SIST EN ISO 6721-2:2008
(Main)Plastics - Determination of dynamic mechanical properties - Part 2: Torsion-pendulum method (ISO 6721-2:2008)
Plastics - Determination of dynamic mechanical properties - Part 2: Torsion-pendulum method (ISO 6721-2:2008)
This part of ISO 6721 specifies two methods (A and B) for determining the linear dynamic mechanical properties of plastics, i.e. the storage and loss components of the torsional modulus, as a function of temperature, for small deformations within the frequency range from 0,1 Hz to 10 Hz. The temperature dependence of these properties, measured over a sufficiently broad range of temperatures (for example from 50 °C to 150 °C for the majority of commercially available plastics), gives information on the transition regions (for example the glass transition and the melting transition) of the polymer. It also provides information concerning the onset of plastic flow.
Kunststoffe - Bestimmung dynamisch mechanischer Eigenschaften - Teil 2: Torsionspendel-Verfahren (ISO 6721-2:2008)
Dieser Teil von ISO 6721 legt zwei Verfahren (A und B) fest, um die linearen dynamisch mechanischen Eigenschaften von Kunststoffen zu bestimmen, und zwar die Speicher und Verlustkomponenten des Torsionsmoduls als Funktion der Temperatur für kleine Verformungen im Frequenzbereich von 0,1 Hz bis 10 Hz.
Die Temperaturabhängigkeit dieser Größen, ermittelt in einem ausreichend weiten Temperaturbereich (zum Beispiel für die Mehrzahl der kommerziell erhältlichen Kunststoffe von -50 °C bis +150 °C), liefert Informationen zu den Übergangsbereichen (zum Beispiel für den Übergang glasartig gummiartig oder den Schmelzübergang) des Kunststoffs. Außerdem werden Informationen zum Beginn des plastischen Fließens angegeben. Die beschriebenen beiden Verfahren sind nicht anwendbar auf unsymmetrische Laminate (siehe ISO 6721 3, Plastics Determination of dynamic mechanical properties Part 3: Flexural vibration Resonance curve method). Die Verfahren sind nicht geeignet zur Prüfung von Elastomeren. Hierzu wird verwiesen auf ISO 4664 2, Rubber, vulcanized or thermoplastic Determination of dynamic properties Part 2: Torsion pendulum methods at low frequencies.
Plastiques - Détermination des propriétés mécaniques dynamiques - Partie 2: Méthode au pendule de torsion (ISO 6721-2:2008)
L'ISO 6721-2:2008 spécifie deux méthodes (A et B) pour la détermination des propriétés mécaniques dynamiques linéaires, telles que les composantes de conservation et de perte du module en torsion, des plastiques dans le domaines des petites déformations en fonction de la température dans la gamme de fréquences de 0,1 Hz à 10 Hz.
La dépendance thermique de ces propriétés, mesurée sur une gamme de températures suffisamment large (par exemple de -50 °C à +150 °C pour la majorité des plastiques commercialement disponibles), donne des informations sur les zones de transition (par exemple transition vitreuse ou fusion) d'un polymère. Elle donne aussi une information au sujet du début de l'écoulement d'un plastique. Les deux méthodes décrites ne sont pas applicables aux stratifiés asymétriques au sujet desquels il y a lieu de se reporter à l'ISO 6721-3, Plastiques — Détermination des propriétés mécaniques dynamiques — Partie 3: Vibration en flexion — Méthode en résonance. Les méthodes ne s'appliquent pas non plus pour l'essai de caoutchoucs au sujet desquels il convient de se reporter à l'ISO 4664-2, Caoutchouc vulcanisé ou thermoplastique — Détermination des propriétés dynamiques — Partie 2: Méthodes du pendule de torsion à basses fréquences.
