ISO INTERNATIONAL STANDARD 15850 Second edition 2014-02-15 Plastics Determination of tension tension fatigue crack propagation - Linear elastic fracture mechanics (LEFM) approach Plastiques - Détermination de la propagation de fissure par fatigue en traction - Approche de la mécanique linéaire élastique de la rupture (LEFM) Reference number IS0 15850:2014(E) LSO @ IS0 2014 Not for Resale IS0 15850:2014(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2014 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form 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 copyright@iso.org Web www.iso.org Published in Switzerland @ IS0 2014 - All rights reserved No reproductic networking permited without license from IHS Not for Resale IS0 15850:2014(E) Contents Page Foreword ..iv 1 Scope .1 2 Normative references 3 Terms and definitions 4 Principle 5 Significance and use .5 6 Test specimens. ..6 6.1 Shape and size .6 6.2 Preparation. .9 6.3 Notching. .9 6.4 Side grooves. .10 6.5 Conditioning. ..10 7 Apparatus. .10 7.1 Test machine. 10 7.2 Grips .11 7.3 Crack length measurement 11 7.4 Test atmosphere .15 8 Test procedure. .15 8.1 Measurement of specimen dimensions .15 8.2 Specimen mounting .15 8.3 Loading. .15 8.4 Out-of-plane crack propagation .15 8.5 Discontinuous crack propagation .15 8.6 Number of tests. 15 9 Calculation and interpretation of results .16 9.1 Crack length versus number of cycles. .16 9.2 Crackcurvaturecorrection .16 9.3 Crack growth rate da/dN .16 9.4 Stress intensity factor range AK 16 9.5 Energy release rate range AG .17 10 Test report. .17 10.1 General. 17 10.2 For fatigue crack propagation test .17 10.3 For fatigue crack propagation to failure test 18 Annex A (informative) Abnormality in the use of cyclic fatigue crack propagation test for ranking long-term static fatigue behaviour 19 Bibliography .23 iii ed without license from IHS Not for Resale