ISO INTERNATIONAL STANDARD 10112 First edition 1991-09-15 Damping materials -- Graphical presentation of the complex modulus Materiaux amortissants - Représentation graphique du module complexe Reference number ISO 10112:1991(E) Not for Resale IS0 10112:1991(E) 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 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, govern- mental and non-governmental, in liaison with isO, also take part in the work. iso collaborates closely with the International Electrotechnical Commission (lEC) 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 Inter- national Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IsO 10112 was prepared by Technical Committee ISO/TC 108, Mechanical vibration and shock Annex A of this International Standard is for information only @ ISO 1991 All rights reserved. No part of this publication may be reproduced or utilized in any form permission in writing from the publisher. Internationai Organization for Standardization Case Postale 56·CH-1211 Geneve 20*Switzerland Printed in Switzerland ii ensefromIHS Not for Resale ISO 10112:1991(E) Introduction Damping is one potential approach to reducing vibration levels in a structural system. Damping is the dissipation of vibratory energy by converting it into heat, as distinguished from transporting it to another part of the system. When the damping is due to internal energy dissi- the damping is of engineering significance, the material is called a vi- bration damping material. The energy dissipation is due to molecular or crystal-lattice interactions and can be measured in terms of the possible sources of damping, such as plastic deformations in the joints, relative slip at joints, air pumping in the joints, acoustic radiation of en- ergy, eddy current losses, etc, are not covered in this international Standard The mechanical properties of most damping materials depend on fre quency, temperature and strain amplitude at large strains; since this International Standard is restricted to linear behaviour, it does not cover the strain amplitude effect. ili ited withoutlicense from IHS Not for Resale