1、BRITISH STANDARD CONFIRMED JANUARY 1982 BS 131-1: 1961 Incorporating Amendment Nos. 1 and 2 Methods for Notched bar tests Part 1: The izod impact test on metals UDC 620.178.746BS131-1:1961 This British Standard, having been approved by the MechanicalEngineering Industry Standards Committee and endor
2、sed by the Chairman of theEngineering Divisional Council, was publishedunder theauthority ofthe GeneralCouncil on 30thMay,1961 BSI 03-1999 First published August, 1920 First revision, August, 1933 Second revision, May, 1961 The following BSI references relate to the work on this standard: Committee
3、reference ISM/NFM/4 Draft for comment A(MEE)9391 ISBN 0 580 00761 8 Co-operating organizations The Mechanical Engineering Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific and
4、 industrial organizations: Admiralty* Gas Council Air Ministry High Commission of India Associated Offices Technical Committee Institute of Marine Engineers Association of Consulting Engineers Institute of Petroleum (Incorporated) Institution of Civil Engineers British Chemical Plant Manufacturers I
5、nstitution of Gas Engineers Association Institution of Heating and Ventilating British Compressed Air Society Engineers British Electrical and Allied Manufacturers Institution of Mechanical Engineers* Association* Institution of Mechanical Engineers British Engineers Association (Automobile Division
6、) British Gear Manufacturers Association Institution of Production Engineers* British Internal Combustion Engine Locomotive and Allied Manufacturers Manufacturers Association Association of Great Britain British Iron and Steel Federation* Machine Tool Trades Association British Railways, the British
7、 Transport Ministry of Labour (Factory Inspectorate) Commission Ministry of Power Crown Agents for Oversea Governments and Ministry of Transport Administrations Ministry of Works D.S.I.R.National Engineering Laboratory* National Coal Board Electricity Council, The Generating Board National Physical
8、Laboratory (D.S.I.R.)* and the Area Boards in England and Wales Radio Industry Council Engineering Equipment Users Association War Office* The Government departments and scientific and industrial organizations marked with an asterisk in the above list, together with the following, were directly repr
9、esented on the Committee entrusted with the preparation of this standard: Alloy Steels Association Council of British Manufacturers of Aluminium Development Association Petroleum Equipment Aluminium Industry Council D.S.I.R.Building Research Station Association of British Chemical D.S.I.R.Forest Pro
10、ducts Laboratory Manufacturers Institute of Welding British Cast Iron Research Association Institution of Engineering Inspection British Constructional Steelwork Association Lloyds Register of Shipping British Iron and Steel Research Association Ministry of Aviation British Non-ferrous Metals Resear
11、ch Testing Houses Association Testing Machine Manufacturers and British Welding Research Association Individual Firms Amendments issued since publication Amd. No. Date Comments (PD 4651) September 1962 5069 March 1986 Indicated by a sideline in the marginBS131-1:1961 BSI 03-1999 i Contents Page Co-o
12、perating organizations Inside front cover Foreword ii 1 Scope 1 2 Form and dimensions of test piece 1 3 Preparation of test piece 1 4 Testing machine 1 5 Striking energy 1 6 Test requirements 10 7 Testing Temperature 10 8 Presentation of results 10 Appendix A Installation of the testing machine 12 A
13、ppendix B Curved notch circular section test piece 12 Appendix C Rectangular section subsidiary test pieces 16 Figure 1 Single notch square section test piece 3 Figure 2 Two notch square section test piece 3 Figure 3 Three notch square section test piece 4 Figure 4 Enlarged section of notch for squa
14、re section test pieces 5 Figure 5 Single notch circular section test piece 7 Figure 6 Two notch circular section test piece 7 Figure 7 Three notch circular section test piece 8 Figure 8 Enlarged section of notch for circular section test pieces 9 Figure 9 Sketch showing angle and radius of striker,
15、and inclination of striker to horizontal for cantilever type test piece (elevation) 11 Figure 10 Sketch showing local increase in width of locating groove for square section test pieces 11 Figure 11 Single curved notch circular section test piece 13 Figure 12 Two curved notch circular section test p
16、iece 13 Figure 13 Three curved notch circular section test piece 14 Figure 14 Enlarged section of curved notch for circular section test piece 15 Table 1 Dimensions and tolerances of ferrous and non-ferrous square section test pieces 2 Table 2 Dimensions and tolerances of ferrous and non-ferrous cir
