ISO INTERNATIONAL STANDARD 29221 First edition 2014-01-15 Plastics Determination of mode I plane-strain crack-arrest toughness Plastiques - Détermination de la ténacité d'arret de fissure en deformationplane Reference number ISO 29221:2014(E) LSO IS02014 IHS under itted without license from IHS Not for Resale IS0 29221:2014(E) COPYRIGHTPROTECTEDDOCUMENT @ ISO 2014 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 copyright office Case postale 56 : CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ IS0 2014 - All rights reserved etworking permitted without license from IHS Not for Resale IS0 29221:2014(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references ..1 3 Terms and definitions 4 Principle ..2 5 Apparatus .2 5.1 General .2 5.2 Loading arrangement .2 5.3 Displacement gauge. .4 6 Test specimen .5 6.1 General. .5 6.2 Dimensions .5 6.3 Starter notch .6 7 Procedure .7 7.1 Measurements of specimen dimensions. .7 7.2 Conditioning .1 7.3 Loading. .7 7.4 Displacement measurement ..8 7.5 Arrested crack length (aa) measurement ..8 7.6 Numberoftests .9 8 Calculation and validation of results ..10 8.1 Calculation of Ko and KQa ·10 8.2 Validity requirement. .10 9 Precision ..11 10 Test report. .11 10.1 Test details. ..11 10.2 Calculations ..12 10.3 Validity requirements (see Table 1) .12 10.4 Photographic record of fracture surface and descriptive comments (optional) .12 Annex A (informative) Determination of the initial crack length, ao, when using the chevronnotch ..13 Annex B (informative) Procedure for measuring the arrested crack length (ao) ..15 Annex C (informative) Fracture surface acceptability ..16 Annex D (informative) Comment on precision statement ..17 Bibliography ..18 iii ense with ISt ed without license from IHS Not for Resale