1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 10768:2010Footwear Test methodfor the determination of theresistance of elastic materialsfor footwear to repeatedextension Fatigue resistance(ISO 10768:2010)BS EN ISO 1
2、0768:2010 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO10768:2010.The UK participation in its preparation was entrusted to TechnicalCommittee TCI/69, Footwear, leather and coated fabrics.A list of organizations represented on this committee can beobtained
3、on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2010ISBN 978 0 580 62921 1ICS 61.060Compliance with a British Standard cannot confer immunity fromlegal obligations.This British S
4、tandard was published under the authority of theStandards Policy and Strategy Committee on 31 July 2010Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 10768 July 2010 ICS 61.060 English Version Footwear - Test method for the determination
5、 of the resistance of elastic materials for footwear to repeated extension - Fatigue resistance (ISO 10768:2010) Chaussures - Mthode dessai pour la dtermination de la rsistance des lastiques de chaussures des extensions rptes - Rsistance la fatigue (ISO 10768:2010) Schuhe - Prfverfahren zur Bestimmu
6、ng der Bestndigkeit von elastischen Materialien fr Schuhe gegen wiederholte Dehnung - Ermdungsbestndigkeit (ISO 10768:2010) This European Standard was approved by CEN on 9 June 2010. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving t
7、his European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member. This European Standard exists in three official version
8、s (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, B
9、ulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE
10、FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 10768:2010: EBS EN ISO 10768:2010EN ISO
11、 10768:2010 (E) 3 Foreword This document (EN ISO 10768:2010) has been prepared by Technical Committee CEN/TC 309 “Footwear”, the secretariat of which is held by AENOR, in collaboration with Technical Committee ISO/TC 216 “Footwear“. This European Standard shall be given the status of a national stan
12、dard, either by publication of an identical text or by endorsement, at the latest by January 2011, and conflicting national standards shall be withdrawn at the latest by January 2011. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights
13、. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyp
14、rus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN ISO 10768:2010ISO 10768:2010(E
15、) ISO 2010 All rights reserved iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body int
16、erested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnic
17、al Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the
18、technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights.
19、ISO shall not be held responsible for identifying any or all such patent rights. ISO 10768 was prepared by Technical Committee ISO/TC 216, Footwear and by Technical Committee CEN/TC 309, Footwear in collaboration, in accordance with the Vienna Agreement. BS EN ISO 10768:2010BS EN ISO 10768:2010INTER
20、NATIONAL STANDARD ISO 10768:2010(E) ISO 2010 All rights reserved 1Footwear Test method for the determination of the resistance of elastic materials for footwear to repeated extension Fatigue resistance 1 Scope This International Standard specifies a test method for the determination of the resistanc
21、e of elastic materials for footwear, to repeated extension produced during normal walking. The test can be carried out before and after accelerated ageing. This method is applicable to any elastic material used for footwear. 2 Normative references The following referenced documents are indispensable
22、 for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 10765, Footwear Test method for the characterization of elastic materials Tensile performance ISO
23、 18454, Footwear Standard atmospheres for conditioning and testing of footwear and components for footwear 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 elastic tape, cord or fabric containing rubber or a similar substance allowing it to st
24、retch and return to its original shape NOTE Generally elastic materials are used in upper construction in the quarters or in the straps to hold the shoe on the foot. 4 Apparatus and materials 4.1 Sewing machine, with a round point needle metric size 90s or 70s, a nylon or polyester thread (approxima
25、tely tex 17/3) and operating at 6 stitches/cm. 4.2 Repeated extension machine, with a minimum separation of (60 10) mm, a maximum separation that is fully adjustable up to a distance equal to the minimum separation plus 150 mm, a method of applying a simple harmonic reciprocating action to increase
26、the distance between the clamps from the minimum to the maximum separation and back again at a rate of (60 5) cycles per minute and a means of recording the number of cycles. 4.3 Chamber, at (70 2) C for the accelerated ageing process. BS EN ISO 10768:2010ISO 10768:2010(E) 2 ISO 2010 All rights rese
27、rved4.4 Steel ruler or callipers. 4.5 Polyurethane (PU) coagulated woven fabric, of thickness of approximately 1 mm. 5 Sampling and conditioning 5.1 Sampling 5.1.1 The dimensions of test pieces are shown in Figure 1. 5.1.2 Cut three test pieces of elastic, measuring (65 5) mm. If accelerated ageing
28、is going to be carried out, cut three more test pieces. The width dimension must be suitable to the dimension of the clamps so that the sample can be clamped properly in the fatigue equipment. 5.1.3 Mark on the test pieces a (15 0,5) mm line parallel to both ends by means of the steel ruler (4.4). 5
