ASTM_C_1465_-_08_2013e1.pdf

Designation:C146508(Reapproved 2013)1Standard Test Method forDetermination of Slow Crack Growth Parameters ofAdvanced Ceramics by Constant Stress-Rate FlexuralTesting at Elevated Temperatures1This standard is issued under the fixed designation C1465;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.1NOTEFig.4 was reinserted editorially in March 2014.1.Scope1.1 This test method covers the determination of slow crackgrowth(SCG)parameters of advanced ceramics by usingconstant stress-rate flexural testing in which flexural strength isdetermined as a function of applied stress rate in a givenenvironment at elevated temperatures.The strength degrada-tion exhibited with decreasing applied stress rate in a specifiedenvironment is the basis of this test method which enables theevaluation of slow crack growth parameters of a material.NOTE1This test method is frequently referred to as“dynamicfatigue”testing(Refs(1-3)2in which the term“fatigue”is usedinterchangeably with the term“slow crack growth.”To avoid possibleconfusion with the“fatigue”phenomenon of a material which occursexclusively under cyclic loading,as defined in Terminology E1823,thistest method uses the term“constant stress-rate testing”rather than“dynamic fatigue”testing.NOTE2In glass and ceramics technology,static tests of considerableduration are called“static fatigue”tests,a type of test designated asstress-rupture(Terminology E1823).1.2 This test method is intended primarily to be used fornegligible creep of test specimens,with specific limits on creepimposed in this test method.1.3 This test method applies primarily to advanced ceramicsthat are macroscopically homogeneous and isotropic.This testmethod may also be applied to certain whisker-or particle-reinforced ceramics that exhibit macroscopically homogeneousbehavior.1.4 This test method is intended for use with various testenvironments such as air,vacuum,inert,and any other gaseousenvironments.1.5 Values expressed in this standard test are in accordancewith the International System of Units(SI)and IEEE/ASTM SI 10.1.6 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:3C1145 Terminology of Advanced CeramicsC1211 Test Method for Flexural Strength of AdvancedCeramics at Elevated TemperaturesC1239 Practice for Reporting Uniaxial Strength Data andEstimating Weibull Distribution Parameters for AdvancedCeramicsC1322 Practice for Fractography and Characterization ofFracture Origins in Advanced CeramicsC1368 Test Method for Determination of Slow CrackGrowth Parameters of Advanced Ceramics by ConstantStress-Rate Strength Testing at Ambient TemperatureD1239 Test Method for Resistance of Plastic Films toExtraction by ChemicalsE4 Practices for Force Verification of Testing MachinesE6 Terminology Relating to Methods of Mechanical TestingE220 Test Method for Calibration of Thermocouples ByComparison TechniquesE230 Specification and Temperature-Electromotive Force(EMF)Tables for Standardized ThermocouplesE337 Test Method for Measuring Humidity with a Psy-chrometer(the Measurement of Wet-and Dry-Bulb Tem-peratures)1This test method is under the jurisdiction of ASTM Committee C28 onAdvanced Ceramics and is the direct responsibility of Subcommittee C28.01 onMechanical Properties and Performance.Current edition approved Aug.1,2013.Published September 2013.Originallyapproved in 2000.Last previous edition approved in 2008 as C1465 08.DOI:10.1520/C1465-08R13.2The boldface numbers in parentheses refer to the list of references at the end ofthis standard.3For 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 States1 E616 Terminology Relating to Fracture Testing(Discontin-ued 1996)(Withdrawn 1996)4E1150 Definitions of Terms Relating to Fatigue(Withdrawn1996)4IEEE/ASTM SI 10 American National Standard for Use ofthe International System of Units(SI):The Modern MetricSystemE1823 Terminology Relating to Fatigue and Fracture Testing3.Terminology3.1 Definitions:3.1.1 The terms described in Terminologies C1145,E6,andE1823 are applicable to this test method.Specific termsrelevant to this test method are as follows:3.1.2 advanced ceramic,na highly engineered,high-performance,predominately,nonmetallic,inorganic,ceramicmaterial having specific functional at