ASTM_C_1863_-_18.pdf

Designation:C186318Standard Test Method forHoop Tensile Strength of Continuous Fiber-ReinforcedAdvanced Ceramic Composite Tubular Test Specimens atAmbient Temperature Using Direct Pressurization1This standard is issued under the fixed designation C1863;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 hooptensile strength,including stress-strain response,of continuousfiber-reinforced advanced ceramic tubes subjected to directinternal pressurization that is applied monotonically at ambienttemperature.This type of test configuration is sometimesreferred to as“tube burst test.”This test method is specific totube geometries,because flaw populations,fiber architecture,material fabrication,and test specimen geometry factors areoften distinctly different in composite tubes,as compared toflat plates.1.2 In the test method,a composite tube/cylinder with adefined gage section and a known wall thickness is loaded viainternal pressurization from a pressurized fluid applied eitherdirectly to the material or through a secondary bladder insertedinto the tube.The monotonically applied uniform radial pres-sure on the inside of the tube results in hoop stress-strainresponse of the composite tube that is recorded until failure ofthe tube.The hoop tensile strength and the hoop fracturestrength are determined from the resulting maximum pressureand the pressure at fracture,respectively.The hoop tensilestrains,the hoop proportional limit stress,and the modulus ofelasticity in the hoop direction are determined from thestress-strain data.Note that hoop tensile strength as used in thistest method refers to the tensile strength in the hoop directionfrom the introduction of a monotonically applied internalpressure where monotonicrefers to a continuous nonstop testrate without reversals from test initiation to final fracture.1.3 This test method applies primarily to advanced ceramicmatrix composite tubes with continuous fiber reinforcement:unidirectional(1D,filament wound and tape lay-up),bidirec-tional(2D,fabric/tape lay-up and weave),and tridirectional(3D,braid and weave).These types of ceramic matrix com-posites can be composed of a wide range of ceramic fibers(oxide,graphite,carbide,nitride,and other compositions)in awide range of crystalline and amorphous ceramic matrixcompositions(oxide,carbide,nitride,carbon,graphite,andother compositions).1.4 This test method does not directly address discontinuousfiber-reinforced,whisker-reinforced,or particulate-reinforcedceramics,although the test methods detailed here may beequally applicable to these composites.1.5 The test method is applicable to a range of test specimentube geometries based on the intended application that includescomposite material property and tube radius.Lengths of thecomposite tube,length of the pressurized section,and length oftube overhang are determined so as to provide a gage lengthwith uniform internal radial pressure.A wide range of combi-nations of material properties,tube radii,wall thicknesses,tubelengths,and lengths of pressurized section are possible.1.5.1 This test method is specific to ambient temperaturetesting.Elevated temperature testing requires high-temperaturefurnaces and heating devices with temperature control andmeasurement systems and temperature-capable pressurizationmethods which are not addressed in this test method.1.6 This test method addresses tubular test specimengeometries,test specimen preparation methods,testing rates(that is,induced pressure rate),and data collection and report-ing procedures in the following sections:ScopeSection 1Referenced DocumentsSection 2TerminologySection 3Summary of Test MethodSection 4Significance and UseSection 5InterferencesSection 6ApparatusSection 7HazardsSection 8Test SpecimensSection 9Test ProcedureSection 10Calculation of ResultsSection 11ReportSection 12Precision and BiasSection 13KeywordsSection 14AppendixReferences1.7 Values expressed in this test method are in accordancewith the International System of Units(SI)and IEEE/ASTM SI10.1This 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 Jan.1,2018.Published January 2018.Originallyapproved in 2018.DOI:10.1520/C1863-18.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trad