29、.1.4 For each test piece cut four pieces of the coagulated fabric, with the following dimensions: length of 30 mm; width equal to sample width plus 10 mm (minimum 30 mm). 5.1.5 On each of the square pieces, mark a line that is parallel to the width edge and 5 mm from it (AB, in Figure 1). 5.1.6 Stic
30、k a piece of double-sided tape on the uncoated side of one of the coated fabric squares. Place it on the elastic test piece so that the line drawn on the elastic is perfectly aligned with the edge of the square piece where the AB line has been drawn. Turn the sample around and place another coated f
31、abric square on the elastic, now with the coated side facing upwards. The two coated fabric squares should be in line with each other. Press the assembly to ensure that they are bonded. Repeat the process on the other end of the test piece. 5.1.7 Prepare the other two samples in the same way. 5.1.8
32、Using the sewing machine (4.1), sew the three test pieces at each end, along the AB line. 5.2 Conditioning Samples and test pieces shall be conditioned for at least 24 h at (23 2) C and (50 5) % of relative humidity (RH) before testing, in accordance with ISO 18454. BS EN ISO 10768:2010ISO 10768:201
33、0(E) ISO 2010 All rights reserved 3Dimensions in millimetres Key 1 coated fabric 2 stitching 3 line drawn on elastic 4 elastic Figure 1 Dimensions of a standard test piece in millimetres 6 Procedure 6.1 Damage of the elastic is evaluated after being submitted to repeated extensions of 150 % of its i
34、nitial length or until the limit of useful extension (see ISO 10765). 6.2 Once the test pieces are prepared, measure the distance between the seams at both ends as well as the test piece width, to the nearest 0,5 mm. There should not be more than a 2 mm difference in the measurements. Calculate the
35、arithmetic mean of the three values to the nearest 0,5 mm. 6.3 Before starting the test, examine the test piece under bright lighting conditions and record the number of elastic threads of the sample. 6.4 The limit of useful extension of the elastic material is needed so as to know the maximum stret
36、ch that can be applied. It is determined in accordance with ISO 10765. If the useful extension is W 150 %, the maximum stretch to apply is 150 %. If the useful extension is 150 %, the maximum stretch to apply is equal to the useful extension value. BS EN ISO 10768:2010ISO 10768:2010(E) 4 ISO 2010 Al
37、l rights reserved6.5 Clamp the test piece in the equipment. The jaws should be on the minimum separation, so that the length of the sample is at right angles to the edge of the jaws. When clamped, the test piece should be neither stretched nor slack. Furthermore, the seams must not be clamped. 6.6 O
38、nce the test piece is clamped, calibrate the equipment so that the maximum distance between the jaws during each cycle corresponds to the maximum elongation value. 6.7 Switch on the machine at a test speed of (60 5) cycles per minute until 2 000 cycles have been completed. Then, examine the test pie
39、ce again and record the amount of broken elastic threads, as well as any signs of visible damage, such as wrinkling. 6.8 If more than 10 % of the test pieces elastic threads are broken or if it has wrinkled severely, the test is complete. 6.9 If the test piece does not appear to be damaged, carry ou
40、t another 2 000 cycles and examine it once more. Continue this process until 10 000 cycles have been carried out or until any damage appears. 6.10 Repeat the procedure for the other two samples. 6.11 When test pieces are subjected to ageing, store the cut test pieces at 70 C for 7 d. Take out the sa
41、mples after 7 d, and leave them to condition in a controlled atmosphere at (23 2) C and (50 5) % relative humidity (RH), for at least 48 h. Prepare the test pieces and test them according to the procedure described in 6.1 to 6.10. 7 Expression of results The results are expressed as a percentage of
42、the broken threads at the end of the test and shall be calculated using Equation (1). b0% 100nn= (1) where nbis the number of elastic thread broken; n0is the number of elastic thread at the start of the test. The final result shall be the arithmetic mean of the three test pieces. If it is not possib
43、le to distinguish the elastic threads, the test result will be an evaluation of the materials damage after a determined number of cycles. 8 Test report The test report shall include, at least, the following information: a) reference to this test standard (i.e. ISO 10768:2010); b) a full description
44、of the elastic material; c) the total number of extension cycles; d) a description of damage wrinkling, elastic threads broken (%), etc.; BS EN ISO 10768:2010ISO 10768:2010(E) ISO 2010 All rights reserved 5e) if accelerated ageing was carried out, the values of number of extension cycles and the amo
45、unt of damage for the test after accelerated ageing; f) any deviations from this method. This page deliberately left blankBSI is the independent national body responsible for preparing British Standardsand other standards-related publications, information and services. It presents the UK view on sta
46、ndards in Europe and at the international level. It is incorporated by Royal Charter.British Standards Institution (BSI)raising standards worldwideBSI Group Headquarters389 Chiswick High Road London W4 4AL UKTel +44 (0)20 8996 9001Fax +44 (0)20 8996 Standards are updated by amendment or revision. U
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