ASTM_B_986_-_13e1.pdf

Designation:B986131Standard Test Method forDetermination of Tensile Strength by Mass Method forStranded Conductors Intended for use in ElectronicApplication1This standard is issued under the fixed designation B986;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 Department of Defense.1NOTEThe units for CM in Section 7.1 were editorially corrected in August 2013.1.Scope1.1 This test method covers the procedure for determiningthe tensile strength by a mass method for uninsulated strandedelectrical conductors intended for use in electronic application(Explanatory Note 1).1.1.1 The test method is intended for conductors that are onetype of wire(non-composite).The wire type being plain,clad,or coated and stranded together to operate mechanically andelectrically as a single conductor.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 and health practices and determine the applica-bility of regulatory limitations prior to use.Some specifichazards statements are given in Section 7 on Hazards.2.Referenced Documents2.1 ASTM Standards:2B354 Terminology Relating to Uninsulated Metallic Electri-cal ConductorsB800 Specification for 8000 Series Aluminum Alloy Wirefor Electrical PurposesAnnealed and Intermediate Tem-persE4 Practices for Force Verification of Testing MachinesE8/E8M Test Methods for Tension Testing of Metallic Ma-terials3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this test method,referto Terminology B354.4.Significance and Use4.1 This test method is designed as an inspection or accep-tance test of tensile strength for stranded metallic conductors.5.Apparatus5.1 Tensile Testing MachineMachines used for tensiontesting shall conform to the requirements of Practices E4.5.2 Balance,for measurement of mass,accurate to 0.1%.5.3 Steel Scale,for measurement of length,with smallerdivisions,not greater than132in.(1 mm).5.4 Jig,or equivalent equipment,for cutting the conductorto length and at right angles to its axis.6.Procedure6.1 Breaking Load:6.1.1 Conduct tensile test in accordance with Test MethodsE8/E8M and with a rate of loading not to exceed 10 in./min(250 mm/min.)(Explanatory Note 2 and Note 3).6.2 Specimen Mass/Unit Length:6.2.1 Cut the test specimens,making sure that the ends areat right angles to the axis of the conductor.The length of testspecimens shall be 2 ft(610 mm)minimum(Explanatory Note2).6.2.2 Measure the length of the specimen at room tempera-ture(see Note 1)to the nearest132in.(1 mm)and measure themass to within 60.1%accuracy,converting to lb/1000 ft orkg/km,if weighed in other units.1This practice is under the jurisdiction of ASTM Committee B01 on ElectricalConductors and is the direct responsibility of Subcommittee B01.02 on Methods ofTest and Sampling Procedure.Current edition approved April 1,2013.Published April 2013.DOI:10.1520/B0986-13E01.2For 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 States1 NOTE1Correction for temperature variation need not be made,sincethe error introduced in the length measurement by the temperaturevariation is less than the required accuracy of the length measurement.7.Calculation7.1 Calculate the tensile strength of the stranded conductoras follows(Explanatory Note 1):TS 5BL CM!3 MF 3100 1 k!100#where:TS=tensile strength of the stranded conductor,lb/in.2(N/mm2),BL=breaking load measurement read directly from thetensile tester,lb(N),CM=mass of conductor per unit length,lb/1000 ft(kg/km),MF=material factor,lb/in2 1000 ft(kg/mm2 km),(Table1 and Explanatory Note 4 and Note 5),andk=increment(increase)in mass and electrical resistance(from product specification),%.If no k value is given,the use k=0.8.Precision and Bias8.1 Precision and BiasThe precision and bias of this testmethod for tensile strength are essentially as specified in TestMethods E8/E8M.9.Keywords9.1 breaking loads;mass methods;metallic conductors;tensile strengthEXPLANATORY NOTESNOTE1Cross-sectional area of a stranded conductor used in elec-tronic applications can be difficult to determine since single wire diam-eters measured from the completed conductor can