ISO 6721-7 AMD 1-2007 Plastics - Determination of dynamic mechanical properties - Part 7 Torsional vibration - Non-resonance method Amendment 1《塑料 动态机械性能的测定 第7部.pdf

1、 Reference number ISO 6721-7:1996/Amd.1:2007(E) ISO 2007INTERNATIONAL STANDARD ISO 6721-7 First edition 1996-06-01 AMENDMENT 1 2007-02-01 Plastics Determination of dynamic mechanical properties Part 7: Torsional vibration Non-resonance method AMENDMENT 1 Plastiques Dtermination des proprits mcanique

2、s dynamiques Partie 7: Vibration en torsion Mthode hors rsonance AMENDEMENT 1 ISO 6721-7:1996/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 a

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7、SO 2007 All rights reservedISO 6721-7:1996/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 ou

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11、s 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 6721-7:1996 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 2, Mechanical properties. ISO 6721-7:1996/Amd.1:2007(E) ISO

12、 2007 All rights reserved 1 Plastics Determination of dynamic mechanical properties Part 7: Torsional 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 torsional, non-resonanc

13、e method for determining the components of the shear complex modulus G* of solid polymers in the form of bars or rods at frequencies typically in the range 0,001 Hz to 100 Hz. Higher-frequency measurements can be made, but significant errors may be obtained in the dynamic properties measured (see 10

14、.2.1 and 10.2.2). The method is suitable for measuring dynamic storage moduli ranging from about 10 MPa, which is typical of values obtained for stiff rubbers, to values of about 10 GPa which are representative of fibre-reinforced plastics. Although materials with moduli less than 10 MPa may be stud

15、ied, more accurate measurements of their dynamic properties can be made using simple shear (see ISO 6721-6) or torsional deformations of thin layers between parallel plates.” Page 3, Subclause 9.5 Replace Note 4 by the following paragraph (grey shading indicates new text): “If the maximum shear stra

16、in 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 the polymer and the temperature, and is typically in the region of 0,2 % for glassy plastics

17、. 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 frequency should be used for this purpose to minimize any temperature increase caused by me

18、chanical 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 6721-7:1996/Amd.1:2007(E) ICS 83.080.01 Price based on 1 page ISO 2007 All rights reserved