ASTM C1368-2010 Standard Test Method for Determination of Slow Crack Growth Parameters of Advanced Ceramics by Constant Stress-Rate Strength Testing at Ambient Temperature《环境温度下通过恒.pdf
《ASTM C1368-2010 Standard Test Method for Determination of Slow Crack Growth Parameters of Advanced Ceramics by Constant Stress-Rate Strength Testing at Ambient Temperature《环境温度下通过恒.pdf》由会员分享,可在线阅读,更多相关《ASTM C1368-2010 Standard Test Method for Determination of Slow Crack Growth Parameters of Advanced Ceramics by Constant Stress-Rate Strength Testing at Ambient Temperature《环境温度下通过恒.pdf(11页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: C1368 10Standard Test Method forDetermination of Slow Crack Growth Parameters ofAdvanced Ceramics by Constant Stress-Rate StrengthTesting at Ambient Temperature1This standard is issued under the fixed designation C1368; the number immediately following the designation indicates the year
2、 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 slow crack
3、growth (SCG) parameters of advanced ceramics by usingconstant stress-rate rectangular beam flexural testing, or ring-on-ring biaxial disk flexural testing, or direct tensile strength,in which strength is determined as a function of applied stressrate in a given environment at ambient temperature. Th
4、estrength degradation exhibited with decreasing applied stressrate in a specified environment is the basis of this test methodwhich enables the evaluation of slow crack growth parametersof a material.NOTE 1This test method is frequently referred to as “dynamicfatigue” testing (Refs (1-3)2) in which
5、the term “fatigue” is usedinterchangeably with the term “slow crack growth.” To avoid possibleconfusion with the “fatigue” phenomenon of a material which occursexclusively under cyclic loading, as defined in Terminology E1823, thistest method uses the term “constant stress-rate testing” rather than“
6、dynamic fatigue” testing.NOTE 2In glass and ceramics technology, static tests of considerableduration are called “static fatigue” tests, a type of test designated asstress-rupture (See Terminology E1823).1.2 Values expressed in this test method are in accordancewith the International System of Units
7、 (SI) and IEEE/ASTM SI10.1.3 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 regulatory limitations pri
8、or to use.2. Referenced Documents2.1 ASTM Standards:3C1145 Terminology of Advanced CeramicsC1161 Test Method for Flexural Strength of AdvancedCeramics at Ambient TemperatureC1239 Practice for Reporting Uniaxial Strength Data andEstimating Weibull Distribution Parameters for AdvancedCeramicsC1273 Tes
9、t Method for Tensile Strength of MonolithicAdvanced Ceramics at Ambient TemperaturesC1322 Practice for Fractography and Characterization ofFracture Origins in Advanced CeramicsC1499 Test Method for Monotonic Equibiaxial FlexuralStrength of Advanced Ceramics at Ambient TemperatureE4 Practices for For
10、ce Verification of Testing MachinesE6 Terminology Relating to Methods of Mechanical TestingE337 Test Method for Measuring Humidity with a Psy-chrometer (the Measurement of Wet- and Dry-Bulb Tem-peratures)E1823 Terminology Relating to Fatigue and Fracture Test-ingIEEE/ASTM SI 10 American National Sta
11、ndard for Use ofthe International System of Units (SI): The Modern MetricSystem3. Terminology3.1 DefinitionsThe terms described in TerminologiesC1145, E6, and E1823 are applicable to this test method.Specific terms relevant to this test method are as follows:3.1.1 advanced ceramic, na highly enginee
12、red, high-performance, predominately nonmetallic, inorganic, ceramicmaterial having specific functional attributes. (C1145)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 Perform
13、ance.Current edition approved Dec. 1, 2010. Published January 2011. Originallyapproved in 1997. Last previous edition approved in 2006 as C1368 06. DOI:10.1520/C1368-10.2The boldface numbers in parentheses refer to the list of references at the end ofthis standard.3For referenced ASTM standards, vis
14、it 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.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International,
15、 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3.1.2 constant stress rate,s, na constant rate of maximumstress applied to a specified beam by using either a constantloading or constant displacement rate of a testing machine.3.1.3 environment, nthe aggregate of c
16、hemical speciesand energy that surrounds a test specimen. (E1823)3.1.4 environmental chamber, nthe container of bulkvolume surrounding a test specimen. (E1823)3.1.5 equibiaxial flexural strength F/L2, nthe maximumstress that a material is capable of sustaining when subjected toflexure between two co
17、ncentric rings.3.1.5.1 DiscussionThis mode of flexure is a cupping ofthe circular plate caused by loading at the inner load ring andouter support ring. The equibiaxial flexural strength is calcu-lated from the maximum-load of a biaxial test carried torupture, the original dimensions of the test spec
18、imen, andPoissons ratio. (C1499)3.1.6 flexural strength, sf, na measure of the strength of aspecified beam specimen in bending determined at a givenstress rate in a particular environment.3.1.7 fracture toughness, na generic term for measures ofresistance to extension of a crack. (E1823)3.1.8 inert
19、strength, na measure of the strength of aspecified strength test specimen as determined in an appropri-ate inert condition whereby no slow crack growth occurs.3.1.8.1 DiscussionAn inert condition may be obtained byusing vacuum, low temperatures, very fast test rates, or anyinert mediums.3.1.9 slow c
20、rack 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 strength-stress rate curve, na curve fitted to thevalues of strength at each of several stress rates, b
21、ased on therelationship between strength and stress rate: log sf= 1/(n +1)log s + log D. (See Appendix X1.)3.1.10.1 DiscussionIn the ceramics literature, this is oftencalled a dynamic fatigue curve.3.1.11 strength-stress rate diagram, na plot of strengthagainst stress rate. Both strength and stress
22、rate are plotted onlog-log scales.3.1.12 stress intensity factor, KI, nthe magnitude of theideal-crack-tip stress field (stress-field singularity) subjected tomode I loading in a homogeneous, linear elastic body.(E1823)3.1.13 tensile strength F/L2, nSuthe maximum tensilestress which a material is ca
23、pable of sustaining.3.1.13.1 DiscussionTensile strength is calculated from themaximum force during a tension test carried to rupture and theoriginal cross-sectional area of the specimen. (C1273)3.2 Definition of Term Specific to This Standard:3.2.1 slow crack growth parameters, n and D, ntheparamete
24、rs estimated as constants in the flexural strength-stressrate equation, which represent the degree of slow crack growthsusceptibility of a material. (See Appendix X1.)4. Significance and Use4.1 For many structural ceramic components in service,their use is often limited by lifetimes that are control
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
下载文档到电脑,查找使用更方便
10000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ASTMC13682010STANDARDTESTMETHODFORDETERMINATIONOFSLOWCRACKGROWTHPARAMETERSOFADVANCEDCERAMICSBYCONSTANTSTRESSRATESTRENGTHTESTINGATAMBIENTTEMPERATURE

链接地址:http://www.mydoc123.com/p-464377.html