Polimerni materiali - Določevanje dinamičnih mehanskih lastnosti - 2. del: Metoda s torzijskim nihalom (ISO 6721-2:2008)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 6721-2:2008
01-september-2008
1DGRPHãþD
SIST EN ISO 6721-2:1999
3ROLPHUQLPDWHULDOL'RORþHYDQMHGLQDPLþQLKPHKDQVNLKODVWQRVWLGHO 0HWRGD
VWRU]LMVNLPQLKDORP ,62
Plastics - Determination of dynamic mechanical properties - Part 2: Torsion-pendulum
method (ISO 6721-2:2008)
Kunststoffe - Bestimmung dynamisch mechanischer Eigenschaften - Teil 2:
Torsionspendel-Verfahren (ISO 6721-2:2008)
Plastiques - Détermination des propriétés mécaniques dynamiques - Partie 2: Méthode
au pendule de torsion (ISO 6721-2:2008)
Ta slovenski standard je istoveten z: EN ISO 6721-2:2008
ICS:
83.080.01 Polimerni materiali na Plastics in general
splošno
SIST EN ISO 6721-2:2008 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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EUROPEAN STANDARD
EN ISO 6721-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2008
ICS 83.080.01 Supersedes EN ISO 6721-2:1996
English Version
Plastics - Determination of dynamic mechanical properties - Part
2: Torsion-pendulum method (ISO 6721-2:2008)
Plastiques - Détermination des propriétés mécaniques Kunststoffe - Bestimmung dynamisch mechanischer
dynamiques - Partie 2: Méthode au pendule de torsion (ISO Eigenschaften - Teil 2: Torsionspendel-Verfahren (ISO
6721-2:2008) 6721-2:2008)
This European Standard was approved by CEN on 18 May 2008.
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 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 Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, 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: rue de Stassart, 36 B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 6721-2:2008: E
worldwide for CEN national Members.
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EN ISO 6721-2:2008 (E)
Contents Page
Foreword.3
2
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EN ISO 6721-2:2008 (E)
Foreword
This document (EN ISO 6721-2:2008) 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 December 2008, and conflicting national standards shall be withdrawn
at the latest by December 2008.
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 6721-2:1996.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, 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 6721-2:2008 has been approved by CEN as a EN ISO 6721-2:2008 without any modification.
3
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INTERNATIONAL ISO
STANDARD 6721-2
Second edition
2008-06-01
Plastics — Determination of dynamic
mechanical properties —
Part 2:
Torsion-pendulum method
Plastiques — Détermination des propriétés mécaniques dynamiques —
Partie 2: Méthode au pendule de torsion
Reference number
ISO 6721-2:2008(E)
©
ISO 2008
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ISO 6721-2:2008(E)
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ii © ISO 2008 – All rights reserved
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ISO 6721-2:2008(E)
Contents Page
Foreword. iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Principle. 1
5 Test apparatus . 3
6 Test specimens . 4
7 Number of specimens . 5
8 Conditioning. 5
9 Procedure . 5
10 Expression of results . 6
11 Precision. 9
12 Test report . 9
Annex A (normative) Influence of longitudinal force, W . 10
Annex B (informative) Damping correction factor, F . 11
d
Annex C (informative) Dimensional correction factor, F . 12
c
Bibliography . 14
© ISO 2008 – All rights reserved iii
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ISO 6721-2:2008(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 6721-2 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 2, Mechanical
properties.
This second edition cancels and replaces the first edition (ISO 6721-2:1994), of which it constitutes a minor
revision. It also incorporates the Technical Corrigendum ISO 6721-2:1994/Cor.1:1995. Apart from the
inclusion of the Corrigendum (which concerns the last sentence in the first paragraph in Annex C), the main
changes are the updating of the references and the correction of ISO 6721-3 to ISO 6721-1 in Subclause 5.6.
ISO 6721 consists of the following parts, under the general title Plastics — Determination of dynamic
mechanical properties:
⎯ Part 1: General principles
⎯ Part 2: Torsion-pendulum method
⎯ Part 3: Flexural vibration — Resonance-curve method
⎯ Part 4: Tensile vibration — Non-resonance method
⎯ Part 5: Flexural vibration — Non-resonance method
⎯ Part 6: Shear vibration — Non-resonance method
⎯ Part 7: Torsional vibration — Non-resonance method
⎯ Part 8: Longitudinal and shear vibration — Wave-propagation method
⎯ Part 9: Tensile vibration — Sonic-pulse propagation method
⎯ Part 10: Complex shear viscosity using a parallel-plate oscillatory rheometer
iv © ISO 2008 – All rights reserved
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INTERNATIONAL STANDARD ISO 6721-2:2008(E)
Plastics — Determination of dynamic mechanical properties —
Part 2:
Torsion-pendulum method
1 Scope
This part of ISO 6721 specifies two methods (A and B) for determining the linear dynamic mechanical
properties of plastics, i.e. the storage and loss components of the torsional modulus, as a function of
temperature, for small deformations within the frequency range from 0,1 Hz to 10 Hz.
