ASTM C1211-2002(2008) Standard Test Method for Flexural Strength of Advanced Ceramics at Elevated Temperatures《高温下高级陶瓷抗弯强度的标准试验方法》.pdf
《ASTM C1211-2002(2008) Standard Test Method for Flexural Strength of Advanced Ceramics at Elevated Temperatures《高温下高级陶瓷抗弯强度的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM C1211-2002(2008) Standard Test Method for Flexural Strength of Advanced Ceramics at Elevated Temperatures《高温下高级陶瓷抗弯强度的标准试验方法》.pdf(17页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: C 1211 02 (Reapproved 2008)Standard Test Method forFlexural Strength of Advanced Ceramics at ElevatedTemperatures1This standard is issued under the fixed designation C 1211; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revisi
2、on, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers determination of the flexuralstrength of advanced ceramics at elevated temper
3、atures.2Four-point-14 point and three-point loadings with prescribedspans are the standard. Rectangular specimens of prescribedcross-section are used with specified features in prescribedspecimen-fixture combinations.1.2 The values stated in SI units are to be regarded as thestandard. The values giv
4、en in parentheses are for informationonly.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 regulator
5、y limitations prior to use.2. Referenced Documents2.1 ASTM Standards:3C 1161 Test Method for Flexural Strength of AdvancedCeramics at Ambient TemperatureC 1239 Practice for Reporting Uniaxial Strength Data andEstimating Weibull Distribution Parameters for AdvancedCeramicsC 1322 Practice for Fractogr
6、aphy and Characterization ofFracture Origins in Advanced CeramicsC 1341 Test Method for Flexural Properties of ContinuousFiber-Reinforced Advanced Ceramic CompositesC 1368 Test Method for Determination of Slow CrackGrowth Parameters of Advanced Ceramics by ConstantStress-Rate Flexural Testing at Amb
7、ient TemperatureC 1465 Test Method for Determination of Slow CrackGrowth Parameters of Advanced Ceramics by ConstantStress-Rate Flexural Testing at Elevated TemperaturesE4 Practices for Force Verification of Testing MachinesE 220 Test Method for Calibration of Thermocouples ByComparison TechniquesE
8、230 Specification and Temperature-Electromotive Force(EMF) Tables for Standardized Thermocouples2.2 Military Standard:MIL-STD 1942(A) Flexural Strength of High PerformanceCeramics at Ambient Temperature43. Terminology3.1 Definitions:3.1.1 complete gage section, nthe portion of the specimenbetween th
9、e two outer bearings in four-point flexure andthree-point flexure fixtures.NOTE 1In this standard, the complete four-point flexure gage sectionis twice the size of the inner gage section. Weibull statistical analyses, inthis instance, only include portions of the specimen volume or surfacewhich expe
10、rience tensile stresses.3.1.2 flexural strengtha measure of the ultimate strengthof a specified beam in bending.3.1.3 four-point-1/4 point flexurea configuration of flex-ural strength testing in which a specimen is symmetricallyloaded at two locations that are situated at one-quarter of theoverall s
11、pan, away from the outer two support bearings (seeFig. 1).3.1.4 fully-articulating fixture, na flexure fixture designedto be used either with flat and parallel specimens or withuneven or nonparallel specimens. The fixture allows fullindependent articulation, or pivoting, of all rollers about thespec
12、imen long axis to match the specimen surface. In addition,the upper or lower pairs are free to pivot to distribute forceevenly to the bearing cylinders on either side.NOTE 2See Annex A2 for schematic illustrations of the requiredpivoting movements.NOTE 3A three-point fixture has the inner pair of be
13、aring cylinders1This 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 Jan. 1, 2008. Published January 2008. Originallyapproved in 1992. Last previou
14、s edition approved in 1998 as C 1211-98a.2Elevated temperatures typically denote, but are not restricted to 200 to 1600C.3For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refe
15、r to the standards Document Summary page onthe ASTM website.4Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http:/www.dodssp.daps.mil. This document is a 1990 update of the original MIL-STD1942(MR), dated November 1983.1
16、Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.Copyright by ASTM Intl (all rights reserved); Mon Sep 15 23:16:50 EDT 2008Downloaded/printed byGuo Dehua (CNIS) pursuant to License Agreement. No further reproductions authorized.replace
17、d by a single bearing cylinder.3.1.5 inert flexural strength, na measure of the strength ofa specified beam specimen in bending as determined in anappropriate inert condition whereby no slow crack growthoccurs.3.1.6 inherent flexural strength, nthe flexural strength of amaterial in the absence of an
18、y effect of surface grinding orother surface finishing process, or of extraneous damage thatmay be present. The measured inherent strength is in general afunction of the flexure test method, test conditions, andspecimen size.3.1.7 inner gage section, nthe portion of the specimenbetween the inner two
19、 bearings in a four-point flexure fixture.3.1.8 semi-articulating fixture, na flexure fixture designedto be used with flat and parallel specimens. The fixture allowssome articulation, or pivoting, to ensure the top pair (or bottompair) of bearing cylinders pivot together about an axis parallelto the
20、 specimen long axis, in order to match the specimensurfaces. In addition, the upper or lower pairs are free to pivotto distribute force evenly to the bearing cylinders on eitherside.NOTE 4See Annex A2 for schematic illustrations of the requiredpivoting movements.NOTE 5A three-point fixture has the i
21、nner pair of bearing cylindersreplaced by a single bearing cylinder.3.1.9 slow crack growth (SCG), nSubcritical crackgrowth (extension) which may result from, but is not restrictedto, such mechanisms as environmentally-assisted stress corro-sion or diffusive crack growth.3.1.10 three-point flexurea
22、configuration of flexuralstrength testing in which a specimen is loaded at a positionmidway between two support bearings (see Fig. 1).4. Significance and Use4.1 This test method may be used for material development,quality control, characterization, and design data generationpurposes. This test meth
23、od is intended to be used with ceramicswhose flexural strength is ; 50 MPa (; 7 ksi) or greater.4.2 The flexure stress is computed based on simple beamtheory, with assumptions that the material is isotropic andhomogeneous, the moduli of elasticity in tension and compres-sion are identical, and the m
24、aterial is linearly elastic. Theaverage grain size should be no greater than150 of the beamthickness. The homogeneity and isotropy assumptions in thetest method rule out the use of it for continuous fiber-reinforcedcomposites for which Test Method C 1341 is more appropriate.4.3 The flexural strength
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