ASTM_C_1424_-_15.pdf

Designation:C142415Standard Test Method forMonotonic Compressive Strength of Advanced Ceramics atAmbient Temperature1This standard is issued under the fixed designation C1424;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 compres-sive strength including stress-strain behavior,under monotonicuniaxial loading of advanced ceramics at ambient temperature.This test method is restricted to specific test specimen geom-etries.In addition,test specimen fabrication methods,testingmodes(force or displacement),testing rates(force rate,stressrate,displacement rate,or strain rate),allowable bending,anddata collection and reporting procedures are addressed.Com-pressive strength as used in this test method refers to thecompressive strength obtained under monotonic uniaxial load-ing.Monotonic loading refers to a test conducted at a constantrate in a continuous fashion,with no reversals from testinitiation to final 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(CFCCs)do not macro-scopically exhibit isotropic,homogeneous,continuous behav-ior and,application of this test method to these materials is notrecommended.1.3 Values expressed in this test method are in accordancewith the International System of Units(SI)and IEEE/ASTM SI10.1.4 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:2C773 Test Method for Compressive(Crushing)Strength ofFired Whiteware MaterialsC1145 Terminology of Advanced CeramicsD695 Test Method for Compressive Properties of RigidPlasticsE4 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)E1012 Practice for Verification of Testing Frame and Speci-men Alignment Under Tensile and Compressive AxialForce ApplicationIEEE/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 compressive test-ing appearing in Terminology E6,Test Method D695,andTerminology C1145 may apply to the terms used in this testmethod.Pertinent definitions as listed in Practice E1012,Terminology C1145,and Terminology E6 are shown in thefollowing with the appropriate source given in parentheses.Additional terms used in conjunction with this test method aredefined in the following.3.1.2 advanced ceramic,na highly engineered,high-performance predominately nonmetallic,inorganic,ceramicmaterial having specific functional attributes.(C1145)3.1.3 axial strain,n L/Lthe average longitudinal strainsmeasured at the surface on opposite sides of the longitudinalaxis of symmetry of the specimen by two strain-sensingdevices located at the mid length of the reduced section.(E1012)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 July 1,2015.Published October 2015.Originallypublished in 1999.Last previous edition approved in 2015 as C1424 10(2015).DOI:10.1520/C1424-15.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.4 bending strain,n L/Lthe difference between thestrain at the surface and the axial strain.In general,the bendingstrain varies from point to point around and along the reducedsection of the test specimen.(E1012)3.1.5 breaking load,n Fthe load at which fractureoccurs.(E6)3.1.6 compressive strength,n F/L2the maximum com-pressive stress which a material is capable of sustaining.Compressive strength is calculated from the maximum loadduring a compression test carried to rupture and the originalcross-se