ASTM_D_4018_-_17.pdf

Designation:D401817Standard Test Methods forProperties of Continuous Filament Carbon and GraphiteFiber Tows1This standard is issued under the fixed designation D4018;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 These test methods cover the preparation and tensiletesting of resin-impregnated and consolidated test specimensmade from continuous filament carbon and graphite yarns,rovings,and tows to determine their tensile properties.1.2 These test methods also cover the determination of thedensity and mass per unit length of the yarn,roving,or tow toprovide supplementary data for tensile property calculation.1.3 These test methods include a procedure for sizingremoval to provide the preferred desized fiber samples fordensity measurement.This procedure may also be used todetermine the weight percent sizing.1.4 These test methods include a procedure for determiningthe weight percent moisture adsorption of carbon or graphitefiber.1.5 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.6 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 ASTM Standards:2D70 Test Method for Density of Semi-Solid BituminousMaterials(Pycnometer Method)D1193 Specification for Reagent WaterD3800 Test Method for Density of High-Modulus FibersD5550 Test Method for Specific Gravity of Soil Solids byGas PycnometerE4 Practices for Force Verification of Testing MachinesE83 Practice for Verification and Classification of Exten-someter Systems2.2 Other Document:CRC Handbook of Chemistry and Physics33.Terminology3.1 Definitions:3.1.1 sizing,na generic term for compounds which,whenapplied to yarn or fabric,form a more or less continuous solidfilm around the yarn and individual fibers.3.2 Definitions of Terms Specific to This Standard:3.2.1 desized fiber,nfiber which has had a sizing removedfrom it.3.2.2 fiber,ncontinuous filament carbon or graphite yarn,roving,or tow.3.2.3 sized fiber,na fiber with a sizing applied to it.3.2.4 unsized fiber,nfiber which has never had a sizingapplied to it.3.3 Symbols:3.3.1 AUnit conversion factor for tensile strength3.3.2 BUnit conversion factor for tensile modulus3.3.3 Efiber chord modulus3.3.4 lLower strain limit3.3.5 uUpper strain limit3.3.6 kccorrection factor for density of size3.3.7 Lspecimen length3.3.8 MULthe mass per unit length of the sized fiber3.3.9 MULIthe mass per unit length of the impregnatedand consolidated fiber3.3.10 Pmaximum load3.3.11 Pltensile load at lower strain limit1These test methods are under the jurisdiction of ASTM Committee D30 onComposite Materials and are the direct responsibility of Subcommittee D30.03 onConstituent/Precursor Properties.Current edition approved Jan.15,2017.Published January 2017.Originallyapproved in 1981.Last previous edition approved in 2011 as D4018 11.DOI:10.1520/D4018-17.2For 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.3CRC Press Inc.,Boca Raton,Ann Arbor,London,Tokyo,73rd Edition,19921993.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 3.3.12 Putensile load at upper strain limit3.3.13 fdensity of the fiber3.3.14 sfdensity of the fiber with sizing3.3.15 RCweight percent of resin(resin content)3.3.16 W1specimen mass4.Summary of Test Methods4.1 These test methods include procedures for determiningthe tensile strength and modulus of a resin-impregnated andconsolidated carbon fiber tow.Also included are procedures tomeasure the mass per unit length and density of the carbonfiber and the resin content of the resin-impregnated andconsolidated specimens.4.2 MULThe MUL of the fiber is determined by dividingthe mass of a sample of sized fiber by its length.4.3 DensityThe density of the fiber is determined usingArchimedes method or a pycnometer method.The recom-mended specimen is desized or unsized fiber.The idealimmersion fluid is one that completely wets the spe