ASTM C1161-2018 Standard Test Method for Flexural Strength of Advanced Ceramics at Ambient Temperature《环境温度下高级陶瓷弯曲强度的标准试验方法》.pdf
《ASTM C1161-2018 Standard Test Method for Flexural Strength of Advanced Ceramics at Ambient Temperature《环境温度下高级陶瓷弯曲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 C1161-2018 Standard Test Method for Flexural Strength of Advanced Ceramics at Ambient Temperature《环境温度下高级陶瓷弯曲强度的标准试验方法》.pdf(19页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: C1161 18Standard Test Method forFlexural Strength of Advanced Ceramics at AmbientTemperature1This standard is issued under the fixed designation C1161; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last r
2、evision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope1.1 This test method covers the determinat
3、ion of flexuralstrength of advanced ceramic materials at ambient temperature.Four-point-14-point and three-point loadings with prescribedspans are the standard as shown in Fig. 1. Rectangularspecimens of prescribed cross-section sizes are used withspecified features in prescribed specimen-fixture co
4、mbinations.Test specimens may be 3 by 4 by 45 to 50 mm in size that aretested on 40-mm outer span four-point or three-point fixtures.Alternatively, test specimens and fixture spans half or twicethese sizes may be used. The method permits testing ofmachined or as-fired test specimens. Several options
5、 formachining preparation are included: application matchedmachining, customary procedure, or a specified standard pro-cedure. This method describes the apparatus, specimenrequirements, test procedure, calculations, and reporting re-quirements. The test method is applicable to monolithic orparticula
6、te- or whisker-reinforced ceramics. It may also beused for glasses. It is not applicable to continuous fiber-reinforced ceramic composites.1.2 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.3 This standard does not purport t
7、o 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, health, and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was
8、 developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Reference
9、d Documents2.1 ASTM Standards:2C1239 Practice for Reporting Uniaxial Strength Data andEstimating Weibull Distribution Parameters for AdvancedCeramicsC1322 Practice for Fractography and Characterization ofFracture Origins in Advanced CeramicsC1368 Test Method for Determination of Slow CrackGrowth Par
10、ameters of Advanced Ceramics by ConstantStress Rate Strength Testing at Ambient TemperatureE4 Practices for Force Verification of Testing MachinesE337 Test Method for Measuring Humidity with a Psy-chrometer (the Measurement of Wet- and Dry-Bulb Tem-peratures)2.2 Military Standard:3MIL-STD-1942(MR) F
11、lexural Strength of High Perfor-mance Ceramics at Ambient Temperature3. Terminology3.1 Definitions:3.1.1 complete gage section, nthe portion of the specimenbetween the two outer bearings in four-point flexure andthree-point flexure fixtures.NOTE 1In this standard, the complete four-point flexure gag
12、e sectionis twice the size of the inner gage section. Weibull statistical analysis onlyincludes portions of the specimen volume or surface which experiencetensile stresses.3.1.2 flexural strength, FL2, na measure of the ultimatestrength of a specified beam in bending.3.1.3 four-point-14-point flexur
13、e, nconfiguration of flex-ural strength testing where a specimen is symmetrically loadedat two locations that are situated one-quarter of the overall spanaway from the outer two support bearings (see Fig. 1).1This test method is under the jurisdiction of ASTM Committee C28 onAdvanced Ceramics and is
14、 the direct responsibility of Subcommittee C28.01 onMechanical Properties and Performance.Current edition approved Jan. 1, 2018. Published February 2018. Originallyapproved in 1990. Last previous edition approved in 2013 as C1161 13. DOI:10.1520/C1161-18.2For referenced ASTM standards, visit the AST
15、M 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.3Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins Ave., Philade
16、lphia, PA 19111-5098, http:/www.dodssp.daps.mil.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 De
17、cision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.13.1.4 fully articulating fixture, na flexure fixture designedto be used either with flat and parallel specimens or withun
18、even or nonparallel specimens. The fixture allows fullindependent articulation, or pivoting, of all rollers about thespecimen 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 An
19、nex A1 for schematic illustrations of the requiredpivoting movements.NOTE 3A three-point fixture has the inner pair of bearing cylindersreplaced by a single bearing cylinder.3.1.5 inert flexural strength, FL2, na measure of thestrength of specified beam in bending as determined in anappropriate iner
20、t condition whereby no slow crack growthoccurs.NOTE 4An inert condition may be obtained by using vacuum, lowtemperatures, very fast test rates, or any inert media.3.1.6 inherent flexural strength, FL2, nthe flexuralstrength of a material in the absence of any effect of surfacegrinding or other surfa
21、ce finishing process, or of extraneousdamage that may be present. The measured inherent strength isin general a function of the flexure test method, test conditions,and test specimen size.3.1.7 inner gage section, nthe portion of the specimenbetween the inner two bearings in a four-point flexure fix
22、ture.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 specimen long axis, in order to matc
23、h the specimensurfaces. In addition, the upper or lower pairs are free to pivotto distribute force evenly to the bearing cylinders on eitherside.NOTE 5See Annex A1 for schematic illustrations of the requiredpivoting movements.NOTE 6A three-point fixture has the inner pair of bearing cylindersreplace
24、d by a single bearing cylinder.3.1.9 slow crack growth (SCG), nsubcritical crack growth(extension) which may result from, but is not restricted to, suchmechanisms as environmentally assisted stress corrosion ordiffusive crack growth.3.1.10 three-point flexure, nconfiguration of flexuralstrength test
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