ASTM_B_987_-_B_987M_-_17.pdf

Designation:B987/B987M17Standard Specification forCarbon Fiber Thermoset Polymer Matrix Composite Core(CFC)for use in Overhead Electrical Conductors1This standard is issued under the fixed designation B987/B987M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers carbon fiber reinforced ther-moset matrix composite core strength members for use inreinforcing or supporting overhead electrical conductors.1.2 This specification covers carbon fiber core diametersfrom 0.180 to 0.500 in.4.57 to 12.7 mm,inclusive.1.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 The following documents of the issue in effect on dateof material purchase form a part of this specification to theextent referenced herein.2.2 ASTM Standards:2D792 Test Methods for Density and Specific Gravity(Rela-tive Density)of Plastics by DisplacementD3916 Test Method for Tensile Properties of PultrudedGlass-Fiber-Reinforced Plastic RodD5117 Test Method for Dye Penetration of Solid FiberglassReinforced Pultruded StockD5423 Specification for Forced-Convection Laboratory Ov-ens for Evaluation of Electrical InsulationD7028 Test Method for Glass Transition Temperature(DMATg)of Polymer Matrix Composites by Dynamic Mechani-cal Analysis(DMA)E29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 CFC(carbon fiber composite core/thermoset matrix),nconsisting of continuous carbon fiber tows held together bya polymer matrix where the polymer is specifically a thermo-setting polymer.The carbon fiber composite core is protectedwith a galvanic protection barrier layer.3.1.2 core,nsee CFC.3.1.3 design validation tests,nthe purpose of these tests isto verify the suitability of the CFC design,materials,andmethod of manufacturing to meet the requirements in thisspecification.To ensure compliance with this specification,these tests shall be performed on composite core samples at thetime of manufacture and be repeated whenever the design,manufacturing method or the materials have changed.Theresults of design validation tests are to be recorded and areconsidered valid for the whole class of CFC.3.1.4 DMA(dynamic mechanical analyzer),na devicethat measures the Tgof a polymer matrix or composite bysubjecting the sample to an oscillating stress while heating thespecimen at a given heating rate.3.1.5 galvanic protection barrier layer,na layer thatprevents the carbon fiber of the composite core from makingcontact with the aluminum strands used in the conductor.3.1.6 glass transition temperature(Tg),na temperaturewhere the polymer matrix properties transition from a hard,glassy state to a rubbery state.This temperature is defined to bethe temperature at which a curve defined by plotting lossmodulus versus temperature reaches its peak value.3.1.7 loss modulus,nrepresents the viscous portion of thepolymer matrix response to the simultaneous application ofheat and stress;is proportional to the energy dissipated as heatby the composite sample in the DMA and reaches a maximumvalue when the polymer matrix in the composite transitionsfrom the glassy to the rubbery state(Tg).1This specification is under the jurisdiction of ASTM Committee B01 onElectrical Conductors and is the direct responsibility of Subcommittee B01.07 onConductors of Light Metals.Current edition approved Feb.1,2017.Published March 2017.Originallyapproved in 2014.Last previous edition approved in 2014 as B987/B987M 14.DOI:10.1520/B0987/B0987M-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)