《AS 1544-2-2003 Methods for impact tests on metals - Charpy V-notch.pdf》由会员分享，可在线阅读，更多相关《AS 1544-2-2003 Methods for impact tests on metals - Charpy V-notch.pdf（24页珍藏版）》请在三一文库上搜索。
1、 AS 1544.22003 Australian Standard Method for impact tests on metals Part 2: Charpy V-notch AS 1544.2 Licensed to Colin M. Lorrimar MTS Met on 22 May 2007. 1 user personal user licence only. Storage, distribution or use on network prohibited. This Australian Standard was prepared by Committee MT-006
2、, Mechanical Testing of Metals. It was approved on behalf of the Council of Standards Australia on 15 August 2003 and published on 19 September 2003. The following are represented on Committee MT-006: Australasian Railway Association Australasian Aluminium Council Australian Industry Group Bureau of
3、 Steel Manufacturers of Australia CSIRO Measurement Laboratory CSIRO Telecommunications and Industry Physics Institute of Materials Engineering Australasia Keeping Standards up-to-date Standards are living documents which reflect progress in science, technology and systems. To maintain their currenc
4、y, all Standards are periodically reviewed, and new editions are published. Between editions, amendments may be issued. Standards may also be withdrawn. It is important that readers assure themselves they are using a current Standard, which should include any amendments which may have been published
5、 since the Standard was purchased. Detailed information about Standards can be found by visiting the Standards Australia web site at .au and looking up the relevant Standard in the on-line catalogue. Alternatively, the printed Catalogue provides information current at 1 January each year, and the mo
6、nthly magazine, The Global Standard, has a full listing of revisions and amendments published each month. We also welcome suggestions for improvement in our Standards, and especially encourage readers to notify us immediately of any apparent inaccuracies or ambiguities. Contact us via email at .au,
7、or write to the Chief Executive, Standards Australia International Ltd, GPO Box 5420, Sydney, NSW 2001. This Standard was issued in draft form for comment as DR 03087. Licensed to Colin M. Lorrimar MTS Met on 22 May 2007. 1 user personal user licence only. Storage, distribution or use on network pro
8、hibited. The Standard is downloaded from Standard Sharing AS 1544.22003 Australian Standard Method for impact tests on metals Part 2: Charpy V-notch Originated as AS B188.21962. Previous edition AS 1544.21989. Third edition 2003. COPYRIGHT Standards Australia International All rights are reserved.
9、No part of this work may be reproduced or copied in any form or by any means, electronic or mechanical, including photocopying, without the written permission of the publisher. Published by Standards Australia International Ltd GPO Box 5420, Sydney, NSW 2001, Australia ISBN 0 7337 5042 7 Licensed to
10、 Colin M. Lorrimar MTS Met on 22 May 2007. 1 user personal user licence only. Storage, distribution or use on network prohibited. AS 1544.22003 2 PREFACE This Standard was prepared by the Standards Australia Committee MT-006, Mechanical Testing of Metals, to supersede AS 1544.21989, Methods for impa
11、ct tests on metals, Part 2: Charpy V-notch. The objective of this Standard is to specify a method for testing toughness in metals by impact testing. This Standard is Method 2 of a series of Standards on the methods for impact testing of metals. The series comprises the following methods: AS 1544 Met
12、hod for impact tests on metals 1544.1 Part 1: Izod 1544.2 Part 2: Charpy V-notch 1544.3 Part 3: Charpy U-notch and keyhole notch 1544.4 Part 4: Calibration of the test machine 1544.5 Part 5: Assessment of fracture surfaces appearance of steel Research indicates that significant differences in absorb
13、ed energy are obtained using machines fitted with 2 mm radius strikers and 8 mm radius strikers at absorbed energy values exceeding 100 joules. The term normative has been used in this Standard to define the application of the appendix to which it applies. A normative appendix is an integral part of
14、 a Standard. Licensed to Colin M. Lorrimar MTS Met on 22 May 2007. 1 user personal user licence only. Storage, distribution or use on network prohibited. The Standard is downloaded from Standard Sharing 3 AS 1544.22003 CONTENTS Page FOREWORD4 1 SCOPE5 2 REFERENCED DOCUMENTS5 3 DEFINITIONS5 4 TESTIN
15、G MACHINE.6 5 TEST PIECE.9 6 PROCEDURE.11 7 REPORT.13 APPENDICES A INSTALLATION, CALIBRATION AND MAINTENANCE OF THE TESTING MACHINE .14 B RECORD OF TEST RESULTS.17 Licensed to Colin M. Lorrimar MTS Met on 22 May 2007. 1 user personal user licence only. Storage, distribution or use on network prohibi
16、ted. AS 1544.22003 4 FOREWORD The Charpy V-notch Impact Test is a pendulum-type single-blow impact test in which the test piece, V-notched in the middle and supported at both ends as a simple beam, is broken by a falling pendulum which strikes the test piece opposite the notch. The energy absorbed i
17、s determined from the subsequent rise of the pendulum. The satisfactory operation of a pendulum impact testing machine is dependent on factors which include the design, the foundation, the accuracy of construction of machine components, the degree of wear, and the friction-free movement of the pendu
18、lum. During a test, all the absorbed energy indicated by the machine is attributed to the fracturing of the test piece. However, it is known that there are other mechanisms by which small amounts of energy may be absorbed. It is suspected that items such as test piece supports, the machine foundatio
19、n and frame work, the pendulum and striker, ejection and drag of the broken test piece cause some degree of energy absorption. This energy is not determined, as suitable methods and apparatus have not yet been developed for measuring energy absorption by these individual items. Licensed to Colin M.
