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1、STD-JIS B LOBI-ENGL 1997 4933b08 05b4270 705 J IS JAPANESE I N DU STR AL STANDARD Translated and Published by Japanese Standards Association Threaded fasteners- Axial load fatigue testing- Test methods and evaluation of results ICs 21.040.01 Descriptors : threads, threaded fasteners, fatigue testing
2、, tensile testing Reference number : JIS B 1081 : 1997 (E) 13 S Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 05/16/2007 00:53:04 MDTNo reproduction or networking permitted without license from IHS
3、-,-,- STDoJIS 8 3083-ENGL 3997 B 1081 : 1997 (IS0 3800 : 1993) Foreword m 4933608 0564293 641 This translation has been made based on the original Japanese Industrial Standard revised by the Minister of International Trade and Industry through deliberations at Japanese Industrial Standards Committee
4、 in accordance with the Industrial Standardization Law. Consequently JIS B 1081 : 1991 is replaced with JIS B 1081 : 1997. Date of Establishment: 1986-02-01 Date of Revision: 1997-01-20 Date of Public Notice in Official Gazette: 1997-01-20 Investigated by: Japanese Industrial Standards Committee Div
5、isional Council on Machine Elements JIS B 1081 : 1997, First English edition published in 2000-07 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 a
6、uthority. O JSA2000 All rights reserved. Unless otherwise specified, 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 publisher. Printed in Japan Copyright Jap
7、anese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 05/16/2007 00:53:04 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-JIS B 1081-ENGL 1777 4933608 05b4272 588 JAPANESE INDUSTRIAL STANDA
8、RD JI$ B 1081 : 1997 (IS0 3800 : 1993) Threaded fasteners- Axial load fatigue testing- Test methods and evaluation of results Introduction This Japanese Industrial Standard has been prepared based on IS0 3800, Threaded fasteners-Axial load fatigue testing-Test methods and evaluation ofresults issued
9、 in 1993 as the first edition without changing the technical contents. The “Remarks” and “Informative references” underlined with dots in this Stan- dard are the matters not included in the original International Standard. 1 Scope This Japanese Industrial Standard specifies the conditions for carryi
10、ng out axial load fatigue tests on threaded fasteners, as well as recommendations for the evaluation of the results. Unless otherwise agreed, the tests are of the fluctuating tension type and are car- ried out at room temperature, the loading applied being centric along the longitudi- nal axis of th
11、e fastener. The influence of the compliance of clamped parts on the strain of the fastener is not taken into account. This method allows determination of the fatigue strength of threaded fasteners. The test results can be influenced by the test conditions. For this reason, mini- mum requirements are
12、 specified to reduce this effect. In addition, calibration and centering control methods for the testing apparatus are included. Remarks : The International Standard corresponding to this Standard is as follows. IS0 3800 : 1993 Threaded fasteners-Axial _._._._ load fatigue _._ _._._ testing-Test _._
13、. methods and evaluation of results _._._ _._-.-.-.-.-. _-._._. 2 Normative references The following standards contain provisions which, through reference in this Standard, constitute provisions of this Standard. The most recent editions of the standards indicated below shall be applied. JIS B 1001
14、Remarks : _._._._. JIS B 1005 Remarks : JIS B 1181 Remarks : -_._.-_ Diameter of clearance holes and counterbores for bolts and screws The provisions cited from IS0 273 : 1979, Fasteners-Clearance holes for bolts and screws are equivalent to the corresponding provisions in the said standard. ._._ .
15、_l_. _._._. _ _._. Radii under the head for external threaded fasteners Hexagon nuts and hexagon thin nuts The provisions cited from IS0 4032 : 1986, Hexagon nuts, style 1-Prod- uct grades A and B, IS0 4033 : 1979 Hexagon nuts style 2-Product grades A and B, IS0 8673 : 1988 Hexagon nuts style 1, wit
16、h metric nepitch thread- roduct grades A and B and IS0 8674 - 1988 Hexa- gonrz-n-uts, style 2, with metric fine pitch thread-Product grades A and B, are equivalent to the corresponding provisions in the said standard. _._._. _. _._._._. - - - . . - - - - - . - . - - - . - - - - - -_. . -. . . . . .
