SIST EN ISO 899-2:2003

Plastics - Determination of creep behaviour - Part 2: Flexural creep by three-point loading (ISO 899-2:2003)

1.1 This part of ISO 899 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).
1.2 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.
1.3 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).
1.4 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.
1.5 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.
1.6 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).
2

Kunststoffe - Bestimmung des Kriechverhaltens - Teil 2: Zeitstand-Biegeversuch bei Dreipunkt-Belastung (ISO 899-2:2003)

1.1   Dieser Teil von ISO 899 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. Dieser Teil bezieht sich nur auf einen einfachen, frei aufgelegten Biegebalken, der in der Mitte belastet ist (Dreipunkt-Biegeversuch).
1.2   Das Verfahren ist geeignet für die Anwendung auf steife und halbsteife unverstärkte, gefüllte und faser-verstärkte Kunststoff-Formmassen (Definitionen siehe ISO 472) in Form von stabförmigen, rechtwinkligen Probe-körpern, 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 liefert Daten für konstruktive Zwecke sowie für Forschung und Entwicklung. Daten zur Verwendung in der Dimensionierung von Bauteilen erfordern den Gebrauch von Extensometern zur genauen Bestimmung der Dehnung. Daten für Forschungs- oder Qualitätssicherungszwecke können unter Verwendung der Änderung des Klemmen- bzw. Traversenweges (nominelle Dehnung) bestimmt werden.
1.4   Das Biege-Kriech-Verhalten kann in starkem Maße von der Herstellung und den Maßen des Probekörpers abhängen sowie von den Umgebungsbedingungen beim Versuch. Die thermische Vorbehandlung des Probe-körpers kann ebenfalls einen ausgeprägten Effekt auf sein Kriechverhalten haben (siehe Anhang A). Daraus folgt, dass bei genauen Vergleichsmessungen diese Einflussfaktoren sorgfältig beachtet werden müssen.
1.5   Wenn Eigenschaften aus dem Zeitstand-Biegeversuch für konstruktive Zwecke verwendet werden sollen, sollten die Kunststoffe über einen breiten Bereich von Spannungen, Zeiten und Umgebungs-bedingungen geprüft werden.

Plastiques - Détermination du comportement au fluage - Partie 2: Fluage en flexion par mise en charge en trois points (ISO 899-2:2003)

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 899-2:2003)

General Information

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 83.080.01 - Plastics in general
• Technical Committee: IPMA - Polimer materials and products
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2003
• Due Date: 01-Dec-2003
• Completion Date: 01-Dec-2003
• Ref Project: EN ISO 899-2:2003 - Plastics - Determination of creep behaviour - Part 2: Flexural creep by three-point loading (ISO 899-2:2003)

Relations

• Replaces: SIST EN ISO 899-2:1999 - Plastics - Determination of creep behaviour - Part 2: Flexural creep by three-point loading (ISO 899-2:1993)
• Effective Date: 01-Dec-2003
• Amended By: 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: 01-Jun-2015
• Revises: oSIST prEN ISO 899-2 rev:2023 - Plastics - Determination of creep behaviour - Part 2: Flexural creep by three-point loading (ISO/DIS 899-2:2023)
• Effective Date: 19-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 899-2:2003
01-december-2003
1DGRPHãþD
SIST EN ISO 899-2:1999
3ROLPHUQLPDWHULDOL±8JRWDYOMDQMHOH]HQMD±GHO/H]HQMHSULWULWRþNRYQL
REUHPHQLWYL,62
Plastics - Determination of creep behaviour - Part 2: Flexural creep by three-point
loading (ISO 899-2:2003)
Kunststoffe - Bestimmung des Kriechverhaltens - Teil 2: Zeitstand-Biegeversuch bei
Dreipunkt-Belastung (ISO 899-2:2003)
Plastiques - Détermination du comportement au fluage - Partie 2: Fluage en flexion par
mise en charge en trois points (ISO 899-2:2003)
Ta slovenski standard je istoveten z: EN ISO 899-2:2003
ICS:
83.080.01 Polimerni materiali na Plastics in general
splošno
SIST EN ISO 899-2:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 899-2:2003

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SIST EN ISO 899-2:2003
EUROPEAN STANDARD
EN ISO 899-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2003
ICS 83.080.01 Supersedes EN ISO 899-2:1996
English version
Plastics - Determination of creep behaviour - Part 2: Flexural
creep by three-point loading (ISO 899-2:2003)
Plastiques - Détermination du comportement au fluage - Kunststoffe - Bestimmung des Kriechverhaltens - Teil 2:
Partie 2: Fluage en flexion par mise en charge en trois Zeitstand-Biegeversuch bei Dreipunkt-Belastung (ISO 899-
points (ISO 899-2:2003) 2:2003)
This European Standard was approved by CEN on 23 May 2003.
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 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 Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2003 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 899-2:2003 E
worldwide for CEN national Members.

