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1、J IS JAPANESE I NDUSTR IAL STANDARD Translated and Published by Japanese Standards Association Toughness test of link chains- Impact test method of chain links ICs 53.020.30 Reference number : JIS B 8841 : 2004 (E) PROTECTED BY COPYRIGHT 11 s Copyright Japanese Standards Association Provided by IHS
2、under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 07:54:36 MDTNo reproduction or networking permitted without license from IHS -,-,- B 8841 : 2004 Foreword This translation has been made based on the original Japanese Industrial Standard establishe
3、d by the Minister of Economy, Trade and Industry through deliberations at the Japanese Industrial Standards Committee in accordance with the Industrial Standardization Law. Attention is drawn to the possibility that some parts of this Standard may conflict with a patent right, application for a pate
4、nt after opening to the public, utility model right or application for registration of utility model after opening to the public which have technical properties. The relevant Minister and the Japanese Industrial Standards Committee are not responsible for identifying the patent right, application fo
5、r a patent after opening to the public, utility model right or application for registration of utility model after opening to the public which have the said technical properties. Date of Establishment: 2004-11-20 Date of Public Notice in Official Gazette: 2004-11-22 Investigated by: Japanese Industr
6、ial Standards Committee Standards Board Technical Committee on Logistics and Distribution of Goods JIS B 8841 :2004, First English edition published in 2005-04 Translated and published by: Japanese Standards Association 4-1-24, Akasaka, Minato-ku, Tokyo, 107-8440 JAPAhT In the event of any doubts ar
7、ising as to the contents, the original JIS is to be the final authority. O SA 2005 All rights reserved. No part 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 publis
8、her. Printed in Japan AT PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 07:54:36 MDTNo reproduction or networking permitted without license from IHS -,-,- B 8841 : 2
9、004 Contents Page Introduction . 1 2 3 4 5 6 6.1 6.2 6.3 6.4 7 Scope Normative references Definitions J-shaped test piece Testing machine . Test Test temperature . Fixing method of J-shaped test piece How to obtain absorbed energy E (J) to be required for breaking How to obtain impact value of chain
10、 link . J-shaped test piece Record Annex 1 (normative) Impact testing machine of chain link 1 1 1 1 2 4 4 4 4 5 6 6 9 (i) PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2
11、007 07:54:36 MDTNo reproduction or networking permitted without license from IHS -,-,- JAPANESE INDUSTRIAL STANDARD JIS B 8841 : 2004 Toughness test of link chains- Impact test method of chain links Introduction This Japanese Industrial Standard specifies the toughness test method for evaluating the
12、 safety, materials, low-temperature performance of link chains. In addition, this Standard does not have the corresponding International Stan- dard. 1 referred to as “test method”) for the toughness test of link chains. Scope Remarks : This Standard specifies the impact test method of chain links (h
13、ereafter The chain link impact testing machine is specified in annex 1. 2 Normative references The following standards contain provisions which, through reference in this Standard, constitute provisions of this Standard. The most recent editions (including amendments) indicated below shall be applie
14、d. JIS B 0148 Lifting equipments-Terminology JIS 3 8812 Link chain for chain hoists JIS G 0202 Glossary of terms used in iron and steel (testing) JIS Z 2242 Method of impact test for metallic materials 3 Definitions 0148 and JIS G 0202 and the following definitions apply. For the purposes of this St
15、andard, the definitions given in JIS B chain link each link which constitutes a link chain J-shaped test piece from link chains into a J shape wire diameter of J-shaped test piece (d) portion of a chain link (see figure i) chain link impact testing machine pact test of a chain link rated capacity en
16、ergy (AN) testing machine absorbed energy of J-shaped test piece (E) energy required for breaking a J-shaped test piece in performing the test impact value of chain link (T,) the value calculated according to the follow- ing formula from the absorbed energy (E) of a J-shaped test piece obtained by p
