ISO-6721-1-2001.pdf
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1、INTERNATIONAL STANDARD ISO 6721-1 Second edition 2001-05-15 Reference number ISO 6721-1:2001(E) ISO 2001 Plastics Determination of dynamic mechanical properties Part 1: General principles Plastiques Dtermination des proprits mcaniques dynamiques Partie 1: Principes gnraux ISO 6721-1:2001(E) ii ISO 2
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5、ress given below. ISO 2001 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, elec- tronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or I
6、SOs mem- ber 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 copyrightiso.ch Web www.iso.ch Printed in Switzerland -,-,- ISO 6721-1:2001(E) ISO 2001 All rights reserved iii Foreword ISO (the Internationa
7、l 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 es
8、tablished 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 standardi
9、zation. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. 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 7
10、5 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this part of ISO 6721 may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. International Standard ISO 6721-1 was prepared by Te
11、chnical Committee ISO/TC 61,Plastics, Subcommittee SC 2, Mechanical properties. This second edition cancels and replaces the first edition (ISO 6721-1:1994), of which it constitutes a minor revision (two further references have been added to the bibliography). ISO 6721 consists of the following part
12、s, under the general titlePlastics 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
13、 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 Additional parts ar
14、e planned. Annexes A and B of this part of ISO 6721 are for information only. -,-,- ISO 6721-1:2001(E) iv ISO 2001 All rights reserved Introduction The methods specified in the first nine parts of ISO 6721 can be used for determining storage and loss moduli of plastics over a range of temperatures o
15、r frequencies by varying the temperature of the specimen or the frequency of oscillation. Plots of the storage or loss moduli, or both, are indicative of viscoelastic characteristics of the specimen. Regions of rapid changes in viscoelastic properties at particular temperatures or frequencies are no
16、rmally referred to as transition regions. Furthermore, from the temperature and frequency dependencies of the loss moduli, the damping of sound and vibration of polymer or metal-polymer systems can be estimated. Apparent discrepancies may arise in results obtained under different experimental condit
17、ions. Without changing the observed data, reporting in full (as described in the various parts of ISO 6721) the conditions under which the data were obtained will enable apparent differences observed in different studies to be reconciled. The definitions of complex moduli apply exactly only to sinus
18、oidal oscillations with constant amplitude and constant frequency during each measurement. On the other hand, measurements of small phase angles between stress and strain involve some difficulties under these conditions. Because these difficulties are not involved in some methods based on freely dec
19、aying vibrations and/or varying frequency near resonance, these methods are used frequently (see ISO 6721-2 and ISO 6721-3). In these cases, some of the equations that define the viscoelastic properties are only approximately valid. INTERNATIONAL STANDARDISO 6721-1:2001(E) ISO 2001 All rights reserv
20、ed 1 Plastics Determination of dynamic mechanical properties Part 1: General principles 1Scope The various parts of ISO 6721 specify methods for the determination of the dynamic mechanical properties of rigid plastics within the region of linear viscoelastic behaviour. This part of ISO 6721 is an in
21、troductory section which includes the definitions and all aspects that are common to the individual test methods described in the subsequent parts. Different deformation modes may produce results that are not directly comparable. For example, tensile vibration results in a stress which is uniform ac
22、ross the whole thickness of the specimen, whereas flexural measurements are influenced preferentially by the properties of the surface regions of the specimen. Values derived from flexural-test data will be comparable to those derived from tensile-test data only at strain levels where the stress-str
23、ain relationship is linear and for specimens which have a homogeneous structure. 2Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of ISO 6721. For dated references, subsequent amendments to, or revisi
24、ons of, any of these publications do not apply. However, parties to agreements based on this part of ISO 6721 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative doc
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