2013_2021.pdf

AN AM E R IC AN NAT IO NAL STANDARD ASME B29.26-2013(Revision of ASME B29.26-2001)Fatigue Testing Power Transmission Roller ChainREAFFIRMED 2021ASME 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:November 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 interpretations 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 grammatical 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.ThisoptioncanbefoundontheappropriateCommitteePageafterselecting“Errata”inthe“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.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 forpublic review andcomment thatprovides an opportunityfor additional publicinput 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 anyitems 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 rights,and the risk of infringement of such rights,isentirely their own responsibility.Participation by federal agency representative(s)or person(s)affiliated with industry is not to be interpreted asgovernment or industry endorsement of this code or standard.ASME accepts responsibility for only those 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 permission 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.vi1Scope.12Purpose.13Definitions and Nomenclature.14References.15Testing Equipment.26Test Chains.27Test Loads.58Testing Procedures.59Analyzing Fatigue Testing Data.710Presentation of Test Results.8Figures1Typical Load Cycle.32Typical Single-Strand Roller Chain Fatigue Test Specimens andFixtures.33Typical Double-Strand Roller Chain Fatigue Test Specimens andFixtures.44Typical Leaf Chain Fatigue Test Specimens and Fixtures.45Typical Fatigue Test Fixtures for Endless Chain Tested on Sprockets orSheaves.56Johnson-Goodman Diagram.67Staircase Data Plot.88Typical Fatigue Test Data Plot.10Table1Required Number of Data Points.7Nonmandatory AppendicesASurvival Method With Abridged Probit Analysis.11BAdditional“Phantom”Data Points.14CAdding One Step to the Minimum Fatigue Strength.15DAdjusting Laboratory Fatigue Strength for Applications.16iiiFOREWORDThe current horsepower 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 chains 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 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 thatseveraldifferent testproceduresand analys