EN ISO 178:2010
(Main)Plastics - Determination of flexural properties (ISO 178:2010)
Plastics - Determination of flexural properties (ISO 178:2010)
ISO 178:2010 specifies a method for determining the flexural properties of rigid and semi-rigid plastics under defined conditions. A standard test specimen is defined, but parameters are included for alternative specimen sizes for use where appropriate. A range of test speeds is included.
The method is used to investigate the flexural behaviour of the test specimens and to determine the flexural strength, flexural modulus and other aspects of the flexural stress/strain relationship under the conditions defined. It applies to a freely supported beam, loaded at midspan (three-point loading test).
The method is suitable for use with the following range of materials:
thermoplastic moulding, extrusion and casting materials, including filled and reinforced compounds in addition to unfilled types; rigid thermoplastics sheets;
thermosetting moulding materials, including filled and reinforced compounds; thermosetting sheets.
ISO 178:2010 applies to fibre-reinforced compounds with fibre lengths less than or equal to 7,5 mm prior to processing. For long-fibre-reinforced materials (laminates) with fibre lengths greater than 7,5 mm, see ISO 14125.
The method is not normally suitable for use with rigid cellular materials or sandwich structures containing cellular material. In such cases, ISO 1209‑1 and/or ISO 1209‑2 can be used.
Contrary to the previous editions of this International Standard, this edition specifies two methods, method A and method B. Method A is identical to the method in previous editions of this International Standard, i.e. it uses a strain rate of 1 %/min throughout the test. Method B uses two different strain rates: 1 %/min for the determination of the flexural modulus and 5 %/min or 50 %/min, depending on the ductility of the material, for the determination of the remainder of the flexural stress-strain curve.
Kunststoffe - Bestimmung der Biegeeigenschaften (ISO 178:2010)
Diese Internationale Norm legt ein Verfahren zur Ermittlung der Biegeeigenschaften von steifen (siehe
3.12) und halbsteifen Kunststoffen unter definierten Bedingungen fest. Ein genormter Probekörper wird
festgelegt, jedoch sind die Parameter für andere gegebenenfalls anzuwendende Probekörpergrößen
enthalten. Ein Bereich von Prüfgeschwindigkeiten ist enthalten.
1.2 Das Verfahren wird für die Untersuchung des Biegeverhaltens der Probekörper und für die Bestimmung
der Biegefestigkeit, des Biegemoduls und anderer Gesichtspunkte der Biegespannungs-Biegedehnungs-
Beziehung unter den definierten Bedingungen eingesetzt. Es wendet einen frei unterstützten Balken an, der in
der Mitte der Auflagedistanz belastet wird (Dreipunktbiegeversuch).
1.3 Das Prüfverfahren ist zur Anwendung auf folgende Werkstoffgruppen geeignet:
⎯ thermoplastische Formmassen, Extrudiermassen und Gussmassen, einschließlich gefüllter und
verstärkter Compounds in Ergänzung zu den ungefüllten Sorten; steife thermoplastische Platten;
⎯ duroplastische Formmassen, einschließlich gefüllter und verstärkter Compounds; duroplastische Platten.
In Übereinstimmung mit ISO 10350-1 [5] und ISO 10350-2 [6] gilt diese Internationale Norm für
faserverstärkte Compounds mit Faserlängen ≤ 7,5 mm vor der Verarbeitung. In Bezug auf langfaserverstärkte
Werkstoffe (Laminate) mit Faserlängen > 7,5 mm siehe ISO 14125 [7].
Das Verfahren ist üblicherweise nicht für harte Schaumstoffe oder Schicht-Verbundwerkstoffe geeignet, die
Schaumstoffe enthalten. In diesen Fällen kann ISO 1209-1 [3] und/oder ISO 1209-2 [4] angewendet werden.
ANMERKUNG Für bestimmte Sorten textilfaserverstärkter Kunststoffe ist ein Vierpunktbiegeversuch vorzuziehen. Dies
ist in ISO 14125 beschrieben.
