ISO-6721-2-1994.pdf
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1、W 4851903 Ob09821 T45 INTERNATIONAL STANDARD 6721-21994 TECHNICAL CORRIGENDUM 1 Pu blished 199543-1 5 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MMiPYWPODHAR OPrAHM3AilMR no C T W P M W M M ORGANISATION INTERNATIONALE DE NORMALISATION Plastics - Determination of dynamic mechanical properties - P
2、art 2: Torsion-pendu I um met hod TECHNICAL CORRIGENDUM 1 Plastiques - Dtermination des proprits mcaniques dynamiques - Partie 2: Mthode au pendule de torsion RECTIFICATIF TECHNIQUE I Technical corrigendum 1 to International Standard IS0 6721-2:1994 was prepared by Technical Committee lSO/TC 61, Pla
3、stics, Subcommittee SC 2, Mechanical properties. Page IO Annex C Replace the last sentence in the left-hand column by: “If the range of hlb is limited to a maximum value of 0,6 in equation (2) and a minimum value of 0,6 in equation (31, the maximum error is 0.9 %.“ ICs 83.080.00 Ref. No. IS0 6721-21
4、994/Cor.l:1995(E) Descriptors: plastics, rigid plastics, tests, torsion tests, determination, mechanical properties, dynamic properties, shear modulus, test equipment, torsion pendulums. (o IS01995 Printed in Swberland IS0 6723 PT*Z 94 4853903 0578463 323 I NT E R NAT I O NA L STANDARD IS0 6721-2 Fi
5、rst edition 1994-1 1-01 Plastics - Determination of dynamic mechanical properties - Part 2: Torsion-pendu I um method Plastiques - Dtermination des proprits mcaniques dynamiques - Partie 2: Mthode au pendule de torsion Reference number IS0 6721-211 994(E) -,-,- IS0 6723 PT*2 94 = 4853903 0578464 268
6、 IS0 6721 -2:1994(E) Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a
7、subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and nongovernmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission
8、(IEC) on all matters of electrotechnical standardization. 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. International S
9、tandard IS0 6721-2 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 2, Mechanical properties. Together with IS0 6721-1, it cancels and replaces IS0 537:1989, which has been technically revised. IS0 6721 consists of the following parts, under the general title Plastics - Deter
10、mination 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 vibration - Non-reson
11、ance method - Part 7: Torsional vibration - Non-resonance method Annex A forms an integral part of this part of IS0 6721. Annexes B, C and D are for information only. O IS0 1994 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or
12、by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case Postale 56 CH-1 21 1 Genve 20 Switzerland Printed in Switzerland ii -,-,- IS0 6723 PT*Z 94 4851903 0578465 I T 4 INTERNA
13、TIONAL STANDARD 8 IS0 IS0 6721 -2:1994( E) Plastics - Determination of dynamic mechanical properties - Part 2: Torsion-pendu1 u m method 1 Scope This part of IS0 6721 specifies two methods (A and B) for determining the linear dynamic mechanical properties of plastics, .e. the storage and loss com- p
14、onents of the torsional modulus, as a function of temperature, for small deformations within the fre- quency range from 0,l Hz to 10 Hz. The temperature dependence of these properties, measured over a sufficiently broad range of tempera- tures (for example from - 50 OC to + 150 “C for the majority o
15、f commercially available plastics), gives in- formation on the transition regions (for example the glass transition and the melting transition) of the polymer. It also provides information concerning the onset of plastic flow. The two methods described are not applicable to non-symmetrical laminates
16、 (see IS0 6721-3:1994, Plastics - Determination of dy- namic mechanical properties - Part 3: Flexural vi- bration - Resonance-curve method). The methods are not suitable for testing rubbers, for which the user is referred to IS0 4663:1986, Rubber - Determi- nation of dynamic behaviour of vulcantzate
17、s at low frequencies - Torsion pendulum method. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this part of IS0 6721. At the time of publication, the edition indicated was valid. All standards are subject to revision,
18、and parties to agreements based on this part of IS0 6721 are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 6721-1:1994, Plastics - Determination
19、of dy- namic mechanical properties - Part I: General prin- ciples. 3 Definitions See IS0 6721-1:1994, clause 3. 4 Principle A test specimen of uniform cross-section is gripped by two clamps, one of them fixed and the other con- nected to a disc, which acts as an inertial member, by a rod. The end of
20、 the specimen connected to the disc is excited, together with the disc, to execute freely decaying torsional oscillations. The oscillation mode is that designated IV in IS0 6721-1:1994, table 2, and the type of modulus is G, as defined in IS0 6721-1 :1994, table 3. The inertial member is suspended e
21、ither from the specimen (method A, see figure I), or from a wire (method B, see figure2). In the latter case, the wire is also part of the elastically oscillating system. 1 IS0 6723 PT*Z 94 9 4851903 0574bb 030 I.-) .- - - IS0 6721-2:1994(E) Upper (fixed) clamp Temperature-controlled chamber -Test s
22、pecimen -Lower (movable) clamp n y inertial member Figure 1 - Apparatus for method A A Counterweight I- Wire I inertial member r Rod Upper (movable) clamp Test specimen Temperature-controlled chamber Lower (fixed) clamp L Figure 2 - Apparatus for method B 2 IS0 6723 PT*2 94 m 4853903 05784b7 T77 0 I
23、S0 During a temperature run, the same inertial member can be used throughout the whole run, which results in a frequency decreasing naturally with increasing temperature, or the inertial member can be replaced at intervals by a member of different moment of in- ertia in order to keep the frequency a
24、pproximately constant. During the test, the frequency and the decaying am- plitude are measured. From these quantities, the storage component Gto and loss component G“to of the torsional complex modulus G;, can be calculated. 5 Test apparatus 5.1 Pendulum Two types of torsion pendulum are specified
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