1、AN AMERICAN NATIONAL STANDARD ASME B29.26-2013(Revision of ASME B29.26-2001)Fatigue Testing Power Transmission Roller ChainASME B29.26-2013(Revision of ASME B29.26-2001)Fatigue TestingPower TransmissionRoller ChainAN AMERICAN NATIONAL STANDARDTwo Park Avenue New York, NY 10016 USADate of Issuance: N
2、ovember 20, 2013This Standard will be revised when the Society approves the issuance of a new edition.ASME issues written replies to inquiries concerning interpretations of technical aspects of thisStandard. Periodically certain actions of the ASME B29 Committee may be published as Cases.Cases and i
3、nterpretations are published on the ASME Web site under the Committee Pages athttp:/cstools.asme.org/ as they are issued.Errata to codes and standards may be posted on the ASME Web site under the Committee Pages toprovide corrections to incorrectly published items, or to correct typographical or gra
4、mmatical errorsin codes and standards. Such errata shall be used on the date posted.The Committee Pages can be found at http:/cstools.asme.org/. There is an option available toautomatically receive an e-mail notification when errata are posted to a particular code or standard.This option can be foun
5、d on the appropriate Committee Page after selecting “Errata” in the “PublicationInformation” section.ASME is the registered trademark of The American Society of Mechanical Engineers.This code or standard was developed under procedures accredited as meeting the criteria for American NationalStandards
6、. The Standards Committee that approved the code or standard was balanced to assure that individuals fromcompetent and concerned interests have had an opportunity to participate. The proposed code or standard was madeavailable for public review and comment that provides an opportunity for additional
7、 public input from industry, academia,regulatory agencies, and the public-at-large.ASME does not “approve,” “rate,” or “endorse” any item, construction, proprietary device, or activity.ASME does not take any position with respect to the validity of any patent rights asserted in connection with anyit
8、ems mentioned in this document, and does not undertake to insure anyone utilizing a standard against liability forinfringement of any applicable letters patent, nor assumes any such liability. Users of a code or standard are expresslyadvised that determination of the validity of any such patent righ
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10、se interpretations of this document issued in accordance with the establishedASME procedures and policies, which precludes the issuance of interpretations by individuals.No part of this document may be reproduced in any form,in an electronic retrieval system or otherwise,without the prior written pe
11、rmission of the publisher.The American Society of Mechanical EngineersTwo Park Avenue, New York, NY 10016-5990Copyright 2013 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword ivCommittee Roster . vCorrespondence With the B29 Committee vi1 Scope . 12 P
12、urpose . 13 Definitions and Nomenclature. 14 References 15 Testing Equipment . 26 Test Chains 27 Test Loads. 58 Testing Procedures . 59 Analyzing Fatigue Testing Data . 710 Presentation of Test Results 8Figures1 Typical Load Cycle . 32 Typical Single-Strand Roller Chain Fatigue Test Specimens andFix
13、tures 33 Typical Double-Strand Roller Chain Fatigue Test Specimens andFixtures 44 Typical Leaf Chain Fatigue Test Specimens and Fixtures . 45 Typical Fatigue Test Fixtures for Endless Chain Tested on Sprockets orSheaves 56 Johnson-Goodman Diagram . 67 Staircase Data Plot 88 Typical Fatigue Test Data
14、 Plot . 10Table1 Required Number of Data Points 7Nonmandatory AppendicesA Survival Method With Abridged Probit Analysis 11B Additional “Phantom” Data Points 14C Adding One Step to the Minimum Fatigue Strength . 15D Adjusting Laboratory Fatigue Strength for Applications . 16iiiFOREWORDThe current hor
15、sepower ratings for precision power transmission roller chains, to ANSI B29.1,were first published in 1961. The low-speed portion of those ratings was derived from axialfatigue rating data provided by the member companies of the American Chain Association(then the ASCME). Each company determined a c
16、hains fatigue rating a different way, but thesedifferences were not critical because the horsepower ratings were set at a very conservative level.In 1982, ISO began work on a motorcycle chain standard that included dynamic (fatigue)strength requirements. Furthermore, ISO decided that the development
17、 of these dynamic strengthrequirements for the motorcycle chain standard would set a precedent for including dynamicstrength requirements in other chain standards.During the review of the proposed motorcycle chain standard, this committee found thatseveral different test procedures and analysis meth
