1、 Reference number ISO 6721-5:1996/Amd.1:2007(E) ISO 2007INTERNATIONAL STANDARD ISO 6721-5 First edition 1996-05-15 AMENDMENT 1 2007-02-01 Plastics Determination of dynamic mechanical properties Part 5: Flexural vibration Non-resonance method AMENDMENT 1 Plastiques Dtermination des proprits mcaniques
2、 dynamiques Partie 5: Vibration en flexion Mthode hors rsonance AMENDEMENT 1 ISO 6721-5:1996/Amd.1:2007(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which ar
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5、a problem relating to it is found, please inform the Central Secretariat at the address given below. ISO 2007 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 m
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7、O 2007 All rights reservedISO 6721-5:1996/Amd.1:2007(E) ISO 2007 All rights reserved iii 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
8、 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 col
9、laborates 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 S
10、tandards. 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
11、 of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Amendment 1 to ISO 6721-5:1996 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 2, Mechanical properties. ISO 6721-5:1996/Amd.1:2007(E) ISO
12、2007 All rights reserved 1 Plastics Determination of dynamic mechanical properties Part 5: Flexural vibration Non-resonance method AMENDMENT 1 Page 1, Clause 1 Replace the first paragraph by the following (grey shading indicates new text): “This part of ISO 6721 describes a flexural, non-resonance m
13、ethod for determining the components of the Youngs complex modulus E* of polymers at frequencies typically in the range 0,01 Hz to 100 Hz. Higher- frequency measurements can be made, but significant errors may be obtained in the dynamic properties measured (see 10.2.1 and 10.2.2). The method is suit
14、able for measuring dynamic storage moduli in the range 10 MPa to 200 GPa. Although materials with moduli less than 10 MPa may be studied, more accurate measurements of their dynamic properties can be made using shear modes of deformation (see part 6 of ISO 6721).” Page 3, Subclause 9.5 Replace Note
15、4 by the following paragraph (grey shading indicates new text): “If the maximum tensile strain within the specimen exceeds the limit for linear behaviour, then the derived dynamic properties will depend on the magnitude of the applied displacement. The limiting strain varies with the composition of
16、the polymer and the temperature, and is typically in the region of 0,2 % for glassy plastics. The dynamic strain range for linear behaviour can be explored by varying the dynamic displacement amplitude at a constant frequency and recording any change in dynamic stiffness with strain amplitude. A low
17、 frequency should be used for this purpose to minimize any temperature increase caused by mechanical loss. However, it should be noted that, because of the non-uniform strain in the specimen in this test, the onset of non-linear behaviour will be less apparent than in tests where the strain distribution is uniform. If non-linear behaviour is detected in the strain range of interest, the dynamic strain limit shall be recorded in the test report.” ISO 6721-5:1996/Amd.1:2007(E) ICS 83.080.01 Price based on 1 page ISO 2007 All rights reserved
