prEN ISO 899-2
(Main)Plastics - Determination of creep behaviour - Part 2: Flexural creep by three-point loading (ISO/DIS 899-2:2023)
Plastics - Determination of creep behaviour - Part 2: Flexural creep by three-point loading (ISO/DIS 899-2:2023)
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/DIS 899‑2:2023)
Plastiques - Détermination du comportement au fluage - Partie 2: Fluage en flexion par mise en charge en trois points (ISO/DIS 899-2:2023)
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/DIS 899-2:2023)
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-april-2023
Nadomešča:
SIST EN ISO 899-2:2003/A1:2015
Polimerni materiali - Ugotavljanje lezenja - 2. del: Lezenje pri tritočkovni
obremenitvi (ISO/DIS 899-2:2023)
Plastics - Determination of creep behaviour - Part 2: Flexural creep by three-point
loading (ISO/DIS 899-2:2023)
Kunststoffe - Bestimmung des Kriechverhaltens - Teil 2: Zeitstand-Biegeversuch bei
Dreipunkt-Belastung (ISO/DIS 899‑2:2023)
Plastiques - Détermination du comportement au fluage - Partie 2: Fluage en flexion par
mise en charge en trois points (ISO/DIS 899-2:2023)
Ta slovenski standard je istoveten z: prEN ISO 899-2
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.
DRAFT INTERNATIONAL STANDARD
ISO/DIS 899-2
ISO/TC 61/SC 2 Secretariat: SAC
Voting begins on: Voting terminates on:
2023-02-08 2023-05-03
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
ICS: 83.080.01
IMPORTANT — Please use this updated version dated 2023-01-13, and discard any
previous version of this DIS. The link to figure 4 has been corrected.
This document is circulated as received from the committee secretariat.
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ISO/DIS 899-2:2023(E)
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ISO/DIS 899-2:2023(E)
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ii
ISO/DIS 899-2:2023(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Apparatus . 3
5 Test specimens . 5
6 Procedure .5
6.1 Conditioning and test atmosphere. 5
6.2 Measurement of test-specimen dimensions and distance between supports . 5
6.3 Mounting the test specimens . 5
6.4 Selection of stress value . 6
6.5 Loading procedure . 6
6.5.1 Preloading . 6
6.5.2 Loading . 6
6.6 Deflection-measurement schedule . 6
6.7 Time measurement . 6
6.8 Temperature and humidity control . 6
6.9 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 . 7
7.1.4 Flexural-creep strain . 8
7.2 Presentation of results . 8
7.2.1 Creep curves. 8
7.2.2 Creep-modulus/time curves . 8
7.2.3 lsochronous stress-strain curves . 9
7.2.4 Three-dimensional representation . 10
7.2.5 Creep-to-rupture curves . 10
7.3 Precision . . . 10
8 Test report .10
Annex A (informative) Physical-ageing effects on the creep of polymers .12
Bibliography .16
iii
ISO/DIS 899-2:2023(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 third edition cancels and replaces the second edition (ISO 899-2:2015), 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
The main changes are as follows:
— the accuracy requirements for the deflection measurement device were updated
— the text of ISO 899-2:2003/AMD 1:2015 has replaced the existing text in the Annex A.2
— the normative references were updated
— the definition of creep was adapted for more clearness
A list of all parts in the ISO 899 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
DRAFT INTERNATIONAL STANDARD ISO/DIS 899-2:2023(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 pre-treatment, 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) 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, research and development
purposes. Data for engineering-design purposes requires the use of a deflectometer to measure the
deflection of the specimen.
1.4 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 documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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, Plastics — Determination of water absorption
ISO 178, Plastics — Determination of flexural properties
ISO 291, Plastics — Standard atmospheres for conditioning and testing
ISO 293, Plastics — Compression moulding of test specimens of thermoplastic materials
ISO 294-1, Plastics — Injection moulding of test specimens of thermoplastic materials — Part 1: General
principles, and moulding of multipurpose and bar test specimens
ISO 295, Plastics — Compression moulding of test specimens of thermosetting materials
ISO 2602, Statistical interpretation of test results — Estimation of the mean — Confidence interval
ISO 2818, Plastics — Preparation of test specimens by machining
ISO 472, Plastics — Vocabulary
ISO/DIS 899-2:2023(E)
ISO 9513, Metallic materials — Calibration of extensometer systems used in uniaxial testing
ISO 10724-1, Plastics — Injection moulding of test specimens of ther
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