EN ISO 6721-3:2021

Plastics - Determination of dynamic mechanical properties - Part 3: Flexural vibration - Resonance-curve method (ISO 6721-3:2021)

This document specifies a bending-vibration method based upon resonance curves for determining the flexural complex modulus E*f of homogeneous plastics and the damping properties of laminated plastics intended for acoustic insulation, for example systems consisting of a metal sheet coated with a damping plastic layer, or sandwich systems consisting of two sheet-metal layers with an intermediate plastic layer. For many purposes, it is useful to determine these properties as a function of temperature and frequency.

Kunststoffe - Bestimmung dynamisch-mechanischer Eigenschaften - Teil 3: Biegeschwingung - Resonanzkurven-Verfahren (ISO 6721-3:2021)

Dieses Dokument legt ein Biegeschwingverfahren fest, bei dem mit Hilfe von Resonanzkurven der komplexe Biegemodul E*f von homogenen Kunststoffen und die Dämpfungseigenschaften von geschichteten Kunststoffen bestimmt werden, die für die Körperschall-Isolation vorgesehen sind. Dies sind beispielsweise Systeme aus Metall¬blech mit dämpfendem Kunststoffbelag oder Verbundsysteme, die aus zwei Metallblechen mit einer Kunststoffzwischenschicht bestehen. Für viele Zwecke ist es vorteilhaft, diese Eigenschaften als Funktion von Temperatur und Frequenz zu bestimmen.

Plastiques - Détermination des propriétés mécaniques dynamiques - Partie 3: Vibration en flexion - Méthode en résonance (ISO 6721-3:2021)

Le présent document spécifie une méthode de vibration en flexion basée sur les courbes de résonance pour la détermination du module complexe en flexion E*f de plastiques homogènes et des propriétés d’amortissement de plastiques stratifiés spécialement destinés à l’isolation acoustique, par exemple des systèmes consistant en une feuille métallique revêtue d’une couche de plastique amortissant ou des systèmes en sandwichs consistant en deux feuilles métalliques avec une couche intermédiaire en plastique. Pour beaucoup d’usages, il est utile de déterminer ces propriétés en fonction de la température et de la fréquence.

Polimerni materiali - Določevanje dinamičnih mehanskih lastnosti - 3. del: Upogibne vibracije - Metoda resonančne krivulje (ISO 6721-3:2021)

General Information

• Status: Published
• Publication Date: 02-Mar-2021
• Withdrawal Date: 29-Sep-2021
• ICS: 83.080.01 - Plastics in general
• Technical Committee: CEN/TC 249 - Plastics
• Drafting Committee: CEN/TC 249/SC 1/WG 3 - Mechanical properties and preparation of test specimens
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 03-Mar-2021
• Completion Date: 03-Mar-2021
• Ref Project: SIST EN ISO 6721-3:2021 - Plastics - Determination of dynamic mechanical properties - Part 3: Flexural vibration - Resonance-curve method (ISO 6721-3:2021)

Relations

• Replaces: EN ISO 6721-3:1996 - Plastics - Determination of dynamic mechanical properties - Part 3: Flexural vibration - Resonance-curve method (ISO 6721-3:1994, including Technical Corrigendum 1: 1995)
• Effective Date: 10-Mar-2021

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2021
Nadomešča:
SIST EN ISO 6721-3:1999
Polimerni materiali - Določevanje dinamičnih mehanskih lastnosti - 3. del:
Upogibne vibracije - Metoda resonančne krivulje (ISO 6721-3:2021)
Plastics - Determination of dynamic mechanical properties - Part 3: Flexural vibration -
Resonance-curve method (ISO 6721-3:2021)
Kunststoffe - Bestimmung dynamisch-mechanischer Eigenschaften - Teil 3:
Biegeschwingung - Resonanzkurven-Verfahren (ISO 6721-3:2021)
Plastiques - Détermination des propriétés mécaniques dynamiques - Partie 3: Vibration
en flexion - Méthode en résonance (ISO 6721-3:2021)
Ta slovenski standard je istoveten z: EN ISO 6721-3:2021
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 6721-3
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2021
EUROPÄISCHE NORM
ICS 83.080.01 Supersedes EN ISO 6721-3:1996
English Version
Plastics - Determination of dynamic mechanical properties
- Part 3: Flexural vibration - Resonance-curve method (ISO
6721-3:2021)
Plastiques - Détermination des propriétés mécaniques Kunststoffe - Bestimmung dynamisch-mechanischer
dynamiques - Partie 3: Vibration en flexion - Méthode Eigenschaften - Teil 3: Biegeschwingung -
en résonance (ISO 6721-3:2021) Resonanzkurven-Verfahren (ISO 6721-3:2021)
This European Standard was approved by CEN on 14 February 2021.

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, Turkey 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
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 6721-3:2021 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 6721-3:2021) 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 September 2021, and conflicting national standards
shall be withdrawn at the latest by September 2021.
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 6721-3:1996.
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,
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, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 6721-3:2021 has been approved by CEN as EN ISO 6721-3:2021 without any
modification.
INTERNATIONAL ISO
STANDARD 6721-3
Second edition
2021-02
Plastics — Determination of dynamic
mechanical properties —
Part 3:
Flexural vibration — Resonance-
curve method
Plastiques — Détermination des propriétés mécaniques
dynamiques —
Partie 3: Vibration en flexion — Méthode en résonance
Reference number
ISO 6721-3:2021(E)
©
ISO 2021
ISO 6721-3:2021(E)
© ISO 2021
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
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Published in Switzerland
ii © ISO 2021 – All rights reserved

ISO 6721-3:2021(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative reference . 1
3 Terms and definitions . 1
4 Principle . 1
5 Test apparatus . 2
5.1 General . 2
5.2 Clamps or suspension fibres . 2
5.3 Exciter and detector . 2
5.4 Temperature-controlled enclosure . 3
5.5 Gas supply . 3
5.6 Temperature-measurement device . 3
5.7 Devices for measuring test specimen dimensions . 4
6 Test specimens. 4
6.1 General . 4
6.2 Shape and dimensions . 5
6.3 Preparation . 5
7 Number of test specimens . 5
8 Conditioning . 5
9 Procedure. 5
9.1 Test atmosphere . 5
9.2 Measurement of specimen cross-section . 5
9.3 Measurement of specimen density . 5
9.4 Mounting the test specimens and adjustment of the transducers . 6
9.4.1 Method A . 6
9.4.2 Method B . 6
9.4.3 Adjustment of the transducers . 6
9.5 Varying the temperature . 6
9.6 Varying the frequency . 6
9.7 Recording the resonance curve . 6
10 Expression of results . 7
10.1 Symbols . 7
10.2 Calculation of flexural storage modulus, E' .
f 7
10.3 Calculation of flexural loss factor, tan δ .
f 8
10.4 Calculation of flexural loss modulus, E” .
f 8
10.5 Plotting the complex modulus as a function of temperature . 8
11 Precision . 8
11.1 Storage modulus . 8
11.2 Loss factor . 8
11.3 Precision of the methods . 9
12 Test report . 9
Annex A (informative) Interlaboratory testing .10
Bibliography .13
ISO 6721-3:2021(E)
Foreword
ISO (t
...