20、Lorrimar MTS Met on 22 May 2007. 1 user personal user licence only. Storage, distribution or use on network prohibited. The Standard is downloaded from Standard Sharing 5 AS 1544.22003 .au Standards Australia STANDARDS AUSTRALIA Australian Standard Method for impact tests on metals Part 2: Charpy V
21、-notch 1 SCOPE This Standard specifies the conditions for performing the Charpy V-notch impact test on metals. It also includes requirements for the installation of the testing machine, its initial and periodic calibration, and recommendations for its maintenance by the user. 2 REFERENCED DOCUMENTS
22、The following documents below are referred to in this Standard: AS 1544 Method for impact tests on metals 1544.4 Part 4: Calibration of the testing machine 1544.5 Part 5: Assessment of fracture surface appearance of steel ISO 148 SteelCharpy impact test (V-notch) ASTM E23 Methods for notched bar imp
23、act testing of metallic materials 3 DEFINITIONS For the purpose of this Standard, the definitions below apply. 3.1 Centre of percussion That point in a pendulum at which a blow, delivered in a tangential direction, will cause no reaction at the centre of rotation. 3.2 Initial potential energy The en
24、ergy theoretically available in a pendulum-type impact testing machine when the pendulum is returned from its striking position to its initial release position. 3.3 Length of pendulum The distance from the axis of rotation of the pendulum to the impact point of the pendulum, on a standard test piece
25、. 3.4 Point of impact The midpoint of the line of contact between the striking edge and the test piece. 3.5 Sample A portion of material or a group of items selected from a batch or consignment by a sampling procedure. 3.6 Secondary standard test pieces Charpy test pieces having an assigned impact v
26、alue obtained from tests performed upon a verified testing machine. Licensed to Colin M. Lorrimar MTS Met on 22 May 2007. 1 user personal user licence only. Storage, distribution or use on network prohibited. AS 1544.22003 6 Standards Australia .au 3.7 Standardized test pieces Charpy test pieces fro
27、m a nationally recognized source which have certified impact values for testing machine verification purposes. 3.8 Striking energy The kinetic energy of the pendulum of the testing machine at the instant of impact. 3.9 Striking velocity The linear velocity of the striking edge at the instant of impa
28、ct. 3.10 Test piece A prepared piece for testing, made from a test specimen by some mechanical operation. 3.11 Test specimen A portion of material, or a single item taken from the sample, for the purpose of applying a particular test. 3.12 Verification Proving of calibration procedures by testing of
29、 standardized test pieces. 4 TESTING MACHINE 4.1 General The testing machine shall be of the pendulum type, and shall be so constructed that the loss of energy (such as from translation, rotation or vibration) in the machine framework and pendulum during a test, is negligible (see ISO 148). Under ce
30、rtain circumstances, charpy machines meeting the requirements of ASTM E23 shall be deemed to comply with this Standard. Machines that have been calibrated to ASTM E23 may be used for testing with this Standard provided that the minimum specified energy is equal to or less than 100 joules. NOTE: Mach
31、ines complying with this Standard and that have been calibrated to AS 1544.4 do not meet the requirements of ASTM E23. 4.2 Installation, calibration and maintenance The machine shall be installed and calibrated in accordance with Paragraphs A1 and A2 of Appendix A. It shall be recalibrated periodica
32、lly, and when otherwise necessary, in accordance with Paragraph A2 of Appendix A. The machine should be maintained in satisfactory working order and condition in the intervals between successive recalibrations, in accordance with Paragraph A3 of Appendix A. 4.3 Test piece supports The test piece sup
33、ports consist of two mutually perpendicular surfaces extending on each side of, and normal to, the plane of swing of the pendulum. Essentially, one of these divided surfaces supports the weight of the test piece and the other takes the reaction from the impact blow on the test piece. The correspondi
34、ng parts of the divided surfaces are coplanar. The level of the supports shall be such that the longitudinal axis of a supported test piece is parallel within 2:1000 to the reference surface of the machine. The supports shall be of hardened steel. They shall be attached rigidly to the frame of the m
