1、BS EN ISO 9856:2016Conveyor belts Determination of elastic andpermanent elongation andcalculation of elastic modulus(ISO 9856:2016)BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS EN ISO 9856:2016 BRITISH STANDARDNational forewordThis British Standard is the UK imp
2、lementation of EN ISO 9856:2016. It supersedes BS EN ISO 9856:2003+A1:2012 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PRI/67, Conveyor belts.A list of organizations represented on this committee can be obtained on request to its secretary.This pub
3、lication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 92665 5 ICS 53.040.20 Compliance with a British Standard cannot confer immu
4、nity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2016.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 9856 October 2016
5、ICS 53.040.20 Supersedes EN ISO 9856:2003English Version Conveyor belts - Determination of elastic and permanent elongation and calculation of elastic modulus (ISO 9856:2016) Courroies transporteuses - Dtermination de lallongement lastique et rmanent et calcul du module dlasticit (ISO 9856:2016) Frd
6、ergurte - Bestimmung der elastischen und dauerhaften Dehnung und Berechnung des Elastizittsmoduls (ISO 9856:2016) This European 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 Eur
7、opean 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-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versio
8、ns (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-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, B
9、elgium, Bulgaria, Croatia, Cyprus, 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, Swi
10、tzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE 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 natio
11、nal Members. Ref. No. EN ISO 9856:2016 EBS EN ISO 9856:2016EN ISO 9856:2016 (E) 3 European foreword This document (EN ISO 9856:2016) 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
12、 of which is held by SNV. This 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 April 2017, and conflicting national standards shall be withdrawn at the latest by April 2017. Attention is drawn to the p
13、ossibility that some of the 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. This document supersedes EN ISO 9856:2003. According to the CEN-CENELEC Internal Regulations, the national standa
14、rds organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Lux
15、embourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 9856:2016 has been approved by CEN as EN ISO 9856:2016 without any modification. BS EN ISO 9856:2016ISO 9856:2016(E)Forewo
16、rd ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Principle 35 Apparatus . 36 Sampling 37 Test pieces . 38 Conditioning 39 Procedure. 310 Calculation and expression of results . 511 Test report . 5Bibliography 6 ISO 2016 All rights reserved iiiContents PageBS EN ISO
17、9856:2016ISO 9856:2016(E)ForewordISO (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 interested in
18、 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 Electrotechnical Commiss
19、ion (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents shou
20、ld 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 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 ide
21、ntifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/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 conven
22、ience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see th
23、e following URL: www.iso.org/iso/foreword.html.The committee responsible for this document is ISO/TC 41 Pulleys and belts (including veebelts), Subcommittee SC 3, Conveyor belts.This third edition cancels and replaces the second edition (ISO 9856:2003), of which it constitutes a minor revision. It a
24、lso incorporates the amendment ISO 9856:2003/Amd 1:2012. The normative references have been updated.iv ISO 2016 All rights reservedBS EN ISO 9856:2016ISO 9856:2016(E)IntroductionThis International Standard is used in a number of situations where the permanent elongation of the conveyor belt after me
25、chanical conditioning is of some practical relevance and in particular in the implementation of ISO 3870 and the application of ISO 5293. ISO 2016 All rights reserved vBS EN ISO 9856:2016BS EN ISO 9856:2016Conveyor belts Determination of elastic and permanent elongation and calculation of elastic mo
26、dulus1 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 following documen
27、ts, 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 belts Sampl
28、ingISO 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 definitionsFor the
29、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 tensile st
30、rengthTspecified 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 T (3.2)N
31、ote 1 to entry: It is expressed in newtons per millimetre.INTERNATIONAL STANDARD ISO 9856:2016(E) ISO 2016 All rights reserved 1BS EN ISO 9856:2016ISO 9856:2016(E)3.5specific force range factorFspecific force range applied during the test, i.e. the upper reference force (3.3) minus the lower referen
32、ce force (3.4):FF F=ULNote 1 to entry: It is expressed 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 pie
33、ce after defined loading cyclesNote 1 to entry: It 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.3.9permane
34、nt strainpermpermanent elongation, lp, (3.6) expressed 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 le
35、ngth, lO(3.8)Note 1 to entry: This term is often 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 t
36、o entry: This definition of the term deviates from 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.2 ISO 2016 All rights reservedBS EN ISO 9856:2016ISO 9856:2016(E)4 PrincipleA test pi
37、ece, cut from the full thickness of the conveyor belt in the longitudinal 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
38、 are recorded from a force-elongation graph.The special application 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
39、 belt in real-life operation. A higher number of load cycles (jointly 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
40、and with a force measuring system in accordance with ISO 7500-1, class 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 elo
41、ngation.6 SamplingSelect a sample of conveyor belt in accordance with 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 b
42、e taken at least five days after manufacture.7 Test pieces7.1 Number, 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 b
43、elt.7.2 PreparationRemove the covers from each test piece so that the 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
44、 (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. ISO 2016 All rights reserved 3BS EN ISO 9856:2016ISO
45、9856:2016(E)Position the two grids of the extensometer (5.2) on the axis of the test piece with a known reference length of at least 100 mm.Set the graphical recorder (5.3) to zero elongation.Apply force to the test piece approximately sinusoidally and at a frequency of 0,1 Hz between the upper and
46、lower reference forces as defined in 3.3 and 3.4.Record graphically at least the first and the 200th cycles (see Figure 1).From the graph obtained (see Figure 1), record the value of F of test piece width, in newtons per millimetre, and the value of leand lpat the 200th cycle.Key1 200th cycle2 initi
47、al forceX actual elongationY force applied, N/mmFigure 1 Variation in extension of a test piece in relation to cyclic applications of a load4 ISO 2016 All rights reservedBS EN ISO 9856:2016ISO 9856:2016(E)10 Calculation and expression of results10.1 Calculate the percentage permanent elongation, per
48、m, of the belt in accordance with Formula (1):permpo=ll100 (1)10.2 Calculate the percentage elastic elongation, elast, of the belt in accordance with Formula (2):elasteo=ll100 (2)10.3 Calculate the elastic modulus, M, of the belt in accordance with Formula (3) or Formula (4) and express the results
49、in newtons per millimetre width of belt, or multiples thereof:MF=elast100 (3)orMFll=oe(4)10.4 Calculate the arithmetic mean of the three results so obtained for each of the values in 10.1, 10.2 and 10.3, rounding the value to the first decimal place.11 Test reportThe test report shall contain the following information:a) identification of the belt tested;b) a reference to this International Standard, i.e. ISO 9856;c) the results of the test: the individual values and the arithmetic mean values;d) the
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