ASTM_C_1468_-_13.pdf

Designation:C146813Standard Test Method forTransthickness Tensile Strength of Continuous Fiber-Reinforced Advanced Ceramics at Ambient Temperature1This standard is issued under the fixed designation C1468;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.Scope*1.1 This test method covers the determination of transthick-ness tensile strengthSUT!under monotonic uniaxial forcing ofcontinuous fiber-reinforced ceramics(CFCC)at ambient tem-perature.This test method addresses,but is not restricted to,various suggested test specimen geometries,test fixtures,datacollection and reporting procedure.In general,round or squaretest specimens are tensile tested in the direction normal to thethickness by bonding appropriate hardware to the samples andperforming the test.For a Cartesian coordinate system,thex-axis and the y-axis are in the plane of the test specimen.Thetransthickness direction is normal to the plane and is labeledthe z-axis for this test method.For CFCCs,the plane of the testspecimen normally contains the larger of the three dimensionsand is parallel to the fiber layers for uni-directional,bi-directional,and woven composites.Note that transthicknesstensile strength as used in this test method refers to the tensilestrength obtained under monotonic uniaxial forcing wheremonotonic refers to a continuous nonstop test rate with noreversals from test initiation to final fracture.1.2 This test method is intended primarily for use with alladvanced ceramic matrix composites with continuous fiberreinforcement:unidirectional(1-D),bidirectional(2-D),woven,and tridirectional(3-D).In addition,this test methodalso may be used with glass(amorphous)matrix compositeswith 1-D,2-D,and 3-D continuous fiber reinforcement.Thistest method does not address directly discontinuous fiber-reinforced,whisker-reinforced or particulate-reinforcedceramics,although the test methods detailed here may beequally applicable to these composites.It should be noted that3-D architectures with a high volume fraction of fibers in the“z”direction may be difficult to test successfully.1.3 Values are in accordance with the International Systemof Units(SI)and IEEE/ASTM SI 10.1.4 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.Additional recom-mendations are provided in 6.7 and Section 7.2.Referenced Documents2.1 ASTM Standards:2C1145 Terminology of Advanced CeramicsC1239 Practice for Reporting Uniaxial Strength Data andEstimating Weibull Distribution Parameters for AdvancedCeramicsC1275 Test Method for Monotonic Tensile Behavior ofContinuous Fiber-Reinforced Advanced Ceramics withSolid Rectangular Cross-Section Test Specimens at Am-bient TemperatureC1468 Test Method for Transthickness Tensile Strength ofContinuous Fiber-Reinforced Advanced Ceramics at Am-bient TemperatureD3878 Terminology for Composite MaterialsE4 Practices for Force Verification of Testing MachinesE6 Terminology Relating to Methods of Mechanical TestingE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE337 Test Method for Measuring Humidity with a Psy-chrometer(the Measurement of Wet-and Dry-Bulb Tem-peratures)E691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodIEEE/ASTM SI 10 American National Standard for Use ofthe International System of Units(SI):The Modern MetricSystem.E1012 Practice for Verification of Testing Frame and Speci-men Alignment Under Tensile and Compressive AxialForce Application3.Terminology3.1 Definitions:1This test method is under the jurisdiction of ASTM Committee C28 onAdvanced Ceramics and is the direct responsibility of Subcommittee C28.07 onCeramic Matrix Composites.Current edition approved Feb.15,2013.Published April 2013.Originallyapproved in 2000.Last previous edition approved in 2006 as C1468 06.DOI:10.1520/C1468-13.2For 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.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.1 The definitions of terms relating to tensile testingappearing in Terminology E6 apply to the terms used in thistest method.The definitions of terms relating to advancedceramics appearing in Terminology C1145 apply to the termsused in this test method.The definitions of terms relating tofiber-reinforced comp