35、achine and shall satisfy the following conditions (see Figure 1): (a) Distance between supports 40 +0.5,0 mm. (b) Radius of curvature 1.0 mm to 1.5 mm. Licensed to Colin M. Lorrimar MTS Met on 22 May 2007. 1 user personal user licence only. Storage, distribution or use on network prohibited. The Sta
36、ndard is downloaded from Standard Sharing 7 AS 1544.22003 .au Standards Australia (c) Taper of supports (see Note 1)1 0.1 in 5. (d) Angle of supports (see Note 2) . 90 0.1 degrees. NOTES: 1 Machines manufactured with supports having an included angle of 78 degrees to 80 degrees are acceptable. 2 A
37、relieving recess is provided at the junction of the two support surfaces. 4.4 Striker The striker and its components shall comply with the following requirements: (a) The striker shall be of hardened steel. (b) The striker shall be attached rigidly to the pendulum and shall satisfy the following con
38、ditions (see Figure 1): (i) Included angle of striker.30 1 degrees. (ii) Radius of curvature of striking edge .2.0 mm to 2.5 mm. (iii) Maximum width of striker.18 mm. NOTE: The maximum width requirement applies to any part of the pendulum which passes between the supports for a distance of 7.5 mm fr
39、om the centre of a supported standard test piece in a direction parallel to the striking edge. For reasons outlined in Clause 4.5, widths less than 18 mm are desirable to ensure that adequate clearance can be maintained. (c) The striking edge shall be rounded with a smooth profile blending with the
40、faces of the striker. (d) The plane of swing of the striking edge shall be within 0.5 mm of the centre of the gap between the supports. It shall also be vertical and normal to the supports. (e) When the striking edge is 10 mm away from the plane of the reaction surface of the supports, it shall be p
41、arallel within 0.03 mm in 10 mm to this plane. (f) When the striking edge makes contact with the test piece, the line of contact shall be perpendicular within 2 degrees to the longitudinal axis of the test piece. In addition, the striker shall be symmetrical about the plane of the swing of the strik
42、ing edge. 4.5 Test piece clearance The requirements for the geometry of the test piece, test piece supports and striker at the instant of impact are such as to ensure clearance between the striker, the broken halves of the test piece and the supports, during the test. However, this clearance can be
43、lost as a result of asymmetry of the striker or a change in alignment of the pendulum. The clearance between the supports and striker, or any adjacent part of the pendulum which passes between the supports, shall be not less than 10.5 mm. The broken test piece should be free to leave the machine wit
44、h the minimum of interference, and should not rebound into the pendulum. Any end stop used for locating the test piece in the supports shall be retracted in order that it does not impede the movement of the test piece during the test. NOTE: Clearance of 13 mm should be used to ensure the specimen do
45、es not interfere with the striker. 4.6 Centre of percussion The distance of the centre of percussion from the axis of rotation shall be equal to the length of the pendulum, 1 percent. Licensed to Colin M. Lorrimar MTS Met on 22 May 2007. 1 user personal user licence only. Storage, distribution or us
46、e on network prohibited. AS 1544.22003 8 Standards Australia .au 4.7 Striking velocity The striking velocity shall be 4.5 to 7.0 m/s. In the case of a dispute 5 to 5.5 m/s shall be used. 4.8 Indicating equipment For scales graduated in joules, the scale intervals shall not exceed 1 J for machines ha
47、ving a striking energy of 160 J or less, or 2 J for machines having a striking energy greater than 160 J. DIMENSIONS IN MILLIMETRES FIGURE 1 ARRANGEMENT OF SUPPORTS, TEST PIECE AND STRIKER For scales graduated in other units, the scale intervals shall not exceed 1 percent of the maximum scale value.
48、 The thickness of the scale marks and the width of the tip of the pointer shall not exceed one fifth of the minimum scale spacing. The pointer should permit a reading free from parallax error. The length of the smallest scale mark should not be less than 2.5 mm. 4.9 Zero reading When the machine is
49、operated normally but without a test piece in position, the reading indicated by the pointer is the zero reading. This reading shall not exceed 0.5 percent of the nominal initial potential energy (see Paragraph A3.4 of Appendix A). 4.10 Friction losses Energy is absorbed by friction, including air resistance, bearing friction and friction of the pointer. The total losses by