ASTM_D_3479_-_D_3479M_-_19.pdf

Designation:D3479/D3479M19Standard Test Method forTension-Tension Fatigue of Polymer Matrix CompositeMaterials1This standard is issued under the fixed designation D3479/D3479M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This test method determines the fatigue behavior ofpolymer matrix composite materials subjected to tensile cyclicloading.The composite material forms are limited tocontinuous-fiber or discontinuous-fiber reinforced compositesfor which the elastic properties are specially orthotropic withrespect to the test direction.This test method is limited tounnotched test specimens subjected to constant amplitudeuniaxial in-plane loading where the loading is defined in termsof a test control parameter.1.2 This test method presents two procedures where eachdefines a different test control parameter.1.2.1 Procedure AA system in which the test controlparameter is the load(stress)and the machine is controlled sothat the test specimen is subjected to repetitive constantamplitude load cycles.In this procedure,the test controlparameter may be described using either engineering stress orapplied load as a constant amplitude fatigue variable.1.2.2 Procedure BA system in which the test controlparameter is the strain in the loading direction and the machineis controlled so that the test specimen is subjected to repetitiveconstant amplitude strain cycles.In this procedure,the testcontrol parameter may be described using engineering strain inthe loading direction as a constant amplitude fatigue variable.1.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system are not necessarily exact equivalents;therefore,toensure conformance with the standard,each system shall beused independently of the other,and values from the twosystems shall not be combined.1.3.1 Within the text the inch-pound units are shown inbrackets.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D883 Terminology Relating to PlasticsD3039/D3039M Test Method for Tensile Properties of Poly-mer Matrix Composite MaterialsD3878 Terminology for Composite MaterialsD5229/D5229M Test Method for MoistureAbsorption Prop-erties and Equilibrium Conditioning of Polymer MatrixComposite MaterialsE4 Practices for Force Verification of Testing MachinesE6 Terminology Relating to Methods of Mechanical TestingE83 Practice for Verification and Classification of Exten-someter SystemsE122 Practice for Calculating Sample Size to Estimate,WithSpecified Precision,the Average for a Characteristic of aLot or ProcessE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE456 Terminology Relating to Quality and StatisticsE467 Practice for Verification of Constant Amplitude Dy-namic Forces in an Axial Fatigue Testing SystemE739 Practice for StatisticalAnalysis of Linear or LinearizedStress-Life(S-N)and Strain-Life(-N)Fatigue DataE1012 Practice for Verification of Testing Frame and Speci-men Alignment Under Tensile and Compressive AxialForce Application1This test method is under the jurisdiction of ASTM Committee D30 onComposite Materials and is the direct responsibility of Subcommittee D30.04 onLamina and Laminate Test Methods.Current edition approved April 1,2019.Published May 2019.Originallyapproved in 1976.Last previous edition approved in 2012 as D3479/D3479M 12.DOI:10.1520/D3479_D3479M-19.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 E1823 Terminology R