ISO INTERNATIONAL STANDARD 6892-4 Firstedition 2015-10-01 Metallic materials - Tensile testing Part 4: Method of test in liquid helium Matériauxmétalliques-Essai detraction- Partie 4: Methode d'essai dans I'helium liquide Reference number IS06892-4:2015(E) ISO Intemational Organization for Standardization @IS02015 Institute of S lardization5956617 No reproduction or itted without license from IHS IS06892-4:2015(E) COPYRIGHTPROTECTEDDOCUMENT IS02015,PublishedinSwitzerland 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 Ch. de Blandonnet 8.CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +4122 749 09 47 copyright@iso.org www.iso.org etworking permitted without license from IHS Not for Resale, 2015/11/30 07:19:13 IS0 6892-4:2015(E) Contents Page Foreword ..iv Introduction.. 1 Scope.. 2 Normative references 3 Terms and definitions 4 Symbols and designations 5 Principle 6 Apparatus. 2. 7 Testpiece .7 7.1 General .7 7.2 Standardroundbartestpiece .7 7.3 Alternatives 1 7.4 Sub-size test pieces .7 7.5 Sampling. .7 8 Testing conditions .8 8.1 Test piece installation .8 8.2 Cooling procedure. ..8 8.3 Rate of testing. 8.3.1 Ratelimit .8 8.3.2 Rateselection .8 9 Procedure .9 9.1 Determination of original cross-sectional area (So) 9 9.2 Marking of the original gauge length (Lo) ..9 9.3 Determination of percentage elongation after fracture (A) 9 9.4 Determination of the 0,2 % proof-strength, plastic extension (Rpo,2) .9 9.5 Discontinuous yielding strength (Ri) .10 9.6 Tensile strength (Rm) .10 9.7 Reduction of area (Z) ..10 10 Test report. ..10 11 Measurementuncertainty ..10 AnnexA(informative)Examplesoftestpiecesfortensiletestinginliquidhelium ..11 Bibliography .13 iii ithout license from IHS