7799 International Standard (ISO) INTERNATIONALORGANIZATION FOR STANDARDIZATION MEXKAYHAPOAHAH OPFAHW3ALMA HO CTAHAAPTW3AUWMORGANISATION INTERNATIONALEDE NORMALISATION Metallic materials - Sheet and strip 3 mm thick or less Reverse bend test Matériaux métalliques -- Toles et feuillards d'épaisseur inférieure ou égale a 3 mm -- Essai de pliage alterne First edition --- 1985-10-01 ISO 7799-1985 (E) UDC 669-415 : 620.177.6 Ref. No. 1SO 7799-1985 (E) Descriptors : metals, sheet metal, strips, tests, mechanical tests, reverse bend tests, test equipment. Price based on 3 pages Copyright International Organization for Standardization d without license from IHS Not for Resale Foreword iSo (the International Organization for Standardization) is a worldwide federation of nationat standards bodies (Iso member bodies). The work of preparing International Standards is normally carried out through ISo technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. international organizations, govern- mental and non-governmental, in liaison with Iso, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the Iso Council. They are approved in accordance with ISO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 7799 was prepared by Technical Committee ISO/TC 164, Mechanical testing of metals. It cancels and replaces Iso Recommendation R 88-1959, of which it constitutes a technical revision. @ International Organization for Standardization, 1985 Printed in Switzerland Copyright International Organization for Standardization ISO 7799-1985 (E) INTERNATIONAL STANDARD Metallic materials -- Sheet and strip 3 mm thick or less Reverse bend test 1 Scope and field of application Table 1 This International Standard specifies the method for determin- Symbol Designation Unit ing the ability of sheet and strip from metallic materials 3 mm Thickness of test piece mm a thick or less to undergo piastic deformation in reverse bending. Radius of cylindrical supports mm Distance from top tangential plane of h mm This method can be applied to aluminium and its alloys only cylindrical supports to the bottom face of guide after previous agreement. Distance from a plane defined by the axes of y mm cylindrical supports and the nearest point of contact with the test piece 2 Principle Number of reverse bends Nb The reverse bend test consists of repeated bending through 90°, in opposite directions, of a rectangular test piece held at one end, each bend being over a cylindrical support of specified radius. Testing equipment 4 3 Symbols and designations 4.1 General Symbols and designations used in the reverse bend test are The testing machine shall be constructed so as to conform with shown in figure 1 and specified in table 1. the principles indicated in figure 1. a Operating handle Guide Pivoting axis of the bending arm 0,1mm max. Cylindrical supports A and B Grips Nearest point of contact with test piece Gripping faces Figure 1 Copyright International Organization for Standardization censefromIHS Not for Resale