17、cular section test pieces 6 Table 3 Dimensions and tolerances of ferrous and non-ferrous curved notch circular section test pieces 12 Table 4 Dimensions and tolerances of ferrous and non-ferrous rectangular section subsidiary test pieces 16BS131-1:1961 ii BSI 03-1999 Foreword In order to keep abreas
18、t of progress in the industries concerned, BritishStandards are subject to periodical review. Suggestions for improvements will be recorded and in due course brought to the notice of the committees charged with the revision of the standards to which they refer. A complete list of British Standards,
19、numbering over 9,000, fully indexed and with a note of the contents of each, will be found in the BSI Catalogue which may be purchased from BSI Sales Department. The Catalogue may be consulted in many public libraries and similar institutions. This standard makes reference to the following British S
20、tandard: BS 131-2, Charpy V-notch impact test on metals. This British Standard which states the requirements for the Izod Impact Test on metals is published as Part1 of a revision of BS131. Part 2 previously published gives the requirements for the Charpy V-notch test. The work of Technical Committe
21、e17, “Steel”, of the International Organization for Standardization (ISO) has been taken into account in preparing the standard and the square section and circular section straight notch test pieces are in accordance with ISO Recommendation R84. The scope has also been widened to include details of
22、the method of test together with structural and dimensional requirements for testing machines. Dimensions with appropriate machining tolerances are given for standard10mm square section and standard circular section test pieces. The use of the curved notch circular section test piece is not preferre
23、d, but at the request of the steel industry the form and dimensions of this test piece are given in an Appendix. After due consideration of the requirements of certain sections of industry for subsidiary test pieces of cross-section smaller than10mm 10mm, it has been decided to omit the two given in
24、 the1933 revision of the standard, and to introduce in an appendix two new subsidiary test pieces having dimensions of10mm 7.5mm and10mm 5mm with the notch cut in a narrow face. These are intended for use only when it is impossible to obtain a standard test piece from the material available. It shou
25、ld be noted that no trustworthy relationship has been found between the energies absorbed in breaking test pieces of different sizes and only results of test pieces of identical dimensions should be compared. In this standard no reference is made to the number of tests required for particular applic
26、ations as this is regarded as part of the specification for the material. It should also be noted that no reliable relationship has been found between different types of impact test, and conversions from Izod impact test results to Charpy-V-notch or Charpy U-notch values are not recommended. A Briti
27、sh Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front
28、 cover, an inside front cover, pagesi andii, pages1 to16 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on theinside front cover.BS131-1:1961 BSI 03-1999 1 1 Scope This British Standard spe
29、cifies the conditions for carrying out the Izod impact test on metals. The test consists of measuring the energy absorbed in breaking a notched test piece by one blow from a striker carried by a pendulum. The test piece is gripped vertically with the root of the notch in the same plane as the upper
30、face of the grips. The blow is struck on the same face as the notch and at a fixed height above it. 2 Form and dimensions of test piece The standard test pieces shall have dimensions and tolerances in accordance withTable 1 orTable 2 and shall conform to the appropriate figures as follows: a) Test p
31、ieces with square section (10mm 10mm). Figure 1 With single notch. Figure 2 With two notches. Figure 3 With three notches. b) Test pieces with circular section (0.45 inch diameter). Figure 5 With single straight notch. Figure 6 With two straight notches. Figure 7 With three straight notches. Where m
32、ore than one notch is cut in a test piece the notches shall be spaced as shown inTable 1 or Table 2. The notches shall be cut around the test pieces as shown inFigure 2, Figure 3, Figure 6 and Figure 7 unless otherwise required by the material specification. The plane of symmetry of the notch shall
33、be perpendicular to the longitudinal axis of the test piece, i.e.the direction of the notch shall be at right angles to the longitudinal axis of the test piece and the plane of symmetry of the notch shall be at right angles to the face in which it is cut. Dimensions and tolerances for curved notch c
