1、March 2017 English price group 9No 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).ICS 53.040.20!%bVf“2635167www.din.deDIN
2、 EN ISO 9856Conveyor belts Determination of elastic and permanent elongation and calculation of elastic modulus (ISO 9856:2016);English version EN ISO 9856:2016,English translation of DIN EN ISO 9856:2017-03Frdergurte Bestimmung der elastischen und dauerhaften Dehnung und Berechnung des Elastizittsm
3、oduls (ISO 9856:2016);Englische Fassung EN ISO 9856:2016,Englische bersetzung von DIN EN ISO 9856:2017-03Courroies transporteuses Dtermination de lallongement lastique et rmanent et calcul du module dlasticit (ISO 9856:2016);Version anglaise EN ISO 9856:2016,Traduction anglaise de DIN EN ISO 9856:20
4、17-03SupersedesDIN EN ISO 9856:201211www.beuth.deDocument comprises 13 pagesDTranslation by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.02.17 DIN EN ISO 9856:2017-03 2 A comma is used as the decimal marker. National foreword This document (EN I
5、SO 9856:2016) has been prepared by Technical Committee ISO/TC 41 “Pulleys and belts (including veebelts)” (Secretariat: SAC, China), SC 3 “Conveyor belts (Twin secretariat: SAC, China and JISC, Japan) and has been taken over as EN ISO 9856:2016 by Technical Committee CEN/TC 188 “Conveyor belts” (Sec
6、retariat: SNV, Switzerland). The responsible German body involved in its preparation was DIN-Normenausschuss Elastomer-Technik (DIN Standards Committee Elastomer Technology), Working Committee NA 045-02-05 AA Frdergurte. The DIN Standard corresponding to the International Standard referred to in thi
7、s document is as follows: ISO 7500-1 DIN EN ISO 7500-1 Amendments This standard differs from DIN EN ISO 9856:2012-11 as follows: a) the standard has been editorially and technically revised; b) the text of the introduction has been revised; c) the amendment A1:2012 has been incorporated; d) normativ
8、e references have been revised. Previous editions DIN 22109: 1973-02 DIN 22109-2: 1979-08 DIN 22109-6: 1988-02 DIN EN ISO 9856: 1995-11, 2004-07, 2012-11 National Annex NA (informative) Bibliography DIN EN ISO 7500-1, Metallic materials Calibration and verification of static uniaxial testing machine
9、s Part 1: Tension/compression testing machines Calibration and verification of the force-measuring system EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 9856 October 2016 ICS 53.040.20 Supersedes EN ISO 9856:2003English Version Conveyor belts - Determination of elastic and permanent elonga
10、tion and calculation of elastic modulus(ISO9856:2016) Courroies transporteuses - Dtermination de lallongement lastique et rmanent et calcul du module dlasticit (ISO 9856:2016) Frdergurte - Bestimmung der elastischen und dauerhaften Dehnung und Berechnung des Elastizittsmoduls (ISO 9856:2016) This Eu
11、ropean Standard was approved by CEN on 5 October 2016. 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
12、concerning such national standards may be obtained on application to the CEN-CENELEC 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 membe
13、r into its own language and notified to the CEN-CENELEC Management 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, Former Yugoslav Republic of Macedonia, Fran
14、ce, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KO
15、MITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2016 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 9856:2016 EForeword . 4Introduction .51 Scope . 62 Normative references 63 Terms and definit
16、ions . 64 Principle 85 Apparatus . 86 Sampling 87 Test pieces . 88 Conditioning 89 Procedure. 810 Calculation and expression of results 1011 Test report 10Bibliography .11Contents PageEN ISO 9856:2016 (E) DIN EN ISO 9856:2017-03 2European foreword .3European foreword This document (EN ISO 9856:2016)
17、 has been prepared by Technical Committee ISO/TC 41 “Pulleys and belts (including veebelts)” in collaboration with Technical CEN/TC 188 “Conveyor belts” the secretariat of which is held by SNV. This European Standard shall be given the status of a national standard, either by publication of an ident
18、ical text or by endorsement, at the latest by April 2017, and conflicting national standards shall be withdrawn at the latest by April 2017. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held resp
19、onsible for identifying any or all such patent rights. This document supersedes EN ISO 9856:2003. 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
20、rus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the Unite
21、d Kingdom. Endorsement notice The text of ISO 9856:2016 has been approved by CEN as EN ISO 9856:2016 without any modification. EN ISO 9856:2016 (E) DIN EN ISO 9856:2017-03 3 ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO m
22、ember bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governm
23、ental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenanc
24、e are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention
25、is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/
26、or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity ass
27、essment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.The committee responsible for this document is ISO/TC 41 Pulleys and belts (including veebelts), Subcomm
28、ittee SC 3, Conveyor belts.This third edition cancels and replaces the second edition (ISO 9856:2003), of which it constitutes a minor revision. It also incorporates the amendment ISO 9856:2003/Amd 1:2012. The normative references have been updated.EN ISO 9856:2016 (E) DIN EN ISO 9856:2017-03 4 Intr
