since some very short heels cannot be struck c
23、orrectly by the striker if mounted in accordance with4.2 (because the bottom of the pendulum catches the base clamp assembly), a different method of mounting is necessary. In such cases mount the heel with the rear of the heel seat against a flat end of the tray. Cut a small amount from the rear of
24、the heel so as to set the heel further towards the rear of the mounting tray if this allows the striker to strike the heel correctly. Figure 4.8/2 Metal mounting tray with heel in position before addition ofmolten alloyBS5131-4.8:1990 BSI 09-1999 3 5 Procedure 5.1 Position a test specimen assembly i
25、n the lateral impact tester (3.1), sliding the assembly up the inclined plane of the base clamp as far as possible and locking into position with the back of the heel facing the pendulum. Set the test specimen assembly at a suitable angle to the horizontal so that the blow will be applied at right a
26、ngles to the heel stem. Adjust the clamp so that the heel just contacts the striker when the pendulum is vertical, with the tip of the heel 6mm above the striker tip. 5.2 Lift the pendulum to the 0.68J (0.50 ftlbf) position and release, so that the striker falls against the heel stem. Catch the pend
27、ulum on its rebound to prevent a second blow. Repeat this procedure, increasing the impact energy at each blow by0.68J(0.50ftlbf) either until the heel stem breaks, until it bends and the pendulum jams, or until an impact energy of 18.3 J (13.5 ftlbf) has been applied. Record the total number of blo
28、ws delivered. 5.3 Damage involving fracture or cracking of the heel at the point of impact of the striker is regarded as invalid in this test, since it is due to the effect of the striker acting as a chisel rather than fracture of the heel due to impact at the heel as in wear. If such damage occurs,
29、 report it together with this explanation. 5.4 Test the other two heels by the same procedure. 6 Expression of results Express the result for each of the three heels as follows: a) the number of blows to failure (or that no failure occurred after 27 blows) and the energy inJ(ftlbf) of the last blow;
30、 b) the type of failure, as described in 5.2, or the fact that damage involving fracture or cracking of the heel at the point of impact occurred, as described in 5.3 7 Test report The test report shall include the following items: a) results for each heel, expressed in accordance with clause 6; b) n
31、ature and full identification of the sample; c) reference to this method of test, i.e. BS 5131-4.8; d) date of testing.BS5131-4.8: 1990 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents
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