ASTM_C_565_-_15.pdf

Designation:C56515An American National StandardStandard Test Methods forTension Testing of Carbon and Graphite MechanicalMaterials1This standard is issued under the fixed designation C565;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.1.Scope*1.1 These test methods cover the apparatus,specimen,andprocedures for the tension testing of carbon and graphitemechanical materials with a grain size smaller than 0.79 mm.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.2.1 ExceptionAll of the figures are dimensioned ininches in accordance with the original 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.2.Referenced Documents2.1 ASTM Standards:2C749 Test Method for Tensile Stress-Strain of Carbon andGraphiteE4 Practices for Force Verification of Testing MachinesE6 Terminology Relating to Methods of Mechanical Testing3.Terminology3.1 Definitions:3.1.1 The definitions of terms relating to tension testing inTerminology E6 shall be considered as applying to the termsused in these test methods.3.1.2 tensile strength,nproperty of solid material thatindicates its ability to withstand a uniaxial tensile load,converted to unit stress based on the original cross-section areaof the tensile test specimen.3.1.3 ultimate tensile strength,nthe maximum tensilestress applied in stretching a specimen to rupture.4.Significance and Use4.1 These test methods may be used for quality controltesting of established grades of carbon and graphite materials,in the development of new grades,and for other purposeswhere relative strength levels are the primary quantities ofinterest.This test method may be applicable only if the ratio ofspecimen diameter to grain size,or flaw size,is greater than 5.4.2 These test methods do not substitute for that describedin Test Method C749,but are useful where less sophisticateddata and less expensive techniques are sufficient.4.3 Carbon and graphite materials exhibit significant physi-cal property differences within parent materials.Exact sam-pling patterns and grain orientations must be specified in orderto make meaningful tensile strength comparisons.5.Apparatus5.1 Testing MachineThe machine used for tension testingshall conform to the requirements of Practices E4.The testingmachine shall have a capacity that the breaking load of the testspecimen falls between 10%and 90%of the scale capacity.5.2 Gripping DevicesGripping devices that conform tothe principles of those illustrated in Fig.1 shall be used(dimensions that reflect the use of SI units are permissible).These gripping devices shall be attached to the heads of thetesting machine through chain connectors.Fig.2 shows thegripping device connected to the heads.Extreme care shall betaken that the axis of the test specimen is located on the centerline of the head of the testing machine.6.Test Specimens6.1 Test specimens shall be produced to the configurationshown in Fig.3.6.2 Improperly prepared test specimens often cause unsat-isfactory test results.It is important,therefore,that care beexercised in the preparation of specimens,particularly in themachining and polishing.6.3 The specimen shall be hand polished with No.000 drypaper until no circular grooves are visible to the naked eye.1These test methods are under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and are the direct responsibilityof Subcommittee D02.F0 on Manufactured Carbon and Graphite Products.Current edition approved Dec.1,2015.Published January 2016.Originallyapproved in 1965.Last previous edition approved in 2010 as C565 93(2010)1.DOI:10.1520/C0565-15.2For 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.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.4 The acceptable fracture zone of the specimen shall be19 mm long with the center of the zone at the point ofminimum diameter.Marks indicating fracture zone limits maybe applied with ink or layout dope,but no scratching,punching,or notching of the specimen is permissible.6.5 To determine the cross-sectional area,the diameter ofthe specimen at the narrowest point shall be used.Thedimension shall be recorded to the nearest 0.02 mm.7.Speed of Testin