ISO INTERNATIONAL STANDARD 12135 Third edition 2021-07 Metallic materials Unified method of test for the determination of quasistatic fracture toughness Materiaux metalliques - Méthode unifiée d'essai pour la determination de la ténacite quasi statique Reference number IS0 12135:2021(E) ISO @ISO2021 IS0 12135:2021(E) COPYRIGHTPROTECTED DOCUMENT @IS02021 All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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 below or Iso's member body in the country of the requester. IsO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2021 - All rights reserved