18、ods were in use that could produce significantlydifferent fatigue strength results for the same chain test sample. It seemed obvious that a uniformtesting and analysis procedure was needed, so the committee initiated work on this Standard.That edition of ASME B29.26M was approved by the American Nat
19、ional Standards Institute onDecember 9, 1996.The 2001 revision of B29.26 incorporated several improvements. A conformance test was addedto evaluate a chains conformance to dynamic strength requirements in related B29 productstandards. The number of tests in a staircase was revised to require more te
20、sts for four or fivelevel staircases. An appendix was added to describe the use of a Probit analysis for setting stepsize, and an appendix was added to give a method for adjusting a chains fatigue strength froma short test specimen (five pitches) to a longer drive chain (100 pitches).This revision i
21、ncorporates new specimen drawings and a revised section on step size to coverthe testing of multiple strand roller and leaf chains. It also corrects two editorial errors from the2001 edition.Suggestions for improvement of this Standard are welcome. They should be sent to the Secretary,B29 Committee,
22、 The American Society of Mechanical Engineers, Two Park Avenue, New York,NY 10016-5990.This revision was approved as an American National Standard on October 3, 2013.ivASME B29 COMMITTEEChains, Attachments, and Sprocketsfor Power Transmission and Conveying(The following is the roster of the Committe
23、e at the time of approval of this Standard.)STANDARDS COMMITTEE OFFICERSC. G. Springman, ChairC. J. Gomez, SecretarySTANDARDS COMMITTEE PERSONNELA. J. Binford, IWIS Drive SystemsR. Brandon, Alternate, Diamond Chain Co.L. Carrier, ConsultantD. W. Egbert, Hitachi Maxco, Ltd.D. G. Fannin, Emerson Power
24、 TransmissionC. J. Gomez, The American Society of Mechanical EngineersW. C. Hall, Ramsey Products Corp.D. B. Holcomb, Alternate, Ramsey Products Corp.M. Manickam, Webster Industries, Inc.vC. A. Norwood, Martin Sprocket however, they shouldnot contain proprietary names or information.Requests that ar
25、e not in this format may be rewritten in the appropriate format by the Committeeprior to being answered, which may inadvertently change the intent of the original request.ASME procedures provide for reconsideration of any interpretation when or if additionalinformation that might affect an interpret
26、ation is available. Further, persons aggrieved by aninterpretation may appeal to the cognizant ASME Committee or Subcommittee. ASME does not“approve,” “certify,” “rate,” or “endorse” any item, construction, proprietary device, or activity.Attending Committee Meetings. The B29 Standards Committee reg
27、ularly holds meetings thatare open to the public. Persons wishing to attend any meeting should contact the Secretary ofthe B29 Standards Committee.viASME B29.26-2013FATIGUE TESTINGPOWER TRANSMISSION ROLLER CHAIN1 SCOPEThis Standard covers fatigue testing, in axial tension,of power transmission rolle
28、r chains in ASME B29.1 andASME B29.100 and nonstandard variants of those chains.2 PURPOSEThe purpose of this Standard is to provide a uniform,reliable method of determining the fatigue strength ofpower transmission roller chains so that equivalent andcomparable results can be obtained from axial fat
29、iguetesting at different laboratories.3 DEFINITIONS AND NOMENCLATUREamplitude, load (Fa): one-half the difference between themaximum load and the minimum load, measured inpounds force (newtons).cycles (N): the number of load cycles, at a single load,applied to a specimen chain at a particular time i
30、nthe test.cycles to failure (Nf): the number of load cycles sustainedby the specimen chain at the time of failure.cycles to failure, average (Na): the calculated mean numberof cycles to failure, at a single load, for a test series.cycles to failure, minimum (Nm): the calculated minimumnumber of cycl
31、es to failure, at a single load, for a testseries, with 0.977 probability of survival based on a log-normal distribution. Also known as endurance limit.endurance (Ne): the predetermined number of cycles atwhich a test will be discontinued without failure of thespecimen chain.failure (X): separation,
32、 or significant elongation atreduced load, of the specimen chain resulting fromfatigue fracture of a link plate (normal) or a pin (uncom-mon) before endurance. The letter X is used to designatea failure when plotting test data.fatigue limit (Fd): the test load, corrected to zero minorload, at which
33、there is a calculated 0.135% probabilityof failure at 107load cycles, measured in pounds force(newtons). This approximates the load below which achain may endure an infinite number of load cycles.fatigue strength, average (Fb): the calculated averagefatigue strength of a test lot, at 107load cycles,
34、 corrected1to zero minor load, measured in pounds force (newtons).If endurance is not 107, note the number of load cyclesat endurance.fatigue strength, minimum (Fe): the test load, corrected tozero minor load, at which there is a calculated 0.135%probability of failure at an endurance less than 107,