17、erforming the test a test piece prepared by forming the chain link sampled the wire diameter of the parallel the testing machine used for the im- energy designated by the manufacturer of the (1) E d3 T, = - where, T, : impact value of chain link (J/mm3) E : absorbed energy of J-shaped test piece (J)
18、 PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 07:54:36 MDTNo reproduction or networking permitted without license from IHS -,-,- 2 B 8841 : 2004 d : wire diameter
19、of J-shaped test piece (actual mea- surement value) (mm) h) distance between test-piece support and impact point (h) the distance between the top surface of test-piece support and the blade edge when the blade edge comes in contact with the J-shaped test piece at the impact point (see fig- ure 1 and
20、 figure 3) impact point the point where the blade edge of the pendulum(1) hung freely comes in contact with the J-shaped test piece fixed at the test-piece support (see figure 3) Note (1) Locate the blade edge at the lowest point of the pendulum. i) 4 J-shaped test piece a) The J-shaped test piece t
21、o be used shall be sampled from link chains(2) used as a product. The shape of the J-shaped test piece shall be as shown in figure 1. The dimen- sions shall be as given in table 1. b) Table 1 Dimensions of J-shaped test piece Items Distance between the test-piece support and the impact point (h) Dep
22、th of V notch (a) Angle of V notch (a) Radius at the edge of V notch (r) Distance between the apex of chain link and the edge of V notch (b) Dimensions 1.13d k0.3 (mm) 0.25M I 0.05 (mm) 4512 (“1 0.25 t 0.025 (mm) 2.ld t 0.1 (mm) c) The V notch and the impact point shall be located at the parallel po
23、rtion of a chain link. Note (2) For example, the link chain which conforms to JIS B 8812. Remarks 1 The J-shaped test piece shall be prepared by removing the weld of a link chain. 2 Do not overheat the J-shaped test piece when preparing it. PROTECTED BY COPYRIGHT Copyright Japanese Standards Associa
24、tion Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 07:54:36 MDTNo reproduction or networking permitted without license from IHS -,-,- Impact force - Cross-section A-A Cross-section B-B Apex Figure 1 J-shaped test piece 3 B 8841
25、: 2004 V notch PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 07:54:36 MDTNo reproduction or networking permitted without license from IHS -,-,- 4 B 8841 : 2004 5 Te
26、sting machine The testing machine shall be in accordance with annex 1. 6 Test The test shall be performed as follows (see figure 1 to figure 3). 6.1 Test temperature a) The test shall be performed at the test temperature (T) specified in the product standard. When the test temperature (27 is a low t
27、emperature of O O C or lower, the J-shaped test piece shall be cooled in the liquid tank or in the gas tank, or the J-shaped test piece or the support shall be cooled with the J-shaped test piece fixed to the support. The tolerance on the test temperature shall be T+ 2 OC. The retention time of the
28、J-shaped test piece at the test temperature shall be 5 min for the liquid tank or 30 min for the gas tank. Furthermore, it shall be 10 min when the J- shaped test piece and the support are together cooled. Information : The test temperature of the J-shaped test piece should be con- firmed just befor
29、e the test. b) c) 6.2 Fixing method of J-shaped test piece The J-shaped test piece shall be prop- erly fixed to the test-piece support so that the distance (h) between the test-piece support and the impact point specified in table 1 is satisfied. The support surface of the J-shaped test piece shall
30、be perpendicular to the direction of movement of the pendulum, and the J-shaped test piece shall be fixed between the support surface and the opposite parallel surface. Furthermore, the impact portion of the J-shaped test piece shall be fixed so that it is located in the centre of the hammer (see fi
31、g- ure 2 and figure 3). Remarks : The J-shaped test piece shall be fixed to the test-piece support so that the position of blade edge when the pendulum reaches the lowest point becomes the impact point. PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license wit
32、h JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 07:54:36 MDTNo reproduction or networking permitted without license from IHS -,-,- 5 B 8841 : 2004 Figure 2 Impact test of chain link I Blade Support surface of J-shaped test piece Figure 3 Support and J-shaped test
33、 piece 6.3 How to obtain absorbed energy E (JI to be required for breaking J-shaped test piece Absorbed energy E (JI to be required for breaking a J-shaped test piece shall be calculated according to the following formulae. . E = &f(cosfi - cosa) - L (J) (2) M = W,? (Nm) (3) PROTECTED BY COPYRIGHT C
