SIST EN ISO 9856:2017

Conveyor belts - Determination of elastic and permanent elongation and calculation of elastic modulus (ISO 9856:2016)

ISO 9856:2016 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.

Fördergurte - Bestimmung der elastischen und dauerhaften Dehnung und Berechnung des Elastizitätsmoduls (ISO 9856:2016)

Courroies transporteuses - Détermination de l'allongement élastique et permanent et calcul du module d'élasticité (ISO 9856:2016)

ISO 9856:2016 spécifie une méthode pour la détermination de l'allongement élastique et rémanent d'une courroie transporteuse et le calcul du module d'élasticité.
Elle n'est ni applicable ni appropriée pour les courroies transporteuses légères telles que décrites dans l'ISO 21183‑1.

Naprave za kontinuirni transport - Trakovi tračnih transporterjev - Določitev elastičnega in trajnega raztezka ter izračun modula elastičnosti (ISO 9856:2016)

Ta mednarodni standard določa metodo za določanje elastičnega in trajnega raztezka traka tračnega transporterja ter izračun modula elastičnosti.
Ne uporablja se oziroma ni veljaven za lahke trakove tračnih transporterjev, kot so opisani v standardu ISO 21183-1.

General Information

• Status: Published
• Public Enquiry End Date: 07-Aug-2016
• Publication Date: 19-Feb-2017
• ICS: 53.040.20 - Components for conveyors
• Technical Committee: DTN - Lift and transport appliances
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 02-Feb-2017
• Due Date: 09-Apr-2017
• Completion Date: 20-Feb-2017
• Mandate: M/BC/CEN/88/13 - Standardization request to CEN/CENELEC relating to machinery
• Ref Project: EN ISO 9856:2016 - Conveyor belts - Determination of elastic and permanent elongation and calculation of elastic modulus (ISO 9856:2016)

Relations

• Replaces: SIST EN ISO 9856:2004/A1:2012 - Conveyor belts - Determination of elastic and permanent elongation and calculation of elastic modulus (ISO 9856:2003/Amd 1:2012)
• Effective Date: 01-Mar-2017
• Replaces: SIST EN ISO 9856:2004 - Conveyor belts - Determination of elastic and permanent elongation and calculation of elastic modulus (ISO 9856:2003)
• Effective Date: 01-Mar-2017

Overview

EN ISO 9856:2016 (ISO 9856:2016) specifies a laboratory method for determining elastic and permanent elongation of conveyor belts and for calculating the belt elastic modulus. The procedure is intended for full‑thickness, longitudinal test pieces of conventional conveyor belts (not applicable to light conveyor belts covered by ISO 21183‑1). It defines sampling, specimen preparation, conditioning, test apparatus and a cyclic tensile test protocol that produces force‑elongation records for evaluation.

Key Topics and Requirements

• Scope: Measurement of permanent elongation (permanent stretch), elastic elongation (elastic stretch) and calculation of elastic modulus for conveyor belts.
• Test principle: A rectangular test piece is subjected to a sinusoidally varying tensile force between defined upper and lower reference forces for 200 cycles; elastic and permanent elongations are read from the force‑elongation graph.
• Specimen dimensions and preparation: Three longitudinal specimens (50 mm × ≥300 mm free length) are cut from full belt thickness; covers are trimmed to leave 0.5–1 mm cover thickness.
• Apparatus: Dynamic tensile testing machine with force measurement calibrated per ISO 7500‑1 (machine class 3 or better), extensometer (≥100 mm, 0.1 mm accuracy) and a recorder for force‑elongation graphs.
• Loading parameters: Initial preload (0.5% of nominal tensile strength × specimen width), sinusoidal loading at about 0.1 Hz between upper (10% of nominal tensile strength) and lower (2% of nominal tensile strength) reference forces.
• Results and calculations: Permanent elongation (%) and elastic elongation (%) calculated relative to reference length; elastic modulus expressed as ΔF divided by fractional elastic elongation (N/mm width). Arithmetic mean of three specimens is reported.
• Conditioning and sampling: Specimens conditioned per ISO 18573; samples selected according to ISO 282.

Applications and Users

• Who uses it: Conveyor belt manufacturers, independent testing laboratories, quality control teams, procurement/specification engineers, plant operators and consultants.
• Practical value:
  • Verifies belt dimensional stability after mechanical conditioning.
  • Supports supplier‑customer agreements on expected permanent stretch and elastic behavior.
  • Informs belt selection and installation tensioning to control tracking and load handling.
  • Used in conjunction with standards such as ISO 3870 and ISO 5293 for system design and performance assessment.

Related Standards

• ISO 21183‑1 (light conveyor belts) - exclusion noted
• ISO 282 - sampling of conveyor belts
• ISO 7500‑1 - calibration/verification of tensile machines
• ISO 18573 - test atmospheres and conditioning
• ISO 3870, ISO 5293 - application contexts referenced in ISO 9856

Keywords: EN ISO 9856:2016, conveyor belts, elastic elongation, permanent elongation, elastic modulus, tensile testing, extensometer, belt testing, ISO standard.

Standards Content (Sample)

SLOVENSKI STANDARD
01-marec-2017
1DGRPHãþD
SIST EN ISO 9856:2004
SIST EN ISO 9856:2004/A1:2012
1DSUDYH]DNRQWLQXLUQLWUDQVSRUW7UDNRYLWUDþQLKWUDQVSRUWHUMHY'RORþLWHY
HODVWLþQHJDLQWUDMQHJDUD]WH]NDWHUL]UDþXQPRGXODHODVWLþQRVWL,62
Conveyor belts - Determination of elastic and permanent elongation and calculation of
elastic modulus (ISO 9856:2016)
Fördergurte - Bestimmung der elastischen und dauerhaften Dehnung und Berechnung
des Elastizitätsmoduls (ISO 9856:2016)
Courroies transporteuses - Détermination de l'allongement élastique et permanent et
calcul du module d'élasticité (ISO 9856:2016)
Ta slovenski standard je istoveten z: EN ISO 9856:2016
ICS:
53.040.20 Deli za transporterje Components for conveyors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 9856
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2016
EUROPÄISCHE NORM
ICS 53.040.20 Supersedes EN ISO 9856:2003
English Version
Conveyor belts - Determination of elastic and permanent
elongation and calculation of elastic modulus (ISO
9856:2016)
Courroies transporteuses - Détermination de Fördergurte - Bestimmung der elastischen und
l'allongement élastique et rémanent et calcul du dauerhaften Dehnung und Berechnung des
module d'élasticité (ISO 9856:2016) Elastizitätsmoduls (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
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-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 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, Belgium, 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, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR 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 Ref. No. EN ISO 9856:2016 E
worldwide for CEN national Members.

Contents Page
European foreword . 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
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 possibility 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 standards 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, Luxembourg, 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.
INTERNATIONAL ISO
STANDARD 9856
Third edition
2016-10-15
Conveyor belts — Determination of
elastic and permanent elongation and
calculation of elastic modulus
Courroies transporteuses — Détermination de l’allongement élastique
et rémanent et calcul du module d’élasticité
Reference number
ISO 9856:2016(E)
©
ISO 2016
ISO 9856:2016(E)
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
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ii © ISO 2016 – All rights reserved

ISO 9856:2016(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 3
5 Apparatus . 3
6 Sampling . 3
7 Test pieces . 3
8 Conditioning . 3
9 Procedure. 3
10 Calculation and expression of results . 5
11 Test report . 5
Bibliography . 6
ISO 9856:2016(E)
Foreword
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 interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
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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 maintenance 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 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 paten
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