SIST EN ISO 899-2:2024

Plastics - Determination of creep behaviour - Part 2: Flexural creep by three-point loading (ISO 899-2:2024)

ISO 899-2:2003 specifies a method for determining the flexural creep of plastics in the form of standard test specimens under specified conditions such as those of pretreatment, temperature and humidity. It applies only to a simple freely supported beam loaded at mid-span (three-point-loading test).
The method is suitable for use with rigid and semi-rigid non-reinforced, filled and fibre-reinforced plastics materials (see ISO 472 for definitions) in the form of dumb-bell-shaped test specimens moulded directly or machined from sheets or moulded articles.
NOTE The method may be unsuitable for certain fibre-reinforced materials due to differences in fibre orientation.
The method is intended to provide data for engineering-design and research and development purposes. Data for engineering-design purposes requires the use of extensometers to measure the gauge length of the specimen. Data for research or quality-control purposes may use the change in distance between the grips (nominal extension).
Flexural creep may vary significantly with differences in specimen preparation and dimensions and in the test environment. The thermal history of the test specimen can also have profound effects on its creep behaviour (see Annex A). Consequently, when precise comparative results are required, these factors must be carefully controlled.
If flexural-creep properties are to be used for engineering-design purposes, the plastics materials should be tested over a broad range of stresses, times and environmental conditions.
The method may not be suitable for determining the flexural creep of rigid cellular plastics (attention is drawn in this respect to ISO 1209-1, Cellular plastics, rigid -- Flexural tests -- Part 1: Bending test, and ISO 1209-2, Cellular plastics, rigid -- Flexural tests -- Part 2: Determination of flexural properties).

Kunststoffe - Bestimmung des Kriechverhaltens - Teil 2: Zeitstand-Biegeversuch bei Dreipunkt-Belastung (ISO 899-2:2024)

1.1   Dieses Dokument legt ein Verfahren zur Bestimmung des Biege-Kriech-Verhaltens von Kunststoffen in Form von genormten Probekörpern unter festgelegten Bedingungen z. B. von Vorbehandlung, Temperatur und Feuchte fest. Es ist nur auf einen einfachen, frei aufgelegten Biegebalken anwendbar, der in der Mitte belastet ist (Dreipunkt-Biegeversuch).
1.2   Das Verfahren ist geeignet für die Anwendung auf Probekörper aus steifen und halbsteifen unverstärkten, gefüllten und faserverstärkten Kunststoff-Formmassen (Definitionen siehe ISO 472), die entweder direkt gespritzt oder spanend aus Platten oder gespritzten Fertigteilen entnommen wurden.
ANMERKUNG   Das Verfahren kann für bestimmte faserverstärkte Kunststoffe wegen Unterschieden in der Faserorientierung ungeeignet sein.
1.3   Das Verfahren soll Daten für konstruktive Zwecke, Qualitätskontrolle, Forschung und Entwicklung liefern.
1.4   Das Verfahren ist möglicherweise nicht anwendbar für die Bestimmung des Biege-Kriech-Verhaltens von harten Schaumstoffen (in diesem Zusammenhang wird auf ISO 1209 1 und ISO 1209 2 verwiesen).

Plastiques - Détermination du comportement au fluage - Partie 2: Fluage en flexion par mise en charge en trois points (ISO 899-2:2024)

L'ISO 899-2:2003 décrit une méthode de détermination du fluage en flexion des plastiques sous forme d'éprouvettes normalisées dans des conditions spécifiées, telles qu'en matière de traitement préalable, de température et d'humidité. Cette méthode s'applique uniquement aux poutres simples, supportées sans contrainte et chargées au milieu de leur portée (méthode des trois pannes).
Cette méthode est destinée aux plastiques rigides et semi-rigides, non renforcés, chargés et renforcés par des fibres (voir ISO 472 pour les définitions) sous forme de barreaux rectangulaires moulés directement ou prélevés sur des feuilles ou des objets moulés.
NOTE Cette méthode peut s'avérer inappropriée dans le cas de certaines matières renforcées par des fibres en raison des différences d'orientation de celles-ci.
Cette méthode est proposée pour fournir des données utiles pour la conception en ingénierie, la recherche et le développement. Les données utiles pour la conception en ingénierie nécessitent l'emploi de l'extensométrie basée sur la longueur de référence de l'éprouvette. Les données pour la recherche ou le contrôle peuvent utiliser la méthode de fluage en traction nominale.
Le fluage en flexion peut dépendre étroitement des différences existant en matière de dimensions et de préparation des éprouvettes ainsi qu'en ce qui concerne l'environnement d'essai. L'histoire thermique de l'éprouvette peut également influencer profondément son comportement au fluage (voir Annexe A). En conséquence, lorsque des résultats comparatifs précis sont requis, ces facteurs doivent être contrôlés avec soin.
Si les caractéristiques de fluage en flexion sont destinées à des fins de conception en ingénierie, il convient de soumettre à l'essai les matériaux plastiques dans une large gamme de contraintes, de durées et d'environnements.
Cette méthode peut s'avérer inappropriée pour déterminer le fluage en flexion des plastiques alvéolaires rigides (à cet égard, l'attention est attirée sur l'ISO 1209-1, Plastiques alvéolaires rigides -- Essais de flexion -- Partie 1: Essai de flexion, et l'ISO 1209-2, Plastiques alvéolaires rigides -- Essais de flexion -- Partie 2: Détermination des propriétés de flexion).