29、oductionThis International Standard is used in a number of situations where the permanent elongation of the conveyor belt after mechanical conditioning is of some practical relevance and in particular in the implementation of ISO 3870 and the application of ISO 5293.EN ISO 9856:2016 (E) DIN EN ISO 9
30、856:2017-03 5 1 ScopeThis International Standard specifies a method for determining the elastic and permanent elongation of a conveyor belt and the calculation of the elastic modulus.It is not applicable or valid for light conveyor belts as described in ISO 21183-1.2 Normative referencesThe followin
31、g documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 282, Conveyor be
32、lts SamplingISO 7500-1, Metallic materials Calibration and verification of static uniaxial testing machines Part 1: Tension/compression testing machines Calibration and verification of the force-measuring systemISO 18573, Conveyor belts Test atmospheres and conditioning periods3 Terms and definition
33、sFor the purposes of this document, the following terms and definitions apply.3.1tensile strengthgreatest measured force during the tensile test divided by the width of the test pieceNote 1 to entry: It is expressed in newtons per millimetre.Note 2 to entry: See ISO 283 for tensile test.3.2nominal t
34、ensile strengthTspecified minimum value of the tensile strength (3.1)Note 1 to entry: It is expressed in newtons per millimetre.3.3upper reference forceFUforce equivalent to 10 % of T (3.2)Note 1 to entry: It is expressed in newtons per millimetre.3.4lower reference forceFLforce equivalent to 2 % of
35、 T (3.2)Note 1 to entry: It is expressed in newtons per millimetre.EN ISO 9856:2016 (E) DIN EN ISO 9856:2017-03 6 3.5specific force range factorFspecific force range applied during the test, i.e. the upper reference force (3.3) minus the lower reference force (3.4):FF F=ULNote 1 to entry: It is expr
36、essed in newtons per millimetre.3.6permanent elongationlpnon-recoverable change in length of the test piece after defined loading cyclesNote 1 to entry: It is expressed in millimetres.3.7elastic elongationlerecoverable change in length of the test piece after defined loading cyclesNote 1 to entry: I
37、t is expressed in millimetres.Note 2 to entry: The recovery from extension may be instantaneous or time-dependent, or a combination of both.3.8reference lengthlOinitial length of the test pieceNote 1 to entry: It is expressed in millimetres.3.9permanent strainpermpermanent elongation, lp, (3.6) expr
38、essed as a percentage of the reference length, lO(3.8)Note 1 to entry: This term is often referred to as “permanent stretch” in conveyor belt technology.3.10elastic strainelastelastic elongation, le, (3.7) expressed as a percentage of the reference length, lO(3.8)Note 1 to entry: This term is often
39、referred to as “elastic stretch” in conveyor belt technology.3.11elastic modulusMF (3.5) divided by the fractional elastic elongation (3.7) at the end of the specified number of cyclesNote 1 to entry: It is expressed in newtons per millimetre.Note 2 to entry: This definition of the term deviates fro
40、m that normally used in engineering, in which the modulus is expressed in units of stress (i.e. a force per unit of cross-section) and is represented by the symbol E.EN ISO 9856:2016 (E) DIN EN ISO 9856:2017-03 7 4 PrincipleA test piece, cut from the full thickness of the conveyor belt in the longit
41、udinal direction, is subjected to a force that varies sinusoidally between defined limits. After 200 cycles, the amount of permanent elongation of the test piece and the amount of elastic elongation produced by the force differential are recorded from a force-elongation graph.The special application
42、 conveyor belts may be used with higher elongation in the tensile member. For these belts, the permanent elongation measured according to the stated test procedure does not allow a conclusion regarding the permanent elongation of the belt in real-life operation. A higher number of load cycles (joint
43、ly agreed upon by the supplier and the customer) can be of help.5 Apparatus5.1 Dynamic tensile testing machine, of appropriate capacity to enable up to at least of the nominal tensile breaking load of the conveyor belt to be applied and with a force measuring system in accordance with ISO 7500-1, cl
44、ass of machine 3 or better (e.g. class 2).5.2 Extensometer, with a measuring length of at least 100 mm and accurate to 0,1 mm or more.5.3 Recording device, to record the graph of the applied tensile stress as a function of actual elongation.6 SamplingSelect a sample of conveyor belt in accordance wi
45、th ISO 282 of sufficient size to enable all three test pieces described in 7.1 to be obtained. One test piece shall be taken from each edge of the belt and one test piece shall be taken from the middle of the belt. The sample shall be taken at least five days after manufacture.7 Test pieces7.1 Numbe
46、r, shape and dimensionsCut three rectangular test pieces, each 50 mm wide at least 300 mm long (plus the necessary clamping length at each end of the test piece) in the longitudinal direction from the full thickness of the conveyor belt.7.2 PreparationRemove the covers from each test piece so that t
47、he thickness of the remaining cover is between 0,5 mm and 1 mm.8 ConditioningCondition the test pieces in accordance with ISO 18573.9 ProcedurePlace the ends of the test piece between the jaws or clamps of the tensile testing machine (5.1) so that it is held securely and the free length between the faces of the jaws is at least 300 mm.Apply an initial force to the test piece equal to 0,5 % of the nominal tensile strength, T, multiplied by the test piece width in millimetres.EN ISO 9856:2016 (E) DIN EN ISO 9856:2017-03 8 Position the two grids of the extensometer (5.2) on th
