1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
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 978-0-626-20824-0 SANS 5790:2008Edition 2 SOUTH AFRICAN NATIONAL STANDARD Impact strength of cups, saucers, and plates Published by Standards South
4、Africa 1 dr lategan road groenkloof private bag x191 pretoria 0001 tel: 012 428 7911 fax: 012 344 1568 international code + 27 12 www.stansa.co.za Standards South Africa SANS 5790:2008 Edition 2 Table of changes Change No. Date Scope Foreword This South African standard was approved by National Comm
5、ittee StanSA TC 5140.05, Crockery, in accordance with procedures of Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement. This document was published in February 2008. This document supersedes SABS SM 790:1974 (edition 1). SANS 5790:2008 Edition 2 1 Impact strength of cups, sa
6、ucers, and plates 1 Scope This standard specifies a method for the determination of the impact strength of cups, saucers, and plates. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies
7、. For undated references, the latest edition of the referenced document (including any amendments) applies. Information on currently valid national and international standards can be obtained from Standards South Africa. SANS 6508-1/ISO 6508-1, Metallic materials Rockwell hardness test Part 1: Test
8、method (scales A,B,C,D,E,F,G,H,K,N,T). SANS 6508-2/ISO 6508-2, Metallic materials Rockwell hardness test Part 2: Verification and calibration of testing machines (scales A,B,C,D,E,F,G,H,K,N,T). 3 Apparatus Impact strength test apparatus, as shown in figures 1(a) and (b) and fitted with a 90 g hammer
9、 and a 90 g dial. The striking face of the hammer shall have a Rockwell C hardness of 60 3 , determined in accordance with SANS 6508-1 and SANS 6508-2. NOTE Other impact strength testing devices may be used provided that they give results comparable to those obtained on the apparatus described in th
10、is standard. 4 Sampling Take a laboratory sample as specified in the relevant product standard. Where no standard exists, take the laboratory sample as agreed upon between the test laboratory and the manufacturer to ensure a reasonable and acceptable reliability at a reasonable and acceptable confid
11、ence level. 5 Procedure 5.1 Cups 5.1.1 So position the cup (on its foot) in the V formed by the V-blocks of the impact strength test apparatus (see figures 1(a) and (b) that only the rim of the cup is in contact with V-blocks, and that, when the hammer hangs perpendicular, the centre of its striking
12、 face just touches the rim of the cup and that the point of contact is in the plane of the bisector of the angle of the V (see figure 2). SANS 5790:2008 Edition 2 2 5.1.2 Subject the cup to a series of hammer blows, beginning with a blow of energy 0,02 J and increasing the energy of each successive
13、blow by an increment of 0,01 J. 5.1.3 Continue until a crack develops in the body of the cup or a part of the body breaks off. 5.2 Saucers and plates 5.2.1 So support the test specimen against the ring that, when the hammer hangs perpendicular, the centre of its striking face just touches the centre
14、 of the bottom of the specimen (see figure 3). 5.2.2 Subject the test specimen to a series of hammer blows, beginning with a blow of energy 0,02 J and increasing the energy of each successive blow by an increment of 0,01 J until the energy reaches 0,14 J and then by increments of 0,02 J until a hole
15、 is formed or a crack (that is visible on both sides of the test specimen) develops. 6 Test report Report the following information: a) all the data needed to identify the laboratory sample tested; b) confirmation that the test was carried out in accordance with this standard; c) any deviation from
16、this standard; and d) the maximum impact, in joules, withstood before failure occurred. SANS 5790:2008 Edition 2 3 Figure 1(a) Impact strength test apparatus SANS 5790:2008 Edition 2 4 Figure 1(b) Impact strength test apparatus Key to figures 1(a) and (b) 1. Vertical pillar 2. Base plate 3. Upright
17、casting 4. V-block 5. Ring 6. Pendulum pivot 7. 170 g hammer 8. 90 g hammer 9. Steel tape (0,25 mm thick) 10. Rod 11. Brass coller 12. Rod holder screw X. Dial for 90 g hammer Y. Dial for the 170 g hammer SANS 5790:2008 Edition 2 5 Figure 2 Position of cup in impact strength test apparatus Figure 3 Position of saucers and plates in impact strength test apparatus Standards South Africa
