ASTM_C_1499_-_15.pdf

Designation:C149915Standard Test Method forMonotonic Equibiaxial Flexural Strength of AdvancedCeramics at Ambient Temperature1This standard is issued under the fixed designation C1499;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 the equibi-axial strength of advanced ceramics at ambient temperature viaconcentric ring configurations under monotonic uniaxial load-ing.In addition,test specimen fabrication methods,testingmodes,testing rates,allowable deflection,and data collectionand reporting procedures are addressed.Two types of testspecimens are considered:machined test specimens and as-fired test specimens exhibiting a limited degree of warpage.Strength as used in this test method refers to the maximumstrength obtained under monotonic application of load.Mono-tonic loading refers to a test conducted at a constant rate in acontinuous fashion,with no reversals from test initiation tofinal fracture.1.2 This test method is intended primarily for use withadvanced ceramics that macroscopically exhibit isotropic,homogeneous,continuous behavior.While this test method isintended for use on monolithic advanced ceramics,certainwhisker-or particle-reinforced composite ceramics as well ascertain discontinuous fiber-reinforced composite ceramics mayalso meet these macroscopic behavior assumptions.Generally,continuous fiber ceramic composites do not macroscopicallyexhibit isotropic,homogeneous,continuous behavior,and theapplication of this test method to these materials is notrecommended.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 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 CeramicsC1239 Practice for Reporting Uniaxial Strength Data andEstimating Weibull Distribution Parameters for AdvancedCeramicsC1259 Test Method for Dynamic Youngs Modulus,ShearModulus,and Poissons Ratio for Advanced Ceramics byImpulse Excitation of VibrationC1322 Practice for Fractography and Characterization ofFracture Origins in Advanced CeramicsE4 Practices for Force Verification of Testing MachinesE6 Terminology Relating to Methods of Mechanical TestingE83 Practice for Verification and Classification of Exten-someter SystemsE337 Test Method for Measuring Humidity with a Psy-chrometer(the Measurement of Wet-and Dry-Bulb Tem-peratures)F394 Test Method for Biaxial Flexure Strength(Modulus ofRupture)of Ceramic Substrates(Discontinued 2001)(Withdrawn 2001)3IEEE/ASTM SI 10 Standard for Use of the InternationalSystem of Units(SI):The Modern Metric System3.Terminology3.1 Definitions:3.1.1 The definitions of terms relating to biaxial testingappearing in Terminology E6 and Terminology C1145 mayapply to the terms used in this test method.Pertinent definitionsare listed below with the appropriate source given in parenthe-ses.Additional terms used in conjunction with this test methodare defined in the following section.3.1.2 advanced ceramic,nhighly engineered,high perfor-mance predominately non-metallic,inorganic,ceramic mate-rial having specific functional attributes.C11451This 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 July 1,2015.Published October 2013.Originallyapproved in 2001.Last previous edition approved in 2013 as C1499 09(2013).DOI:10.1520/C1499-15.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.3 breaking load,F,nload at which fracture occurs.E63.1.4 equibiaxial flexural strength,F/L2,nmaximumstress that a material is capable of sustaining when subjected toflexure between two concentric rings.This mode of flexure isa cupping of the circular plate caused by loading at the innerload ring and outer support ring.The equibiaxial flexuralstrength is calculated from the maximum-load of a biaxial testcarried to rupture,the original dimensions of the test specimen,and Poissons ratio.3.1.5 homogeneous,ncondition of a material in which therelevant pr