ISO INTERNATIONAL STANDARD 18489 First edition 2015-09-01 Polyethylene (PE) materials for piping systems Determination of resistance to slow crack growth under cyclic loading Cracked Round Bar test method Matériaux polyéthylene (PE) pour systemes de tuyauterie - Determination de la résistance a la propagation lente de fissures sous un chargement cyclique - Méthode d'essai de la barre ronde fissurée Reference number ISO 18489:2015(E) SO International Organization for Standardization @ IS0 2015 dardization 5956617 vided by IHS under ed without license from IHS IS0 18489:2015(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2015, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISO copyrightoffice Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org PrganizationforStandardization Not for Resale, 2015/11/11 07:17:05 etworking permitted without license from IHS IS0 18489:2015(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references 3 Terms and definitions 4 Principle ..3 5 Apparatus .3 5.1 Testmachine .3 5.1.1 Loading system. .3 5.1.2 Load-cycle frequency .4 5.1.3 Grips. ..4 5.1.4 Temperature chamber .4 5.2 Microscope ..4 5.3 Notching apparatus.. 4 6 Test specimen. .4 6.1 Specimen geometry and dimensions 6.2 Test specimen preparation .5 6.3 Specimen notching ..5 6.4 Specimen conditioning. .6 7 Test procedure .6 7.1 Measurement of specimen dimensions. .6 7.2 Specimen mounting. .6 7.3 Test atmosphere .6 7.4 Calculation of test load ..6 7.5 Load application. .7 7.6 Notch depth measurement. 8 Data treatment 9 Test report Annex A (informative) Comparison of different test specimen diameters ..10 Bibliography .11 iii see=Zhejiang Institute of Standardization 5956617 vided by IHS under lic cense with ISC vithoutlicense from IHS