34、ircular section test pieces are given inAppendix B, and those for rectangular section subsidiary test pieces inAppendix C. 3 Preparation of test piece The schedule of operations for producing a test piece will in general be a matter for the specification of the material being tested. Details of the
35、notches are given inFigure 4 andFigure 8. Unless a particular method of preparing the notch is specified in the standard for the material, it may be cut by any machining method provided that a smooth contour of the specified form is produced. Attention is drawn to the fact that the impact properties
36、 of some materials are affected by the method employed. 4 Testing machine The testing machine shall be constructed and installed steady and rigid (seeAppendix A). The following conditions shall be satisfied (seeFigure 9) The plane of swing of the striker shall be vertical. The machine shall be so co
37、nstructed that the loss of energy (such as from translation, rotation or vibration) in the machine framework during a test is negligible. The radius of the centre of percussion about the axis of rotation shall be equal to the radius of the striker about this axis within a tolerance of 1 per cent. 5
38、Striking energy In general a machine of120ftlb (16.6kgm) capacity will be found adequate for most materials. Smaller machines of20ftlb or60ftlb(2.76or8.3kgm) will provide better discrimination with materials of very low energy absorption. When recording the energy absorbed the capacity of the machin
39、e shall also be indicated (seeClause8). Distance between plane of symmetry of notch and line of contact between test piece and striker 2200.5mm Angle at tip of striker 75 1 Radius at tip of striker 0.51.0 mm Angle between face of test piece and under-side face of striker 100 1 Speed of striker at in
40、stant of impact 3 4 m/s (9.813.1ft/s)BS131-1:1961 2 BSI 03-1999 Table 1 Dimensions and tolerances of ferrous and non-ferrous square section test pieces Item Nominal dimensions Machining tolerances Ferrous test pieces Non-ferrous test pieces Minimum overall length of test piece: 1 Notch 2 Notch 3 Not
41、ch Millimetre 70 98 126 Inch equivalents 2.76 3.86 4.96 Millimetre Inch equivalents Millimetre Inch equivalents Width 10 0.394 0.10 0.004 0.05 0.002 Thickness 10 0.394 0.10 0.004 0.05 0.002 Root radius ofnotch 0.25 0.010 0.025 0.001 0.025 0.001 Depth below notch measured at both ends 8 0.315 0.10 0.
42、004 0.025 0.001 Distance of plane of symmetry of notch from free end of test piece and from adjacent notch 28 1.1 0.41 0.016 0.41 0.016 Angle of notch 45 2 1BS 131-1:1961 BSI 03-1999 3 Figure 1 Single notch square section test piece Figure 2 Two notch square section test piece Dimensions are in mill
43、imetres unless otherwise stated.BS 131-1:1961 4 BSI 03-1999 Figure 3 Three notch square section test piece Dimensions are in millimetres unless otherwise statedBS 131-1:1961 BSI 03-1999 5 Figure 4 Enlarged section of notch for square section test pieces Dimensions are in millimetres unless otherwise
44、 statedBS131-1:1961 6 BSI 03-1999 Table 2 Dimensions and tolerances of ferrous and non-ferrous circular section test pieces Item Nominal dimensions Machining tolerances Ferrous test pieces Non-ferrous test pieces Minimum overall length of test piece: 1 Notch 2 Notch 3 Notch Inch 2.8 3.9 5.0 Millimet
45、re equivalents 71 99 127 Inch Millimetre equivalents Inch Millimetre equivalents Diameter 0.45 11.43 0.001 0.025 0.001 0.025 Root radius of notch 0.010 0.25 0.001 0.025 0.001 0.025 Depth below notch 0.32 8.13 0.004 0.10 0.002 0.05 Distance of plane of symmetry of notch from free end of test piece an
46、d from adjacent notch 1.1 28 0.02 0.5 0.02 0.5 Angle of notch 45 2 1BS 131-1:1961 BSI 03-1999 7 Figure 5 Single notch circular section test piece Figure 6 Two notch circular section test piece Dimensions are in inches unless otherwise stated.BS 131-1:1961 8 BSI 03-1999 Figure 7 Three notch circular
47、section test piece Dimensions are in inches unless otherwise statedBS 131-1:1961 BSI 03-1999 9 Figure 8 Enlarged section of notch for circular section test pieces Dimensions are in inches unless otherwise statedBS131-1:1961 10 BSI 03-1999 6 Test requirements The test piece shall be supported behind
48、the notch by a rigid support block having a vertical groove to locate the test piece in the plane of swing of the pendulum. The groove shall accept test pieces having tolerances specified inTable 1, Table 2, Table 3 or Table 4. In the case of square specimens the groove shall be increased in width l
49、ocally to18.5mm as shown inFigure 10 to allow flow of the material to occur in a direction normal to the plane of swing of the pendulum. The top edge of the support about which bending takes place shall be slightly rounded. The test piece shall be rigidly clamped on the face containing the notch by a clamp block, and shall be so positioned that the plane