Plastiques - Détermination des propriétés en flexion (ISO 178:2010)
L'ISO 178:2010 spécifie une méthode pour la détermination des propriétés en flexion des plastiques rigides et semi-rigides dans des conditions définies. Une éprouvette normalisée est définie, mais des paramètres sont inclus pour d'autres dimensions d'éprouvettes lorsque l'usage est approprié. Une gamme de vitesses d'essai est incluse.
La méthode est utilisée pour l'étude du comportement en flexion des éprouvettes et pour la détermination de la résistance en flexion, du module en flexion et d'autres aspects des relations entre la contrainte et la déformation en flexion dans les conditions définies. Elle s'applique à une poutre supportée sans contrainte, chargée au milieu de sa portée (essai de chargement en trois points).
La méthode est adaptée à la gamme de matériaux suivants:
matériaux thermoplastiques pour moulage, extrusion et coulée, y compris les compositions chargées et renforcées en plus des types non chargés; feuilles thermoplastiques rigides;
matériaux thermodurcissables pour moulage, y compris les compositions chargées et renforcées; feuilles thermodurcissables.
L'ISO 178:2010 s'applique aux compositions renforcées avec des fibres dont les longueurs avant mise en œuvre sont inférieures ou égales à 7,5 mm. Pour les matériaux renforcés de fibres longues (stratifiés) avec des longueurs de fibres supérieures à 7,5 mm, voir l'ISO 14125.
La méthode n'est normalement pas adaptée à l'utilisation de matériaux alvéolaires rigides et de structures sandwichs contenant des matériaux alvéolaires. Dans ces cas, l'ISO 1209-1 et/ou l'ISO 1209-2 peuvent être utilisées.
Contrairement aux éditions précédentes de la présente Norme internationale, la présente édition spécifie deux méthodes, la méthode A et la méthode B. La méthode A est identique à la méthode des éditions précédentes de la présente Norme internationale, c'est-à-dire qu'elle utilise un taux de déformation de 1 %/min durant tout l'essai. La méthode B utilise deux taux de déformation différents, 1 %/min pour la détermination du module en flexion et 5 %/min ou 50 %/min, en fonction de la ductilité du matériau, pour la détermination du reste de la courbe contrainte en flexion-déformation.
Polimerni materiali - Določanje upogibnih lastnosti (ISO 178:2010)
Ta mednarodni standard določa metodo za določanje upogibnih lastnosti trdih (glej točko 3.12) in poltrdih polimernih materialov pod določenimi pogoji. Opredeljen je standardni preskušanec, vendar so vključeni parametri za druge velikosti preskušanca, ki se uporabijo, kjer je to primerno. Vključen je razpon preskusnih hitrosti. Ta metoda se uporablja za preučevanje upogibnega obnašanja preskušanca in za določanje upogibne trdnosti, upogibnih modulov in drugih vidikov razmerja med upogibno napetostjo/raztezkov pod opredeljenimi pogoji. Velja za prosto podprt tram, obremenjen na sredini (tritočkovni obremenitveni preskus). Ta metoda je primerna za uporabo pri naslednjih materialih: – plastomerni materiali za brizganje, materiali za iztiskanje in vlivanje, vključno s polnjenimi in ojačanimi spojinami poleg nepolnjenih vrst; trdi plastomerni trakovi; termoreaktivni materiali za brizganje, vključno s polnjenimi in ojačanimi spojinami; termoreaktivni trakovi.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2011
1DGRPHãþD
SIST EN ISO 178:2003
SIST EN ISO 178:2003/A1:2005
3ROLPHUQLPDWHULDOL'RORþDQMHXSRJLEQLKODVWQRVWL ,62
Plastics - Determination of flexural properties (ISO 178:2010)
Kunststoffe - Bestimmung der Biegeeigenschaften (ISO 178:2010)
Plastiques - Détermination des propriétés en flexion (ISO 178:2010)
Ta slovenski standard je istoveten z: EN ISO 178:2010
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.
EUROPEAN STANDARD
EN ISO 178
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2010
ICS 83.080.01 Supersedes EN ISO 178:2003
English Version
Plastics - Determination of flexural properties (ISO 178:2010)
Plastiques - Détermination des propriétés en flexion (ISO Kunststoffe - Bestimmung der Biegeeigenschaften (ISO
178:2010) 178:2010)
This European Standard was approved by CEN on 14 December 2010.