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SIST EN ISO 899-2:2003
EN ISO 899-2:2003 (E)
CORRECTED  2003-07-16
Foreword
This document (EN ISO 899-2:2003) 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 IBN.
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 December 2003, and conflicting national
standards shall be withdrawn at the latest by December 2003.
This document supersedes EN ISO 899-2:1996.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium, Czech
Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and
the United Kingdom.
Endorsement notice
The text of ISO 899-2:2003 has been approved by CEN as EN ISO 899-2:2003 without any
modifications.
NOTE Normative references to International Standards are listed in Annex ZA (normative).
2

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SIST EN ISO 899-2:2003
EN ISO 899-2:2003 (E)
Annex ZA
(normative)
Normative references to international publications
with their relevant European publications
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of
any of these publications apply to this European Standard only when incorporated in it by
amendment or revision. For undated references the latest edition of the publication referred to
applies (including amendments).
NOTE Where an International Publication has been modified by common modifications, indicated
by (mod.), the relevant EN/HD applies.
Publication Year Title EN Year
ISO 62 1999 Plastics — Determination of water EN ISO 62 1999
absorption
ISO 178 2001 Plastics - Determination of flexural EN ISO 178 2003
properties
ISO 291 1997 Plastics — Standard atmospheres for EN ISO 291 1997
conditioning and testing
ISO 472 1999 Plastics — Vocabulary EN ISO 472 2001
3

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SIST EN ISO 899-2:2003

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SIST EN ISO 899-2:2003


INTERNATIONAL ISO
STANDARD 899-2
Second edition
2003-06-01


Plastics — Determination of creep
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 899-2:2003(E)
©
ISO 2003

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SIST EN ISO 899-2:2003
ISO 899-2:2003(E)
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©  ISO 2003
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
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ii © ISO 2003 — All rights reserved

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SIST EN ISO 899-2:2003
ISO 899-2:2003(E)
Contents Page
Foreword. iv
1 Scope. 1
2 Normative references. 1
3 Terms and definitions. 2
4 Apparatus. 3
5 Test specimens. 4
6 Procedure. 4
7 Expression of results. 6
8 Test report. 9
Annex A (informative) Physical-ageing effects on the creep of polymers . 10
Bibliography . 14

© ISO 2003 — All rights reserved iii

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SIST EN ISO 899-2:2003
ISO 899-2:2003(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 organizations, governmental 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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 899-2 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 2, Mechanical
properties.
This second edition cancels and replaces the first edition (ISO 899-2:1993), which has been technically
revised.
ISO 899 consists of the following parts, under the general title Plastics — Determination of creep behaviour :
 Part 1: Tensile creep
 Part 2: Flexural creep by three-point loading

iv © ISO 2003 — All rights reserved

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SIST EN ISO 899-2:2003
INTERNATIONAL STANDARD ISO 899-2:2003(E)

Plastics — Determination of creep behaviour —
Part 2:
Flexural creep by three-point loading
1 Scope
1.1 This part of ISO 899 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).
1.2 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.
1.3 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).
1.4 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.
1.5 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.
1.6 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).
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 latest edition of the referenced
document (including any amendments) applies.
ISO 62:1999, Plastics — Determination of water absorption
ISO 178:2001, Plastics — Determination of flexural properties
ISO 291:1997, Plastics — Standard atmospheres for conditioning and testing
ISO 472:1999, Plastics — Vocabulary
© ISO 2003 — All rights reserved 1

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SIST EN ISO 899-2:2003
ISO 899-2:2003(E)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 472 and the following apply.
3.1
creep
increase in strain with time when a constant force is applied
3.2
flexural stress
σ
surface stress in the mid-span section of the test specimen
NOTE It is calculated from the relationship given in 7.1.2.
3.3
deflection
s
t
distance over which the top or bottom surface of the test specimen at mid-span deviates from its original
position during flexure
NOTE It is expressed in millimetres.
3.4
flexural-creep strain
ε
t
strain at the surface of the test specimen produced by a stress at any given time t during a creep test,
calculated in accordance with 7.1.3
NOTE It is expressed as a dimensionless ratio or as a percentage.
3.5
flexural-creep modulus
E
t
ratio of flexural stress to flexural-creep strain, calculated as in 7.1.1
3.6
isochronous stress-strain curve
Cartesian plot of stress versus creep strain, at a specific time after application of the test load
3.7
time to rupture
period of time the specimen is under full load until rupture
3.8
creep-strength limit
initial stress which will just cause rupture (σ ) or will produce a specified strain (σ ) at a specified time t, at a
ε,t
B,t
given temperature and relative humidity
3.9
initial distance between specimen supports
span
L
initial distance between lines of contact between test specimen and supports (see Figure 1)
2 © ISO 2003 — All rights reserved

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SIST EN ISO 899-2:2003
ISO 899-2:2003(E)
4 Apparatus
4.1 Test rack, comprising a rigid frame with two supports, one for each end of the test specimen, the
distance between the supports being adjustable to (16 ± 1) times the thickness (height) of the specimen (see
Figure 1) for normal specimens, or to greater than 17 times the thickness (height) of the specimen or a fixed
distance (100 mm) for rigid unidirectional-fibre-reinforced test specimens (see 6.2). The test rack shall be
levelled, and sufficient space shall be allowed below the specimen for the specimen to flex under constant
loading at mid-span.

Key
1 applied force, F
2 loading edge
3 test specimen
4 support
Figure 1 — Characteristics of flexural-creep apparatus
The radius R of the loading edge and the radius R of the supports shall conform to the values given in
1 2
Table 1.
Table 1
Values in millimetres
Radius of loading edge Radius of supports
Thickness of test
specimen
R R
1 2
u 3 5 ± 0,1 2 ± 0,2
> 3 5 ± 0,1 5 ± 0,2

4.2 Loading system, capable of ensuring that the load is applied smoothly, without causing transient
overloading, and that the load is maintained to within ± 1 % of the desired load. In creep-to-rupture tests,
provision shall be made to prevent any shoc
...