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Standard Test Method for Flexural Strength of Advanced Ceramics at Elevated Temperatures
Automatische name übersetzung:
Standard Test Method for Biegefestigkeit von Hochleistungskeramik bei erhöhten Temperaturen
NORM herausgegeben am 1.8.2013
Bezeichnung normen: ASTM C1211-13
Anmerkung: UNGÜLTIG
Ausgabedatum normen: 1.8.2013
SKU: NS-10059
Zahl der Seiten: 17
Gewicht ca.: 51 g (0.11 Pfund)
Land: Amerikanische technische Norm
Kategorie: Technische Normen ASTM
Keywords:
elevated temperature, flexural strength, four-point flexure, three-point flexure, ICS Number Code 81.060.99 (Other standards related to ceramics), 81.060.30 (Advanced ceramics)
Significance and Use | ||||||||||||||||||
4.1 This test method may be used for material development, quality control, characterization, and design data generation purposes. This test method is intended to be used with ceramics whose flexural strength is ∼ 50 MPa (∼ 7 ksi) or greater. 4.2 The flexure stress is computed based on simple beam theory, with assumptions that the material is isotropic and homogeneous, the moduli of elasticity in tension and compression are identical, and the material is linearly elastic. The average grain size should be no greater than 1/50 of the beam thickness. The homogeneity and isotropy assumptions in the test method rule out the use of it for continuous fiber-reinforced composites for which Test Method C1341 is more appropriate. 4.3 The flexural strength of a group of test specimens is influenced by several parameters associated with the test procedure. Such factors include the testing rate, test environment, specimen size, specimen preparation, and test fixtures. Specimen and fixture sizes were chosen to provide a balance between the practical configurations and resulting errors as discussed in Test Method C1161, and Refs (1-3).4 Specific fixture and specimen configurations were designated in order to permit the ready comparison of data without the need for Weibull size scaling. 4.4 The flexural strength of a ceramic material is dependent on both its inherent resistance to fracture and the size and severity of flaws. Variations in these cause a natural scatter in test results for a sample of test specimens. Fractographic analysis of fracture surfaces, although beyond the scope of this test method, is highly recommended for all purposes, especially if the data will be used for design as discussed in Ref (4.5 This method determines the flexural strength at elevated temperature and ambient environmental conditions at a nominal, moderately fast testing rate. The flexural strength under these conditions may or may not necessarily be the inert flexural strength. Flexure strength at elevated temperature may be strongly dependent on testing rate, a consequence of creep, stress corrosion, or slow crack growth. If the purpose of the test is to measure the inert flexural strength, then extra precautions are required and faster testing rates may be necessary. 4.6 The three-point test
configuration exposes only a very small portion of the specimen to
the maximum stress. Therefore, three-point flexural strengths are
likely to be much greater than four-point flexural strengths.
Three-point flexure has some advantages. It uses simpler test
fixtures, it is easier to adapt to high temperature, and it is
sometimes helpful in Weibull statistical studies. However,
four-point flexure is preferred and recommended for most
characterization purposes.
4.7 The three-point test configuration exposes only a very small portion of the specimen to the maximum stress. Therefore, three-point flexural strengths are likely to be much greater than four-point flexural strengths. Three-point flexure has some advantages. It uses simpler test fixtures, it is easier to adapt to high temperature, and it is sometimes helpful in Weibull statistical studies. However, four-point flexure is preferred and recommended for most characterization purposes. |
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1. Scope | ||||||||||||||||||
1.1 This test method covers determination of the flexural strength of advanced ceramics at elevated temperatures.1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. |
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2. Referenced Documents | ||||||||||||||||||
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Historisch
1.12.2010
Historisch
1.6.2010
Historisch
1.12.2010
Historisch
15.7.2010
Historisch
1.1.2010
Historisch
1.8.2013
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