1、December 2010 Translation by DIN-Sprachendienst.English price group 7No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).IC
2、S 61.060!$lo“1735976www.din.deDDIN EN ISO 10768Footwear Test method for the determination of the resistance of elastic materialsfor footwear to repeated extension Fatigue resistance (ISO 10768:2010)English translation of DIN EN ISO 10768:2010-12Schuhe Prfverfahren zur Bestimmung der Bestndigkeit von
3、 elastischen Materialien fr Schuhegegen wiederholte Dehnung Ermdungsbestndigkeit (ISO 10768:2010)Englische bersetzung von DIN EN ISO 10768:2010-12Chaussures Mthode dessai pour la dtermination de la rsistance des lastiques dechaussures des extensions rptes Rsistance la fatigue (ISO 10768:2010)Traduct
4、ion anglaise de DIN EN ISO 10768:2010-12www.beuth.deDocument comprises pagesIn case of doubt, the German-language original shall be considered authoritative.1012.10 DIN EN ISO 10768:2010-12 2 A comma is used as the decimal marker. National foreword This standard has been prepared by Technical Commit
5、tee CEN/TC 309 “Footwear” (Secretariat: AENOR, Spain) in collaboration with Technical Committee ISO/TC 216 “Footwear”. The responsible German body involved in its preparation was the Normenausschuss Materialprfung (Materials Testing Standards Committee), Working Committee NA 062-04-52 AA Schuhe. The
6、 DIN Standard corresponding to the International Standard referred to in this document is as follows: ISO 10765 DIN EN ISO 10765 National Annex NA (informative) Bibliography DIN EN ISO 10765, Footwear Test method for the characterization of elastic materials Tensile performance EUROPEAN STANDARD NOR
7、ME EUROPENNE EUROPISCHE NORM EN ISO 10768 July 2010 ICS 61.060 English Version Footwear - Test method for the determination 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
8、des lastiques de chaussures des extensions rptes - Rsistance la fatigue (ISO 10768:2010) Schuhe - Prfverfahren zur Bestimmung der Bestndigkeit von elastischen Materialien fr Schuhe gegen wiederholte Dehnung - Ermdungsbestndigkeit (ISO 10768:2010) This European Standard was approved by CEN on 9 June
9、2010. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtaine
10、d on application to the CEN Management Centre or to any CEN member. This European Standard exists in three official versions (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 Managemen
11、t Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands
12、, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE 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
13、 form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 10768:2010: EContents DIN EN ISO 10768:2010-12 EN ISO 10768:2010 (E) 2 Page Foreword3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Apparatus and materials.4 5 Sampling and conditioning.5 5.1 Sampli
14、ng.5 5.2 Conditioning.5 6 Procedure .6 7 Expression of results 7 8 Test report 7 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
15、European Standard shall be given the status of a national standard, 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
16、 elements of this document may be the subject of patent rights. 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 th
17、is European Standard: Austria, Belgium, Bulgaria, 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, Switzerlan
18、d and the United Kingdom. “DIN EN ISO 10768:2010-12 EN ISO 10768:2010 (E) 3 1 Scope This International Standard specifies a test method for the determination of the resistance of elastic materials for footwear, to repeated extension produced during normal walking. The test can be carried out before
19、and after accelerated ageing. This method is applicable to any elastic material used for footwear. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the lates
20、t edition of the referenced document (including any amendments) applies. ISO 10765, Footwear Test method for the characterization of elastic materials Tensile performance ISO 18454, Footwear Standard atmospheres for conditioning and testing of footwear and components for footwear 3 Terms and definit
21、ions 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 stretch and return to its original shape NOTE Generally elastic materials are used in upper construction in the quarters or in t
22、he 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 (approximately tex 17/3) and operating at 6 stitches/cm. 4.2 Repeated extension machine, with a minimum separation of (60 10) mm, a maxi
23、mum 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 the distance between the clamps from the minimum to the maximum separation and back again at a rate of (60 5) cycles per minut
24、e and a means of recording the number of cycles. 4.3 Chamber, at (70 2) C for the accelerated ageing process. DIN EN ISO 10768:2010-12 EN ISO 10768:2010 (E) 4 4.4 Steel ruler or callipers. 4.5 Polyurethane (PU) coagulated woven fabric, of thickness of approximately 1 mm. 5 Sampling and conditioning
25、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 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 ca
26、n 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). 5.1.4 For each test piece cut four pieces of the coagulated fabric, with the following dimensions: length of 30 mm; width equal to sample width pl
27、us 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 Stick 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 draw
28、n 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 fabric 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
29、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 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 condi
30、tioned for at least 24 h at (23 2) C and (50 5) % of relative humidity (RH) before testing, in accordance with ISO 18454. DIN EN ISO 10768:2010-12 EN ISO 10768:2010 (E) 5 Dimensions in millimetres Key 1 coated fabric 2 stitching 3 line drawn on elastic 4 elastic Figure 1 Dimensions of a standard tes
31、t piece in millimetres 6 Procedure 6.1 Damage of the elastic is evaluated after being submitted to repeated extensions of 150 % of its initial 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
32、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 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 numb
33、er 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 stretch 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 exte
34、nsion is 150 %, the maximum stretch to apply is equal to the useful extension value. DIN EN ISO 10768:2010-12 EN ISO 10768:2010 (E) 6 6.5 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.
35、When clamped, the test piece should be neither stretched nor slack. Furthermore, the seams must not be clamped. 6.6 Once 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 m
36、achine at a test speed of (60 5) cycles per minute until 2 000 cycles have been completed. Then, examine the test piece 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 broke
37、n or if it has wrinkled severely, the test is complete. 6.9 If the test piece does not appear to be damaged, carry out 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 t
38、wo samples. 6.11 When test pieces are subjected to ageing, store the cut test pieces at 70 C for 7 d. Take out the samples 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 accor
39、ding to the procedure described in 6.1 to 6.10. 7 Expression of results The results are expressed as a percentage of 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
40、at the start of the test. The final result shall be the arithmetic mean of the three test pieces. If it is not possible 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,
41、at least, the following information: a) reference to this test standard (i.e. ISO 10768:2010); b) a full description of the elastic material; c) the total number of extension cycles; d) a description of damage wrinkling, elastic threads broken (%), etc.; DIN EN ISO 10768:2010-12 EN ISO 10768:2010 (E) 7 e) if accelerated ageing was carried out, the values of number of extension cycles and the amount of damage for the test after accelerated ageing; f) any deviations from this method. DIN EN ISO 10768:2010-12 EN ISO 10768:2010 (E) 8