34、opyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 07:54:36 MDTNo reproduction or networking permitted without license from IHS -,-,- 6 B 8841 : 2004 where, M : moment of pendulum around rotati
35、on axis (Nm) W : force by mass of pendulum measured at the blade edge (NI I : distance between the centre of rotation axis and the blade edge (m) a : angle of lift of a pendulum (O) p : angle of rise of a pendulum (O) L : the correction value(3) of energy lost during motion of a pendulum (JI Note (3
36、) The value (p +p) obtained by adding energy loss (p) due to friction of roller bearing of rotation axis of a pendulum and air resistance to energy loss (p) due to friction of a friction pointer shall be treated as the cor- rection value (L) of energy lost during motion of a pendulum. Absorbed energ
37、y (E) of a J-shaped test piece shall be corrected with the correc- tion value of energy lost during motion of a pendulum (see clause 13 of annex 1). 6.4 a) b) Cl How to obtain impact value of chain link The impact value of a chain link T, (J/mm3) shall be calculated according to the formula (1). The
38、 impact value of a chain link shall be obtained as the average value of the test result when the number of test piece (n) is 3. However, the case when the J-shaped test piece is not broken is not included in the average value. Further- more, when two or more test pieces are not broken, the re-test s
39、hall be per- formed. The transition curve and transition temperature shall be obtained in accordance with JIS G 0202 and JIS Z 2242. 7 Record The item to record shall be as follows: a) Kind of link chains b) c) Grade and/or type of link chains Nominal wire diameter, (actually measured wire diameter)
40、 x pitch d, (d) x P (mm) d) Test temperature T ( O C ) e) Absorbed energy E (JI f) g) h) Test site and examiner Impact value of chain link T, (J/mm3) Year, month and day of test Information : The examples of the transition curve of impact value of chain link are shown in informative figure 1 and inf
41、ormative figure 2. PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 07:54:36 MDTNo reproduction or networking permitted without license from IHS -,-,- 7 B 8841 : 2004
42、Kind and gradeltype Wire diameter x pitch (mm) Material h (mm) a (mm) Year, month and day of test Test site Examiner Load chain VH 7.2 x 21.0 Mn-B steel 8.2 1.83 XXXX.XX.XX xxx xxx 0.1 7 0.1 6 0.1 5 0.1 4 0.1 3 0.12 J 0.1 e 0.09 0.08 ci 0.07 2 0.06 E 0.05 0.04 0 . 0 3 0.02 0.0 1 E 0.1 1 + a Test tem
43、perature ( O C ) Impact value, T, ( J/m3) Average of impact value I l I l I I I 20 O -120 -100 -80 -60 - 40 - 20 O - 100 - 80 0.043 7 0.126 9 (16.31) (47.37) 0.041 5 0.125 5 (15.49) (46.84) 0.048 9 0.132 4 (18.25) (49.42) 0.044 7 0.128 3 (16.68) (47.88) Test temperature, O C Transition curve of impa
44、ct value of chain link - 60 0.133 6 (49.87) 0.121 2 (45.24) 0.132 3 (49.38) 0.129 O (48.16) - 40 0.126 7 (47.29) 0.135 O (50.39) 0.132 3 (49.38) 0.131 3 (49.02) - 20 0.131 6 (49.12) 0.129 4 (48.30) 0.137 7 (51.40) 0.132 9 (49.61) O 0.128 1 (47.81) 0.135 7 (50.65) 0.137 O (5 I . 13) 0.133 6 (49.86) 4
45、0 0.131 6 (49.12) 0.137 7 (5 1.40) 0.126 7 Remarks : The values in parentheses indicate absorbed energy E (J) of J-shaped test piece. Informative figure 1 Example of transition curve of impact value of chain link (load chain VH) PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provide
46、d by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 07:54:36 MDTNo reproduction or networking permitted without license from IHS -,-,- 8 B 8841 : 2004 0.01 Sample number-x x x x . Kind and gradeltype Wire diameter x pitch (mm) Material h (mm
47、) a (mm) Year, month and day of test Test site Examiner - 100 0.021 9 (8.52) 0.019 4 (7.53) 0.022 9 (8.91) 0.021 4 (8.32) Load chain, grade Ttype DAT 7.3 x 21.1 Mn-Ni-Mo steel 8.46 1.85 xxxx.xx.xx xxx xxx - 80 - 60 0.028 9 0.038 4 (11.26) (14.94) 0.029 9 0.036 9 (11.65) (14.35) 0.028 5 0.038 4 (11.0
48、7) (14.94) 0.029 1 0.037 9 (11.33) (14.74) - 40 0.041 4 (16.11) 0.041 9 (16.30) 0.0384 (14.94) 0.0406 (15.78) Transition curve of impact value of chain link - 20 O 0.103 O 0.105 7 (40.07) (41.12) 0.099 8 O. 11 1 O (38.82) (43.18) 0.101 1 0.103 O (39.33) (40.07) 0.101 3 0.106 6 (39.41) (41.46) Test temperature (OC) Impact value, T, ( J/mm3) Average of impact value 20 0.095 2 (37.03) 0.090 6 (35.24) 0.098 4 (38.28) 0.094 7 (36.85) Remarks : The