ASTM_C_1323_-_16.pdf

Designation:C132316Standard Test Method forUltimate Strength of Advanced Ceramics with DiametrallyCompressed C-Ring Specimens at Ambient Temperature1This standard is issued under the fixed designation C1323;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.Scope1.1 This test method covers the determination of ultimatestrength under monotonic loading of advanced ceramics intubular form at ambient temperatures.The ultimate strength asused in this test method refers to the strength obtained undermonotonic compressive loading of C-ring specimens such asshown in Fig.1 where monotonic refers to a continuousnonstop test rate with no reversals from test initiation to finalfracture.This method permits a range of sizes and shapes sincetest specimens may be prepared from a variety of tubularstructures.The method may be used with microminiature testspecimens.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 Values expressed in this test method are in accordancewith the International System of Units(SI)and IEEE/ASTM SI10.1.3 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:2C1145 Terminology of Advanced CeramicsC1161 Test Method for Flexural Strength of AdvancedCeramics at Ambient TemperatureC1239 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 TemperatureC1683 Practice for Size Scaling of Tensile Strengths UsingWeibull Statistics for Advanced CeramicsE4 Practices for Force Verification of Testing MachinesE6 Terminology Relating to Methods of Mechanical TestingE337 Test Method for Measuring Humidity with a Psy-chrometer(the Measurement of Wet-and Dry-Bulb Tem-peratures)IEEE/ASTM SI 10 American National Standard for Use ofthe International System of Units(SI):The Modern MetricSystem3.Terminology3.1 Definitions:3.1.1 advanced ceramican engineered,high-performance,predominately nonmetallic,inorganic,ceramic material havingspecific functional qualities.(C1145)3.1.2 breaking forcethe force at which fracture occurs.(E6)3.1.3 C-ringcircular test specimen geometry with themid-section(slot)removed to allow bending displacement(compression or tension).(E6)3.1.4 flexural strengtha measure of the ultimate strengthof a specified beam in bending.3.1.5 modulus of elasticitythe ratio of stress to corre-sponding strain below the proportional limit.(E6)3.1.6 slow crack growthsubcritical crack growth(exten-sion)which may result from,but is not restricted to,suchmechanisms as environmentally assisted stress corrosion ordiffusive crack growth.4.Significance and Use4.1 This test method may be used for material development,material comparison,quality assurance,and characterization.Extreme care should be exercised when generating design data.4.2 For a C-ring under diametral compression,the maxi-mum tensile stress occurs at the outer surface.Hence,the1This test method is under the jurisdiction of ASTM Committee C28 onAdvanced Ceramics and is the direct responsibility of Subcommittee C28.04 onApplications.Current edition approved Jan.15,2016.Published February 2016.Originallyapproved in 1996.Last previous edition approved in 2010 as C1323 10.DOI:10.1520/C1323-16.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 C-ring specimen loaded in compression will predominatelyevaluate the strength distribution and flaw population(s)on theexternal surface of a tubular component.Accordingly,thecondition of the inner surface may be of lesser consequence inspecimen preparation and testing.NOTE1A C-ring in tension or an O-ring in compression may be usedto evaluate the internal surface.4.2.1 The flexure stress is computed based on simplecurved-beam theory(1,2,3,4,5).3It is assumed that thematerial is isotropic and homogeneous,the moduli of elasticityare identical in compression or tension,and the material islinearly elastic.These homogeneity and isotropy assumptionspreclude the use of this standard fo