Designation:C1678−10(Reapproved2015)StandardPracticeforFractographicAnalysisofFractureMirrorSizesinCeramicsandGlasses1ThisstandardisissuedunderthefixeddesignationC1678;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticepertainstotheanalysisandinterpretationoffracturemirrorsizesinbrittlematerials.Fracturemirrors(Fig.1)aretelltalefractographicmarkingsthatsurroundafractureorigininbrittlematerials.Thefracturemirrorsizemaybeusedwithknownfracturemirrorconstantstoestimatethestressinafracturedcomponent.Alternatively,thefracturemirrorsizemaybeusedinconjunctionwithknownstressesintestspecimenstocalculatefracturemirrorconstants.Thepracticeisapplicabletoglassesandpolycrystallineceramiclaboratorytestspecimensaswellasfracturedcomponents.Theanalysisandinterpretationproceduresforglassesandceramicsaresimilar,buttheyarenotidentical.Differentopticalmicros-copyexaminationtechniquesarelistedanddescribed,includ-ingobservationangles,illuminationmethods,appropriatemagnification,andmeasurementprotocols.Guidanceisgivenforcalculatingafracturemirrorconstantandforinterpretingthefracturemirrorsizeandshapeforbothcircularandnoncircularmirrorsincludingstressgradients,geometricaleffects,and/orresidualstresses.Thepracticeprovidesfiguresandmicrographsillustratingthedifferenttypesoffeaturescommonlyobservedinandmeasurementtechniquesusedforthefracturemirrorsofglassesandpolycrystallineceramics.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2C1145Te...
