ISO INTERNATIONAL STANDARD 8491 Second edition 1998-11-01 Metallic materials Tube (in full section) - Bend test Matériaux métalliques - Tubes Essai de cintrage sur troncon TSO Referencenumber ISO 8491:1998(E) IHSunder Not for Resale ISO 8491:1998(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies (isO committees. Each member body interested in a subject for which a technical committee has been established has liaison with isO, also take part in the work. isO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International StandardISO8491wasprepared byTechnical CommitteeISO/TC164,Mechanicaltestingof metals Subcommittee SC 2, Ductility testing This second edition cancels and replaces the first edition (isO 8491:1986), of which it constitutes a technical revision. Annex A of this International Standard is for information only. @ISO1998 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic International OrganizationforStandardization Case postale 56·CH-1211Geneve 20·Switzerland Internet [email protected] Printed in Switzerland ational Organization for Standardization ISO 8491:1998(E) INTERNATIONAL STANDARD @ISO Metallic materials Tube (in full section) Bend test 1 Scope This International Standard specifies a method for determining the ability of full-section metallic tubes of circular than 65 mm, although the range of the outside diameter for which this International Standard is applicable may be more exactly specified in the relevant product standard. NOTE - Bend tests of the test pieces taken from tubes in the form of transverse strips should be made in accordance with Iso 7438 so as to increase the original curvature of the test piece. 2 Symbols, designations and units Symbols, designations and units for the bend test of tubes in full section are given in table 1 and are shown in figure 1. Table 1 Symbol Designation Unit aa Wall thickness of the tube mm D Outside diameter of the tube mm L Length of the test piece before the test mm r Inside radius at the bottom of the groove mm α Angle of the bend degree The symbol T is also used in steel tube standards. / Figure 1 Copyright International Organization for Standardization THS unde Not for Resale