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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2010 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 178:2010: E
worldwide for CEN national Members.
Contents Page
Foreword .3
Foreword
This document (EN ISO 178:2010) 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 NBN.
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 June 2011, and conflicting national standards shall be withdrawn at
the latest by June 2011.
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 178:2003.
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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 178:2010 has been approved by CEN as a EN ISO 178:2010 without any modification.
INTERNATIONAL ISO
STANDARD 178
Fifth edition
2010-12-15
Plastics — Determination of flexural
properties
Plastiques — Détermination des propriétés en flexion
Reference number
ISO 178:2010(E)
©
ISO 2010
ISO 178:2010(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.
© ISO 2010
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2010 – All rights reserved
ISO 178:2010(E)
Contents Page
Foreword .iv
1 Scope.1
2 Normative references.2
3 Terms and definitions .2
4 Principle .5
5 Test machine.5
5.1 General .5
5.2 Test speed.5
5.3 Supports and loading edge .6
5.4 Force- and deflection-measuring systems .6
5.5 Equipment for measuring the width and thickness of the test specimens.7
6 Test specimens.8
6.1 Shape and dimensions .8
6.2 Anisotropic materials.9
6.3 Preparation of test specimens .9
6.4 Specimen inspection.10
6.5 Number of test specimens.10
7 Atmosphere for conditioning and testing.10
8 Procedure.10
9 Calculation and expression of results .13
9.1 Flexural stress .13
9.2 Flexural strain .13
9.3 Flexural modulus.14
9.4 Statistical parameters .14
9.5 Significant figures .14
10 Precision .15
11 Test report.15
Annex A (informative) Precision statement.16
Annex B (informative) Influence of changes in test speed on the measured values of flexural
properties .18
Bibliography.19
ISO 178:2010(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 178 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 2, Mechanical
properties.
This fifth edition cancels and replaces the fourth edition (ISO 178:2001), which has been technically revised to
[2]
harmonize it with ISO 527-2 with respect to the test speeds used for the determination of the flexural
modulus and for the determination of other flexural properties. This has been done by specifying two methods,
method A and method B. Method A is identical to the method specified in previous editions of ISO 178, i.e. it
uses the same strain rate throughout the test, whereas method B uses two different strain rates (see 1.8 for
details).
It also incorporates the Amendment ISO 178:2001/Amd.1:2004.
iv © ISO 2010 – All rights reserved
INTERNATIONAL STANDARD ISO 178:2010(E)
Plastics — Determination of flexural properties
1 Scope
1.1 This International Standard specifies a method for determining the flexural properties of rigid (see 3.12)
and semi-rigid plastics under defined conditions. A standard test specimen is defined, but parameters are
included for alternative specimen sizes for use where appropriate. A range of test speeds is included.
1.2 The method is used to investigate the flexural behaviour of the test specimens and to determine the
flexural strength, flexural modulus and other aspects of the flexural stress/strain relationship under the
conditions defined. It applies to a freely supported beam, loaded at midspan (three-point loading test).
1.3 The method is suitable for use with the following range of materials:
⎯ thermoplastic moulding, extrusion and casting materials, including filled and reinforced compounds in
addition to unfilled types; rigid thermoplastics sheets;
⎯ thermosetting moulding materials, including filled and reinforced compounds; thermosetting sheets.
[5] [6]
In agreement with ISO 10350-1 and ISO 10350-2 , this International Standard applies to fibre-reinforced
compounds with fibre lengths u 7,5 mm prior to processing. For long-fibre-reinforced materials (laminates)
[7]
with fibre lengths > 7,5 mm, see ISO 14125 .
The method is not normally suitable for use with rigid cellular materials or sandwich structures containing
[3] [4]
cellular material. In such cases, ISO 1209-1 and/or ISO 1209-2 can be used.
NOTE For certain types of textile-fibre-reinforced plastic, a four-point bending test is preferred. This is described in
ISO 14125.
1.4 The method is performed using specimens which may be either moulded to
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.