17、. - -. . . . - . . . . . . . . . . . . . . . - - - . . ? . -. . . . . . . . . . . - - - . . - - - - . -. -? . - - -. . . . . - . . -. . _. . . . ._._ ._._ _ ._._._ _._._._ ._._._ 2 ._._-.- ._. 2- ._ _. _._._ ._._ ._._._ fi -_. _._._._._-.-. -.? -. .- -._._ _._._-.-.- _._ ._ I _._ 2 ._ _. _. _._ . _.
18、_._. ._._._ _._. _._._._._. _._ . . Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 05/16/2007 00:53:04 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-JIS B 1081-ENGL 19
19、97 4933b08 0Cb4293 414 = 2 B 1081 : 1997 (IS0 3800 : 1993) 3 Symbols and their designations Standard shall be as shown in Table 1. The symbols and their designations in this Symbol A s d di d2 da da D FA F U I H N NO P Pf Table 1 Symbols and their designations Designation Area at nominal minor diame
20、ter, a e.g. Oa or logN. Informative reference : The standard values specified in JIS B 1051 Mechanical proper- ties of steel bolts and screws are generally applied to Rm.2 and R , , , . -.-_._-_-_-_ _.-_-_-.- _-_ _-_. ._-_. c . Copyright Japanese Standards Association Provided by IHS under license w
21、ith JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 05/16/2007 00:53:04 MDTNo reproduction or networking permitted without license from IHS -,-,- 3 B 1081 : 1997 (IS0 3800 : 1993) 4 Principle Tests are made on threaded fasteners to determine fatigue proper- ties such as those
22、 shown by SIN curve (the Whler curve). Threaded fasteners to be tested are mounted in an axial load fatigue testing ma- chine and subjected to fluctuating tension type loading. Tests with constant mean stress Om or constant stress ratio R, = Omin/omax may be used. Constant mean stress is used genera
23、lly to determine infinite life see case (c) Constant stress ratio is generally for quality acceptance testing see case (a) in Fig. 101. The test is continued until the test piece fails, or until a predetermined number of stress cycles has been exceeded. Generally the number of test cycles is deter-
24、mined by the material or by the endurance fatigue strength of the test specimen. Unless otherwise specified, the definition of failure is complete separation of the fastener into two parts. e in Fig. 101. 5 Apparatus 5.1 Testing machine The testing machine shall be capable of maintaining the loads a
25、utomatically to within I 2 % of the required values throughout the test and shall be equipped with a device for counting and recording the total number of cycles per test. The testing machine shall be calibrated periodically to ensure this accu- racy. The frequency range of testing shall be between
26、4.2 Hz and 250 Hz. The test- ing machine shall induce a sinusoidal fluctuation in load in the test piece. The testing machine shall have a device to prevent its automatic restarting after stopping due to electrical power service interruption. 5.2 Test fixtures The test fixtures shall be capable of t
27、ransmitting an axial load to the test piece. Figs. 1 and 2 give basic requirements. Self-aligning devices are not recommended (see 5.3). Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 05/16/2007 00:5
28、3:04 MDTNo reproduction or networking permitted without license from IHS -,-,- STDeJIS B LOB minimum hardness, 5 points HRC greater than that of the test part. . . Fig. 1 Fixture (without insert) . Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/
29、1111111001, User=Wing, Bernie Not for Resale, 05/16/2007 00:53:04 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-JIS B 1081-ENGL 1997 4933608 0564296 123 m 5 B 1081 : 1997 (IS0 3800 : 1993) Perpendicularity and concentricity tolerances in millimetres, surface roughness
30、 in micrometres 36 HRC to 40 HRC Counterbore (optional) dh is in accordance with JIS B 1001, Grade 1. d. is in accordance with JIS B 1005, Transition diameter (max.), column 1. Notes (1) The use of an insert shall not affect the rigidity of the test fixture. (2) Surface may be case-hardened 0.25 mm
31、to 0.5 mm deep: maximum hardness, HRC 60; minimum hardness, 5 points HRC greater than that of the test part. Fig. 2 Fixture (with insert) 5.3 Test alignment Periodically, the alignment of the test set-up shall be veri- fied. This shall be determined by using a load verification stud (see Fig. 3) wit
32、h four strain gauges located at 90“ on a common centerline around the axis. The length of the parallel part of the load verification stud shall be four times its diameter. When measured at 50 % of the load range used on the machine, the difference be- tween the maximum stress O,+ a, and the nominal
