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1、J IS JAPANESE I N DU STR I AL STANDARD Translated and Published by Japanese Standards Association JIS B 77401999 Charpy pendulum impact test - Reference test pieces for verification of testing machines ICs 77.040.10 Descriptors : charpy impact tests, test equipment, test specimens Reference number :
2、 JIS B 7740 : 1999 (E) PROTECTED BY COPYRIGHT 8s Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 03:47:24 MDTNo reproduction or networking permitted without license from IHS -,-,- B 7740 :
3、1999 Foreword This translation has been made based on the original Japanese Industrial Standard revised by the Minister of International Trade and Industry through deliberations at the Japanese Industrial Standards Committee in accordance with the Industrial Standardization Law. Consequently JIS B 7
4、740:1990 is replaced with JIS B 7740:1999. Date of Establishment: 1990-02-01 Date of Revision: 1999-03-20 Date of Public Notice in Official Gazette: 1999-03-23 Investigated by: Japanese Industrial Standards Committee Divisional Council on Precision Machinery JIS E) 7740 : 1999, Second English editio
5、n published in 2003-12 Translated and published by: Japanese Standards Association 4-1-24, Akasaka, Minato-ku, Tokyo, 107-8440 JAPAN In the event of any doubts arising as to the contents, the original JIS is to be the final authority. O JSA2003 All rights reserved. Unless otherwise specified, no par
6、t of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. Printed in Japan PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under li
7、cense with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 03:47:24 MDTNo reproduction or networking permitted without license from IHS -,-,- JAPANESE INDUSTRIAL STANDARD J X S B 7740 : 1999 Charpy pendulum impact test - Reference test pieces for verification of te
8、sting machines Introduction This Japanese Industrial Standard has been prepared based on ISO/ FDIS 148-3, Metallic materials - Charpy pendulum impact test - Bart 3: Prepara- tion and characterization of Charpy V reference test pieces for verification of testing machines published in 1994 without mod
9、ifying the technical contents. The portions with dotted underlines in this Standard are the matters not included in the original International Standard. 1 Scope This Standard covers the requirements, preparation and methods of quali- fying test pieces that are used to indirectly verify pendulum impa
10、ct testing machines for Charpy impact test in accordance with JIS B 7722 and with the certificate for reference test pieces. It describes notched test pieces with nominal dimensions identical to those speci- fied in JIS Z 2202. However, the tolerances are more stringent. The chemical composition or
11、heat treatment or both are varied according to the energy level de- sired. Reference test pieces are qualified on reference pendulum impact machines which are also described in this document. Remarks: The International Standard corresponding to this Standard is as follows: ISO#DIS 148-3 Metallic mat
12、erials - Charpy pendulum impact test - Part 3: Preparation and characterization of Charpy V reference test pieces for verification of testing machines 2 Normative references The following standards contain provisions which, through reference in this Standard, constitute provisions of this Standard.
13、The most recent editions of the standards indicated below shall be applied. JIS B 7722 Charpy pendulum impact test - Verification of testing machines Remarks: ISOLFDIS 148-2: 1994 Metallic materials - Charpy pendulum impact test - Part 2: Verification of testing machines is identical with the _ _ _
14、_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - * - - - - - - - - - - - - - - - - - - - - - - . - - - - - - - - - - - - - - - - - - - - - said standard. JIS Z 2202 Test pieces for impact test for metallic materials JIS Z 224
15、2 Remarks: IS0 83:1976 Steel - Charpy impact test (U-notch), IS0 148:1983 Steel - Charpy impact test (V-notch) is identical with the said stan- dard. Method of impact test for metallic materials ._-.- . - - - - - - - . PROTECTED BY COFYRIGHT Copyright Japanese Standards Association Provided by IHS u
16、nder license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 03:47:24 MDTNo reproduction or networking permitted without license from IHS -,-,- 2 B 7740 : 1999 3 Definitions For the purposes of this Standard, the following definitions apply. 3.1 industrial mac
17、hine Pendulum impact testing machine used for industrial, general or research laboratory testing of metallic materials. These machines are not used to establish reference values. 3.2 reference machine Pendulum impact testing machine used to determine the reference energy of a reference test piece. T
18、he verification requirements for this grade of machine are more stringent than those for industrial machines (see table 2). 3.3 Definitions pertaining to energy 3.3.1 actual absorbed energy (absorbed energy), Av The total energy required to break a test piece when tested by a pendulum impact testing
19、 machine. It is equal to the difference in the potential energy from the starting position of the pendulum to the end of the first half-swing during which the test piece is broken. 3.3.2 indicated absorbed energy (indicated energy), As The energy value in- dicated by the pointer or other readout dev
20、ice of a pendulum impact testing machine. 3.3.3 reference energy, A R The absorbed energy associated with reference test pieces, determined from tests made using reference machines. It is the mean value of the set tested (see also clause 6). 3.4 lot A definite quantity of reference test pieces manuf
21、actured under identical conditions of production. 3.5 reference test piece An impact test piece used to verify the suitability of an industrial pendulum impact testing machine by comparing the indicated energy mea- sured by that machine to the reference energy associated with the test piece. 3.6 cer
