ASTM_E_132_-_17.pdf

Designation:E13217Standard Test Method forPoissons Ratio at Room Temperature1This standard is issued under the fixed designation E132;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript 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 covers the determination of Poissonsratio from tension tests of structural materials at room tem-perature.This test method is limited to specimens of rectan-gular section and to materials in which and stresses at whichcreep is negligible compared to the strain produced immedi-ately upon loading.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 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.1.4 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:2E4 Practices for Force Verification of Testing MachinesE6 Terminology Relating to Methods of Mechanical TestingE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE8 Test Methods for Tension Testing of Metallic MaterialsE83 Practice for Verification and Classification of Exten-someter SystemsE111 Test Method for Youngs Modulus,Tangent Modulus,and Chord ModulusE1012 Practice for Verification of Testing Frame and Speci-men Alignment Under Tensile and Compressive AxialForce Application3.Terminology3.1 Definitions:Terms common to mechanical testing.3.1.1 The definitions of mechanical testing terms that ap-pear in Terminology E6 apply to this test method.These termsinclude extensometer and stress-strain diagram.3.1.2 In addition,the following common terms that appearin Terminology E6 apply to this test method.3.1.3 The terms accuracy,bias,and precision are used asdefined in E177.3.1.4 axial strain,nlinear strain in a plane parallel to thelongitudinal axis of the specimen.3.1.5 Poissons ratio,nthe negative of the ratio oftransverse strain to the corresponding axial strain resultingfrom an axial stress below the proportional limit of thematerial.3.1.5.1 DiscussionPoissons ratio may be negative forsome materials.For example,a tensile transverse strain willresult from a tensile axial strain.3.1.5.2 DiscussionPoissons ratio will have more than onevalue if the material is not isotropic.3.1.6 proportional limit,FL-2,nthe greatest stress that amaterial is capable of sustaining without any deviation fromproportionality of stress to strain(Hookes Law).3.1.6.1 DiscussionMany experiments have shown thatvalues observed for the proportional limit vary greatly with thesensitivity and accuracy of the testing equipment,eccentricityof loading,the scale to which the stress-strain diagram isplotted,and other factors.When determination of the propor-tional limit is required,the procedure and the sensitivity of thetest equipment should be specified.3.1.7 transverse strain,t,nlinear strain in a plane per-pendicular to the axis of the specimen.3.1.7.1 DiscussionTransverse strain may differ with direc-tion in anisotropic materials.3.2 Definitions of Terms Specific to This Standard:1This test method is under the jurisdiction of ASTM Committee E28 onMechanical Testing and is the direct responsibility of Subcommittee E28.04 onUniaxial Testing.Current edition approved July 15,2017.Published September 2017.Originallyapproved in 1958.Last previous edition approved in 2010 as E132 04(2010).DOI:10.1520/E0132-17.2For 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 3.2.1 longitudinal strain,l,nthe strain in the direction ofthe major axis of the specimen and