Polimerni materiali - Ugotavljanje lezenja - 2. del: Lezenje pri tritočkovni obremenitvi (ISO 899-2:2024)

General Information

• Status: Published
• Public Enquiry End Date: 01-May-2023
• Publication Date: 06-Nov-2024
• ICS: 83.080.01 - Plastics in general
• Technical Committee: IPMA - Polimer materials and products
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 04-Nov-2024
• Due Date: 09-Jan-2025
• Completion Date: 07-Nov-2024
• Ref Project: EN ISO 899-2:2024 - Plastics - Determination of creep behaviour - Part 2: Flexural creep by three-point loading (ISO 899-2:2024)

Relations

• Replaces: SIST EN ISO 899-2:2003/A1:2015 - Plastics - Determination of creep behaviour - Part 2: Flexural creep by three-point loading - Amendment 1 (ISO 899-2:2003/Amd 1:2015)
• Effective Date: 18-Jan-2023
• Revised: SIST EN ISO 899-2:2003 - Plastics - Determination of creep behaviour - Part 2: Flexural creep by three-point loading (ISO 899-2:2003)
• Effective Date: 19-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2024
Nadomešča:
SIST EN ISO 899-2:2003/A1:2015
Polimerni materiali - Ugotavljanje lezenja - 2. del: Lezenje pri tritočkovni
obremenitvi (ISO 899-2:2024)
Plastics - Determination of creep behaviour - Part 2: Flexural creep by three-point
loading (ISO 899-2:2024)
Kunststoffe - Bestimmung des Kriechverhaltens - Teil 2: Zeitstand-Biegeversuch bei
Dreipunkt-Belastung (ISO 899-2:2024)
Plastiques - Détermination du comportement au fluage - Partie 2: Fluage en flexion par
mise en charge en trois points (ISO 899-2:2024)
Ta slovenski standard je istoveten z: EN ISO 899-2:2024
ICS:
83.080.01 Polimerni materiali na Plastics in general
splošno
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 899-2
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2024
EUROPÄISCHE NORM
ICS 83.080.01 Supersedes EN ISO 899-2:2003, EN ISO 899-
2:2003/A1:2015
English Version
Plastics - Determination of creep behaviour - Part 2:
Flexural creep by three-point loading (ISO 899-2:2024)
Plastiques - Détermination du comportement au fluage Kunststoffe - Bestimmung des Kriechverhaltens - Teil
- Partie 2: Fluage en flexion par mise en charge en trois 2: Zeitstand-Biegeversuch bei Dreipunkt-Belastung
points (ISO 899-2:2024) (ISO 899-2:2024)
This European Standard was approved by CEN on 18 October 2024.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 899-2:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 899-2:2024) has been prepared by Technical Committee ISO/TC 61 "Plastics" in
collaboration with Technical Committee CEN/TC 249 “Plastics” the secretariat of which is held by SIS.
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 2025, and conflicting national standards shall be
withdrawn at the latest by April 2025.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 899-2:2003.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
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, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 899-2:2024 has been approved by CEN as EN ISO 899-2:2024 without any modification.

International
Standard
ISO 899-2
Third edition
Plastics — Determination of creep
2024-10
behaviour —
Part 2:
Flexural creep by three-point loading
Plastiques — Détermination du comportement au fluage —
Partie 2: Fluage en flexion par mise en charge en trois points
Reference number
ISO 899-2:2024(en) © ISO 2024
ISO 899-2:2024(en)
© ISO 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 899-2:2024(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Apparatus . 3
5 Test specimens . 4
5.1 Shape and dimensions .4
5.2 Preferred specimen type .4
5.3 Other test specimens .5
6 Procedure . 5
6.1 General .5
6.2 Conditioning and test atmosphere.5
6.3 Measurement of test-specimen dimensions and distance between supports .5
6.4 Mounting the test specimens .6
6.5 Selection of stress value .6
6.6 Loading procedure .6
6.6.1 Preloading .6
6.6.2 Loading .6
6.7 Deflection-measurement schedule .6
6.8 Time measurement .7
6.9 Temperature and humidity control .7
6.10 Measurement of recovery rate (optional) .7
7 Expression of results . 7
7.1 Method of calculation .7
7.1.1 Flexural-creep modulus .7
7.1.2 Flexural-creep compliance .7
7.1.3 Flexural stress .8
7.1.4 Flexural-creep strain .8
7.1.5 Time to rupture .8
7.1.6 Creep-strength limit .8
7.2 Presentation of results .9
7.2.1 Creep curves.9
7.2.2 Creep-modulus/time curves .9
7.2.3 lsochronous stress-strain curves .10
7.2.4 Three-dimensional representation .10
7.2.5 Creep-to-rupture curves .10
7.3 Precision . . .11
8 Test report .11
Annex A (informative) Physical-ageing effects on the creep of polymers .12
Bibliography .16

iii
ISO 899-2:2024(en)
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 b
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