22、tified reference test piece An impact test piece used to verify reference machines by comparing the impact energy measured by that machine to the certified reference value associated with the test piece. Note: The certified reference value is the value determined by a national or in- ternational bod
23、y following an intercomparison exercise carried out on a group of reference machines within its jurisdiction. 3.7 set A group of test pieces chosen at random from a lot. 3.7.1 characterization set A set of test pieces taken from a lot in accordance with clause 6 and used to determine the reference e
24、nergy of the lot. 3.7.2 reference set A set of test pieces chosen in accordance with clauses 6 and 8 used to verify a pendulum impact testing machine. 3.8 Definitions pertaining to the test piece (placed in the test position on the supports of the machine) 3.8.1 height The distance between the notch
25、ed face and the opposite face. PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 03:47:24 MDTNo reproduction or networking permitted without license from IHS -,-,- 3 B
26、7740 : 1999 Symbol Av A S A R 3 . 8 . 2 width The dimension perpendicular to the height and parallel to the notch. 3.8.3 length 4 Symbols and designations The symbols and designations used in this Stan- dard are as indicated in tables 1 and 2 and attached figures 1 and 2. The largest dimension at ri
27、ght angles to the notch. Table 1 Symbols and their meanings Unit Meaning J J J Actual absorbed energy; absorbed energy Indicated absorbed energy; indicated energy Reference energy of a set of Charpy reference test pieces 5 Reference test machine 5.1 Characteristics The characteristics of reference m
28、achines used to determine the reference energy of reference test pieces shall comply with the requirements of JIS B 7722 except as modified below: 5.1.1 Geometrical characteristics (see table 2 and attached figures 1 and 2) The radius of curvature of the anvils shall be (l+t:;*) mm. The angle betwee
29、n the anvil and the support shall be 90“ * 0.10“. The distance between the anvils shall be (40t:i) mm. The striking edge shall remain within 0.25 mm of the plane of“ symmetry of the anvils. The striker shall conform to the geometry specified in JIS B 7722 for either the 2 mm or the 8 mm striker. PRO
30、TECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 03:47:24 MDTNo reproduction or networking permitted without license from IHS -,-,- 4 B 7740 : 1999 Table 2 Geometrical ch
31、aracteristics (see attached figures 1 and 2) Tumber 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15A 15B 15C 15D Designation Length of test piece Half-length of test piece Height of test piece Width of test piece Ligament length Angle of notch Radius of curvature of base of notch Angle between adjacent faces An
32、gle between plane of symmetry of notch and longitudinal axis Radius of anvils Angle of taper of anvils Distance between anvils Distance of striking edge from plane of symmetry of anvils Angle of striker Radius of curvature of striking edge of 2 mm striker Radius of curvature of striking edge of 8 mm
33、 striker Radius of shoulder of 8 mm striker Width of striking edge of 8 mm striker Size 55.00 27.5 10.00 10.00 8.00 45 0.250 90 90 1 11 40.0 - 30 2 to 2.5 8.0 0.2 to 1.0 4.0 _ Tolerance O -0.30 f0.20 f0.06 k0.075 f0.06 f1 f0.025 fO.l f2 +0.1 O fl +0.1 0.0 f0.25 f1 f0.05 k0.05 Notes 1 The radius at t
34、he base of the notch shall be tangential to the notch angle. The surface finish shall not exceed 1.6 mm on the notched surface or 3.2 mm on the other surfaces. Identification marks shall not be placed in any area of the test piece that contacts the striker edge, anvils or test piece supports, or wit
35、hin 5 mm of the notch. 2 3 5 . 1 . 2 Capacity The capacity of a reference machine shall be 300 J or greater. 5 . 1 . 3 Hardness The portions of the striker and the anvils (see attached figure 1) which contact the specimen and apply or react to the impacting force shall have a minimum hardness of 56
36、HRC. 5 . 1 . 4 Vibration Ensure that the reference machine is not subjected to external (random) vibrations induced by other equipment in close proximity, such as forging hammers, presses, moving vehicles. Such vibrations can be detected by placing a small container of water at any convenient locati
37、on on the machine framework; the absence of ripples on the water surface indicates that this requirement is met. Note: 5.1.5 Energy-indicating mechanism The resolution shall be at least 1/400th of the nominal energy. PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS und
38、er license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 03:47:24 MDTNo reproduction or networking permitted without license from IHS -,-,- 5 B 7740 : 1999 5.2 Qualification of reference test machine Direct verification shall be car- ried out in accordance w
39、ith JIS B 7722 and with the additional requirements of 5.1. Indirect verification shall be carried out using certified reference test pieces, The repeatability and the error shall be as specified in table 3. Table 3 Repeatability and error of reference pendulum impact machines Unit: J Energy E m al
40、i 3 n 3 al 8 m 3 3 I? 5 C h c . l Y 3 al a m o rl Y PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 03:47:24 MDTNo reproduction or networking permitted without licens
41、e from IHS -,-,- &ata for JIS (English edition) are printed in Standardization Jouml, published monthly by the Japanese Standards Association, and also provided to subscribers of J?S (English edition) in Monthly Information. Errata will be provided upon request, please contact: Standardization Promo
42、tion Department, Japanese Standards Association 4-1-24, Akasaka, Minato-ku, Tokyo, 107-8440 JAPAN TEL. 03-3583-8002 FAX. 03-3583-0462 100% Recycled paper PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 03:47:24 MDTNo reproduction or networking permitted without license from IHS -,-,-