33、tensile stress o , , shall not ex- ceed 6 % of the nominal tensile stress (see Fig. 4). Self-aligning devices are not recommended. If they are used, alignment shall be checked carefully since any eccentric loading may cause fatigue test results to vary widely. 5.4 Internally threaded component For f
34、atigue testing of standard products, the appropriate size and property class of nut in accordance with the text of JIS B 1181 or a threaded adapter shall be used. The text of JIS B 1181 is equivalent to IS0 4032, IS0 Informative reference : Copyright Japanese Standards Association Provided by IHS un
35、der license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 05/16/2007 00:53:04 MDTNo reproduction or networking permitted without license from IHS -,-,- STDSJIS B LOBI-ENGL 1997 4933608 OS64297 ObT 6 B 1081 : 1997 (IS0 3800 : 1993) If special bolt-nut combinations are t
36、ested, a precise description of the nut shall If threaded adapters according to Fig. 5 are used, they shall be described in ac- be given as specified in 8.2. cordance with 8.2. Cylindricity, perpendicularity and concentricity tolerances in millimetres, surface roughness i n micrometres -.- Notes (1)
37、 The tolerance class of the screw thread shall be 4h. (2) d, =CE Fig. 3 Load verification stud F t Parae part of load verification bar 4F Fig. 4 Stress distribution in the shank of the load verification stud Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS
38、Employees/1111111001, User=Wing, Bernie Not for Resale, 05/16/2007 00:53:04 MDTNo reproduction or networking permitted without license from IHS -,-,- * STD=JIS B 1081-ENGL 1997 4933b08 05b4298 TTb 7 B 1081 : 1997 (IS0 3800 : 1993) Flatness, perpendicularity and concentricity tolerances in miliimetre
39、s ,-36HRC to40HRC 10.03 A a bolt length of at least 2P shall protrude beyond the test nut (see Fig. 7). Test nuts shall be used once only. Threaded test adapters may be used continually as long as they assemble freely on the externally threaded part each time and no damage has been observed. I Fig.
40、6 Test washer (assembled) Fig. 7 Location of test nut Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 05/16/2007 00:53:04 MDTNo reproduction or networking permitted without license from IHS -,-,- STDm
41、JIS B 1081-ENGL I1997 4933608 0564299 932 8 B 1081 : 1997 (IS0 3800 : 1993) The specimen shall be assembled freely in the fixture without binding or forcing. No torsional stress shall be induced in the assembly by torquing the nut; i.e. the load shall be induced in the assembly by the testing machin
42、e. The threaded fastener and test nut shall be thoroughly cleaned and then coated with SAE 20 oil or equivalent prior to testing. The test frequency shall be selected so that the temperature of the test specimen does not rise more than 50 O C during the test period. The temperature should be measure
43、d at the first engaged thread. At frequent intervals throughout the test period, the load shall be monitored to ascertain that the load conditions have not changed. Results of fatigue tests are affected by atmospheric conditions. Therefore, if pos- sible, atmospheric conditions, particularly humidit
44、y, should be checked in accordance with 2.2 of JIS Z 8703. The content of this clause is equivalent to 2 . 1 of IS0 554. Informative reference : . - - - - - - - 7 Evaluation of results A comparative assessment of fatigue strength values is only possible when the tests and the evaluation of results a
45、re carried out in a uni- form manner. Fatigue strength values can be determined in the finite life range (failure of all test pieces before a predetermined number of stress cycles is reached) and in the transition range where, up to the predetermined number of stress cycles (in general 5 x 106 to 1
46、x 1 0 7 stress cycles), failures as well as non-failures will occur (see Fig. 10). As a function of the test objective, the fatigue tests are carried out and evaluated according to two methods: a) a minimum number of stress cycles is reached at a predetermined stress ampli- tude in the finite life r
47、ange and transition range, respectively; b) the position and size of scatter of the finite life range and transition range, re- spectively, are determined using statistical evaluation methods. 7.1 Tests in the finite life range The test in the finite life range is the test for obtaining the finite fatigue life data of threaded fasteners and is generally