BS ISO 18437-5-2011 Mechanical vibration and shock Characterization of the dynamic mechanical properties of visco-elastic materials Poisson ratio based on comparison between measur.pdf
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1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 18437-5:2011Mechanical vibration and shock Characterization of thedynamic mechanical propertiesof visco-elastic materialsPart 5: Poisson ratio based on comparisonbetween m
2、easurements and finite elementanalysisBS ISO 18437-5:2011 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 18437-5:2011.The UK participation in its preparation was entrusted to TechnicalCommittee GME/21, Mechanical vibration, shock and conditionmonitoring.A list
3、 of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 69158 4ICS 17.160Compliance with a British Stand
4、ard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 May 2011.Amendments issued since publicationDate Text affectedBS ISO 18437-5:2011Reference numberISO 18437-5:2011(E)ISO 2011INTERNATIONAL STAND
5、ARD ISO18437-5First edition2011-04-15Mechanical vibration and shock Characterization of the dynamic mechanical properties of visco-elastic materials Part 5: Poisson ratio based on comparison between measurements and finite element analysis Vibrations et chocs mcaniques Caractrisation des proprits mc
6、aniques dynamiques des matriaux visco-lastiques Partie 5: Nombre de Poisson obtenu par comparaison entre les mesures et lanalyse par lments finis BS ISO 18437-5:2011ISO 18437-5:2011(E) COPYRIGHT PROTECTED DOCUMENT ISO 2011 All rights reserved. Unless otherwise specified, no part of this publication
7、may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Te
8、l. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2011 All rights reservedBS ISO 18437-5:2011ISO 18437-5:2011(E) ISO 2011 All rights reserved iiiContents Page Foreword iv Introduction . v 1 Scope 1 2 Normative references 2 3 Terms and
9、definitions . 2 4 Background and measurement principles 3 5 Single-sample measurement method84 5.1 Introduction 4 5.2 Basic theory . 4 5.3 Specimen geometry and frequency range 4 5.4 Stiffness measurement . 7 5.5 Data acquisition . 7 6 Two-sample measurement method58 6.1 Introduction 8 6.2 Basic the
10、ory . 8 6.3 Determining Poisson ratio 9 6.4 Specimen geometry and frequency range 9 6.4.1 General . 9 6.4.2 Data acquisition . 10 7 Test equipment 10 8 Sample preparation and mounting 11 9 Sample conditioning . 11 10 Main sources of uncertainty . 11 11 Time-temperature superposition . 11 Annex A (in
11、formative) Linearity of resilient materials . 12 Bibliography 13 BS ISO 18437-5:2011ISO 18437-5:2011(E) iv ISO 2011 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing I
12、nternational 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
13、 with ISO, also take part in the work. ISO collaborates 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 tech
14、nical committees is to prepare International Standards. 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 draw
15、n 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. ISO 18437-5 was prepared by Technical Committee ISO/TC 108, Mechanical vibration, shock and condition monitoring. ISO
16、18437 consists of the following parts, under the general title Mechanical vibration and shock Characterization of the dynamic mechanical properties of visco-elastic materials: Part 2: Resonance method Part 3: Cantilever shear beam method Part 4: Dynamic stiffness method Part 5: Poisson ratio based o
17、n comparison between measurements and finite element analysis The following part is under preparation: Part 1: Principles and guidelines BS ISO 18437-5:2011ISO 18437-5:2011(E) ISO 2011 All rights reserved vIntroduction Visco-elastic materials are used extensively to reduce vibrations in structural s
18、ystems through dissipation of energy (damping) or isolation of components and noise levels in acoustical applications through modification of reflection, transmission, or absorption of acoustic energy. It is often required to have specific dynamic mechanical properties in order for such materials to
19、 function in an optimum manner. Energy dissipation is due to interactions on the molecular scale and can be measured in terms of the lag between stress and strain in the material. The dynamic mechanical properties, such as Young modulus, loss factor and Poisson ratio, of most visco-elastic materials
20、 depend on frequency, temperature, pre-strain and strain amplitude. The choice of a specific material for a given application determines the system performance. The goal of this part of ISO 18437 is to provide brief descriptions of several methods, the details in construction of each apparatus, meas
21、urement range, and the limitations of each apparatus. This part of ISO 18437 applies to the linear behaviour observed at small strain amplitudes. BS ISO 18437-5:2011BS ISO 18437-5:2011INTERNATIONAL STANDARD ISO 18437-5:2011(E) ISO 2011 All rights reserved 1Mechanical vibration and shock Characteriza
22、tion of the dynamic mechanical properties of visco-elastic materials Part 5: Poisson ratio based on comparison between measurements and finite element analysis 1 Scope This part of ISO 18437 specifies two methods for estimating Poisson ratio or/and elastic modulus for isotropic visco-elastic or poro
23、us-elastic materials for use in linear finite element method (FEM) computer programs or other numerical approaches to vibrational or acoustic problems in visco-elastic structures of complicated geometry. The method is based on comparison between measurements of force-deflection or stiffness characte
24、ristics for disc-shaped specimens, with bonded boundary conditions at both ends, and FEM calculations of those conditions as a function of Poisson ratio. The choice of the single-sample or two-sample measurement method depends on whether the Poisson ratio is to be determined alone or together with t
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