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 Ef
* 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)

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

General Information

Status
Published
Public Enquiry End Date
30-Apr-2020
Publication Date
24-Mar-2021
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
11-Mar-2021
Due Date
16-May-2021
Completion Date
25-Mar-2021

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SLOVENSKI STANDARD
SIST EN ISO 6721-3:2021
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
SIST EN ISO 6721-3:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 6721-3:2021
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SIST EN ISO 6721-3:2021
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.
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SIST EN ISO 6721-3:2021
EN ISO 6721-3:2021 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 6721-3:2021
EN ISO 6721-3:2021 (E)
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.
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SIST EN ISO 6721-3:2021
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SIST EN ISO 6721-3:2021
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
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SIST EN ISO 6721-3:2021
ISO 6721-3:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved
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SIST EN ISO 6721-3:2021
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 2021 – All rights reserved iii
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SIST EN ISO 6721-3:2021
ISO 6721-3:2021(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.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).

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. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/

iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 5, Physical-

chemical properties, in collaboration with the European Committee for Standardization (CEN) Technical

Committee CEN/TC 249, Plastics, in accordance with the Agreement on technical cooperation between

ISO and CEN (Vienna Agreement).

This second edition cancels and replaces the first edition (ISO 6721-3:1994), which has been technically

revised. It also incorporates the Technical Corrigendum ISO 6721-3:1994/Cor 1:1995.

The main changes compared to the previous edition are as follows:
— the document has been revised editorially;
— the normative references have been updated;
— the NOTE in Clause 3 has been moved to Clause 4;
— the method of specimen density measurement has been defined.
A list of all parts in the ISO 6721 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 © ISO 2021 – All rights reserved
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SIST EN ISO 6721-3:2021
INTERNATIONAL STANDARD ISO 6721-3:2021(E)
Plastics — Determination of dynamic mechanical
properties —
Part 3:
Flexural vibration — Resonance-curve method
1 Scope

This document specifies a bending-vibration method based upon resonance curves for determining the

flexural complex modulus E 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.
2 Normative reference

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) applie

...

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