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3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-22242-0 SANS 5557:2009Edition 3SOUTH AFRICAN NATIONAL STANDARD Bending tests (longitudinal, transverse and edgewise) on copper strip or sh
4、eet Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001 Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS SANS 5557:2009 Edition 3 Table of changes Change No. Date Scope Foreword This South African standard was approved by National Committee S
5、ABS TC 164, Engineering materials Mechanical testing of metals, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This document was published in May 2009. This document supersedes SABS SM 557:1980 (first revision). SANS 5557:2009 Editi
6、on 3 1 Bending tests (longitudinal, transverse and edgewise) on copper strip or sheet 1 Scope This standard specifies the methods for longitudinal tests, transverse tests, and edgewise tests on copper strip or sheet. 2 Test specimens 2.1 Preparation 2.1.1 Longitudinal and edgewise bend specimens For
7、 the longitudinal and edgewise bend tests, cut specimens of sheet or strip with their major axes parallel to the direction of rolling or drawing (see figures 1 and 2). 2.1.2 Transverse bend specimens For the transverse bend test, cut specimens of sheet with their major axes at right angles to the di
8、rection of rolling or drawing (see figure 3). 2.2 Number and size 2.2.1 Sheet specimens One specimen cut from each sample sheet to a convenient length and of width for the longitudinal and transverse bend tests as given in table 1. Table 1 Thickness and width of sheet specimens 1 2 Thickness Width m
9、m mm 6 2 tbaWhere possible, otherwise full width. bThickness of the material. SANS 5557:2009 Edition 3 2 2.2.2 Strip specimens One specimen cut from each sample of strip to a convenient length and of width as manufactured. 3 Procedure 3.1 Carefully round and smooth the longer edges of the specimen l
10、ongitudinally so that for material up to 3 mm thick the edges are approximately semi-circular, and for material over 3 mm thick the corners of the edges are rounded to a radius of 2 mm. 3.2 Bend the specimen, in the cold state, by steadily applying pressure through the angle and at the radius specif
11、ied in table 2. 3.3 When the specimen AB is required to be “closebent“, bend the specimen as shown in figure 4 at right angles to the length BC and flatten it until closed, i.e. until B assumes the position indicated by D. 3.4 When the specimen is required to be bent at a given radius, i.e. “openben
12、t“, bend the specimen as shown in figure 5, at right angles to the length BC over a former that has the required radius and until the legs of the specimen are parallel, i.e. until B assumes the position indicated by D. NOTE It may happen that, after the removal of the constraint, the two legs of the
13、 “U“ (CD and CA in figure 5) are no longer parallel but are inclined at a small angle. This effect should be ignored. 3.5 Upon completion of the bending, examine the specimen by normal unaided eyesight for cracks on the convex surface. Table 2 Bending requirements 1 2 3 4 5 Angle of bend Nature of t
14、est Temper of material Type of bend degrees Radius of bend Annealed Close 180 Transverse and longitudinal bend Half-hard Open 180 taHard Open 90 taEdgewise bend (specimen on edge) Annealed Open 180 0,5 width aThickness of the material. Figure 1 Longitudinal bend SANS 5557:2009 Edition 3 3 Figure 2 E
15、dgewise bend on strip Figure 3 Transverse bend Figure 4 Close bend Figure 5 Open bend SABS This page has been left blank intentionally SABS Standards Division The objective of the SABS Standards Division is to develop, promote and maintain South African National Standards. This objective is incorpor
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