ISO INTERNATIONAL STANDARD 23146 Second edition 2012-12-15 Fine ceramics (advanced ceramics, advanced technical ceramics) Test methods for fracture toughness of monolithic ceramics Single-edge V-notch beam (SEVNB) method Ceramiques techniques-Méthodes d'essai pour la détermination de la ténacité a la rupture des céramiques monolithiques- -Methodesur éprouvette a entaille en V sur une seule face (Méthode SEVNB) Reference number ISO 23146:2012(E) LSO IS02012 I without license from IHS Not for Resale IS0 23146:2012(E) COPYRIGHTPROTECTEDDOCUMENT ISO2012 All rights reserved. Unless otherwise specified, no part of this publication 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 addressbeloworIso'smemberbodyinthecountryoftherequester. ISO copyright office Case postale 56:CH-1211 Geneva 20 Tel.+41227490111 Fax + 4122 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ IS0 2012 - All rights reserved networkingpemittedwithoutlicensefromIHS Not for Resale IS0 23146:2012(E) Contents Page Foreword ..iv 1 Scope 2 Normative references .1 3 Terms and definitions ..1 4 Principle ..1 5 Apparatus. ..2 6 Test piece preparation .3 6.1 Number of test pieces .3 6.2 Test-piece dimensions .4 6.3 Preparing the V-notch by hand .4 6.4 Preparing the V-notches by machine (optional) .7 6.5 Determination of notch-root radius .7 Test procedure .8 7.1 Dimensions of test piece ..8 7.2 Flexural-strength test .8 7.3 Measurement of notch depth .9 7.4 Calculation of fracture toughness .9 8 Precision and bias .11 9 Test report ..11 Annex A (informative) Notch honing by machine ..12 Annex B (informative) Interlaboratory evaluation of the SEvNB fracture toughness testprocedures ..14 Annex C (informative) Corrections for effective crack length greater than notch depth ..16 Bibliography .17 iii se with ISt lout license from IHS Not for Resale