The temperature dependence of these properties, measured over a sufficiently broad range of temperatures
(for example from −50 °C to +150 °C for the majority of commercially available plastics), gives information on
the transition regions (for example the glass transition and the melting transition) of the polymer. It also
provides information concerning the onset of plastic flow. The two methods described are not applicable to
non-symmetrical laminates (see ISO 6721-3, Plastics — Determination of dynamic mechanical properties —
Part 3: Flexural vibration — Resonance-curve method). The methods are not suitable for testing rubbers, for
which the user is referred to ISO 4664-2, Rubber, vulcanized or thermoplastic — Determination of dynamic
properties — Part 2: Torsion pendulum methods at low frequencies.
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 6721-1:2001, Plastics — Determination of dynamic mechanical properties — Part 1: General principles
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 6721-1:2001, Clause 3, apply.
4 Principle
A test specimen of uniform cross-section is gripped by two clamps, one of them fixed and the other connected
to a disc, which acts as an inertial member, by a rod. The end of the specimen connected to the disc is excited,
together with the disc, to execute freely decaying torsional oscillations. The oscillation mode is that designated
IV in ISO 6721-1:2001, Table 2, and the type of modulus is G as defined in ISO 6721-1:2001, Table 3.
to
The inertial member is suspended either from the specimen (method A, see Figure 1) or from a wire
(method B, see Figure 2). In the latter case, the wire is also part of the elastically oscillating system.
© ISO 2008 – All rights reserved 1
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ISO 6721-2:2008(E)
Key
1 upper (fixed) clamp 4 lower (movable) clamp
2 temperature-controlled chamber 5 rod
3 test specimen 6 inertial member
Figure 1 — Apparatus for method A
Key
1 counterweight 5 upper (movable) clamp
2 wire 6 test specimen
3 inertial member 7 temperature-controlled chamber
4 rod 8 lower (fixed) clamp
Figure 2 — Apparatus for method B
2 © ISO 2008 – All rights reserved
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ISO 6721-2:2008(E)
During a temperature run, the same inertial member can be used throughout the whole run, which results in a
frequency decreasing naturally with increasing temperature, or the inertial member can be replaced at
intervals by a member of different moment of inertia in order to keep the frequency approximately constant.
During the test, the frequency and the decaying amplitude are measured. From these quantities, the storage
*
component G′ and loss component G″ of the torsional complex modulus G can be calculated.
to to to
5 Test apparatus
5.1 Pendulum
Two types of torsion pendulum are specified for use with this part of ISO 6721:
a) the inertial member is suspended from the test specimen and the lower end of the specimen is excited
(method A, Figure 1);
b) the inertial member is suspended from a wire attached to a counterweight and the upper end of the
specimen is excited (method B, Figure 2).
Both types of pendulum consists of an inertial member, two clamps for gripping the specimen (one of which is
connected to the inertial member by a rod) and a temperature-controlled chamber enclosing the specimen and
the clamps. For method B, a counterweight and connecting wire are also required.
5.2 Inertial member
5.2.1 General
The moment of inertia, I, of the inertial member, which may be made of aluminium, for instance, shall be
selected as a function of the torsional stiffness of the specimen, so that the temperature-dependent natural
frequency of the system lies between approximately 0,1 Hz and 10 Hz.
−5 2
When testing standard specimens (see 6.2), a moment of inertia, I, of about 3 × 10 kg⋅m is recommended if
the same inertial member is to be used throughout a run.
−5 2
NOTE For certain materials, e.g. filled polymers, a value of I of about 5 × 10 kg⋅m may be necessary.
If a constant frequency is desired over a broad temperature range, interchangeable inertial members with
different values of I may be used, thereby permitting the moment of inertia to be varied in steps of less than
20 %, i.e. the frequency to be corrected in steps of less than 10 %. When testing standard specimens (see
−3 2
6.2) at a frequency of about 1 Hz, a maximum moment of inertia of about 3 × 10 kg⋅m is recommended.
5.2.2 Method A (see Figure 1)
The total mass of the inertial member, the lower clamp and the connecting rod shall be such that the weight,
W, carried by the specimen is not too high [see Annex A, Equation (A.2)].
5.2.3
...
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