Designation:C695−15AnAmericanNationalStandardStandardTestMethodforCompressiveStrengthofCarbonandGraphite1ThisstandardisissuedunderthefixeddesignationC695;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thistestmethodcoversthedeterminationofthecom-pressivestrengthofcarbonandgraphiteatroomtemperature.1.2Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2E4PracticesforForceVerificationofTestingMachinesE177PracticeforUseoftheTermsPrecisionandBiasinASTMTestMethodsE691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethod3.Terminology3.1Definitions:3.1.1compressivestrength,n—propertyofsolidmaterialthatindicatesitsabilitytowithstandauniaxialcompressiveload.4.SignificanceandUse4.1Carbonandgraphitecanusuallysupporthigherloadsincompressionthaninanyothermodeofstress.Thistest,therefore,providesameasureofthemaximumload-bearingcapabilityofcarbonandgraphiteobjects.5.Apparatus5.1TestMachine,conformingtoPracticeE4andtotherequirementsforspeedoftestingprescribedinSection8ofthistestmethod.5.2SphericalBearingBlocksattachedtotheupperorlowerheadofthemachineinsuchamannerthatthesphericalsurfacesareinfullcontactwhennotloaded.Thecenterofcurvativeofthesphericalsurfaceshalllieonthesurfacethatcontactsthespecimenandonthemachineaxis.Thesphericalsurfacesshallbewell-lubricated.The...