35、 mea-sured in pounds force (newtons). Note the number ofload cycles at endurance.load, major (Fmax): the maximum value of load in the loadcycle, measured in pounds force (newtons).load, mean (Fm): one-half the sum of the maximum andminimum loads in the load cycle, measured in poundsforce (newtons).l
36、oad, minor (Fmin): the minimum value of load in the loadcycle, measured in pounds force (newtons).load, test (Fr): the major load, corrected to zero minorload, at which a test series was run, measured in poundsforce (newtons).run-out (O): the specimen chain runs to endurance with-out failure. The le
37、tter O is used to designate a run-outwhen plotting test data.staircase test: in this Standard, a method of testing forroller chain fatigue strength in which the specimens aretested at predetermined equally spaced load levels. Thetests then are arranged such that if the previous testfails before endu
38、rance, the next test is at the next lowerload level, and if the previous test survives to endurance(runs-out), the next test is at the next higher load level.The resulting data plot resembles a staircase.step (d): the difference between two adjacent test loadlevels in a staircase fatigue test, measu
39、red in poundsforce (newtons).tensile strength, chain, minimum (Fu): the minimum loadat which unused, undamaged chains may be expectedto fail when subjected to a single tensile load application,measured in pounds force (newtons).4 REFERENCESThe following is a list of publications referenced in thisSt
40、andard. Unless otherwise specified, the standard(s)referenced shall be the most recent issue at the time oforder placement.ASME B29.26-2013ASME B29.1, Precision Power Transmission RollerChains, Attachments, and SprocketsASME B29.100, Double-Pitch Roller Chains,Attachments, and SprocketsASME B29.24,
41、Roller Load Chains for Overhead HoistsPublisher: The American Society of MechanicalEngineers (ASME), Two Park Avenue, New York,NY 10016-5990; Order Department: 22 Law Drive, P.O.Box 2900, Fairfield, NJ 07007-2900 (www.asme.org)ASTM E4, Practices for Force Verification of TestingMachinesASTM E467, Pr
42、actice for Verification of ConstantAmplitude Dynamic Forces in an Axial FatigueTesting MachinePublisher: American Society for Testing and Materials(ASTM International), 100 Barr Harbor Drive, P.O.Box C700, West Conshohocken, PA 19428-2959(www.astm.org)5 TESTING EQUIPMENT5.1 Testing Machine Type and
43、Size5.1.1 Machine Type. The tests may be conductedon any one of the following types of fatigue testingmachines: mechanical (eccentric crank, rotating mass,resonant spring, etc.), electromechanical, magnetic,hydraulic, or electrohydraulic.5.1.2 Machine Size. The size of the testing machineshall be su
44、ch that the maximum test load on the testchain shall be equal to or greater than 10% of the maxi-mum capacity of the machine.5.2 Load Application5.2.1 Load Form. The load shall be in axial tensionthroughout the test.The machine shall apply a mean load; then cyclicallyvary the axial tension load, app
45、roximately sinusoidallywith time, above and below the mean load betweenpredetermined minor and major loads; and then repeat(see Fig. 1).5.2.2 Loading Frequency. The loading frequencyshall not induce a damaging temperature rise in the testspecimen. Loading frequencies of up to 200 Hz usuallyare satis
46、factory.5.3 Load Calibration and Verification5.3.1 Machine Calibration. The testing machineshall be calibrated periodically to maintain suitableaccuracy of load application. The machine should becalibrated to within 2% of its maximum capacity. Themachine should be calibrated in accordance withASTM E
47、4.25.3.2 Load Verification(a) The action of the test machine shall be analyzed toensure that the desired form and magnitude of loading isapplied.(b) A load-monitoring system should be mounted inseries with the specimen to ensure that the load cycleis maintained throughout the test.(c) The varying lo
48、ad, determined by suitable dynamicmeasuring means, should be maintained at all times towithin 2% of the operating range of the machine beingused. Loads should be verified in accordance withASTM E467.5.4 Additional Machine RequirementsThe testing machine shall have(a) a counter to record the number o
49、f load cycles(b) a device to stop the machine when the chain fails(c) a device to prevent the machine from restartingafter an emergency stop due to power failure, etc.5.5 Test Fixtures5.5.1 Flexibility. Test fixtures shall permit freemovement of the test chain in both the normal planeof articulation and in the plane perpendicular to that.Typical test fixture arrangements are shown in Figs. 2through 5.5.5.2 Axial Loading. The load should be appliedalong the chains centerline. Avoid misalignment causedby twist or lateral displacement of the fixtures.5.5.3 Connection. When terminal c
