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ASTM C 1834 : 2016

Current
Current

The latest, up-to-date edition.

Standard Test Method for Determination of Slow Crack Growth Parameters of Advanced Ceramics by Constant Stress Flexural Testing (Stress Rupture) at Elevated Temperatures
Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

02-01-2016

CONTAINED IN VOL. 15.01, 2018 Defines the determination of the slow crack growth (SCG) parameters of advanced ceramics in a given test environment at elevated temperatures in which the time-to-failure of four-point -1/4 point flexural test specimens is determined as a function of different levels of constant applied stress.

1.1This test method covers the determination of the slow crack growth (SCG) parameters of advanced ceramics in a given test environment at elevated temperatures in which the time-to-failure of four-point-1/4point flexural test specimens (see Fig. 1) is determined as a function of different levels of constant applied stress. This SCG constant stress test procedure is also called a slow crack growth (SCG) stress rupture test. The test method addresses the test equipment, test specimen fabrication, test stress levels and experimental procedures, data collection and analysis, and reporting requirements.

1.2In this test method the decrease in time-to-failure with increasing levels of applied stress in specified test conditions and temperatures is measured and used to analyze the slow crack growth parameters of the ceramic. The preferred analysis method is based on a power law relationship between crack velocity and applied stress intensity; alternative analysis approaches are also discussed for situations where the power law relationship is not applicable.

Note 1:This test method is historically referred to in earlier technical literature as static fatigue testing (Refs 1-3)2 in which the term fatigue is used interchangeably with the term slow crack growth. To avoid possible confusion with the fatigue phenomenon of a material that occurs exclusively under cyclic stress loading, as defined in E1823, this test method uses the term constant stress testing rather than static fatigue testing.

1.3This test method uses a 4-point-1/4point flexural test mode and applies primarily to monolithic advanced ceramics that are macroscopically homogeneous and isotropic. This test method may also be applied to certain whisker- or particle-reinforced ceramics as well as certain discontinuous fiber-reinforced composite ceramics that exhibit macroscopically homogeneous behavior. Generally, continuous fiber ceramic composites do not exhibit macroscopically isotropic, homogeneous, elastic continuous behavior, and the application of this test method to these materials is not recommended.

1.4This test method is intended for use at elevated temperatures with various test environments such as air, vacuum, inert gas, and steam. This test method is similar to Test Method C1576 with the addition of provisions for testing at elevated temperatures to establish the effects of those temperatures on slow crack growth. The elevated temperature testing provisions are derived from Test Methods C1211 and C1465.

1.5Creep deformation at elevated temperatures can occur in some ceramics as a competitive mechanism with slow crack growth. Those creep effects may interact and interfere with the slow crack growth effects (see 5.5). This test method is intended to be used primarily for ceramic test specimens with negligible creep. This test method imposes specific upper-bound limits on measured maximum creep strain at fracture or run-out (no more than 0.1 %, in accordance with 5.5).

1.6The values stated in SI units are to be regarded as the standard and in accordance with IEEE/ASTM SI 10.

1.7This 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.

Committee
C 28
DocumentType
Test Method
Pages
20
PublisherName
American Society for Testing and Materials
Status
Current

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ASTM C 1161 : 2013 Standard Test Method for Flexural Strength of Advanced Ceramics at Ambient Temperature
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ASTM E 1823 : 1996 : R2002 Standard Terminology Relating to Fatigue and Fracture Testing
ASTM C 1368 : 2010 Standard Test Method for Determination of Slow Crack Growth Parameters of Advanced Ceramics by Constant Stress-Rate Strength Testing at Ambient Temperature
ASTM E 1823 : 1996 : EDT 1 Standard Terminology Relating to Fatigue and Fracture Testing
ASTM C 1145 : 2002 Standard Terminology of Advanced Ceramics
ASTM C 1576 : 2005 Standard Test Method for Determination of Slow Crack Growth Parameters of Advanced Ceramics by Constant Stress Flexural Testing (Stress Rupture) at Ambient Temperature
ASTM C 1211 : 2018 : R2023 Standard Test Method for Flexural Strength of Advanced Ceramics at Elevated Temperatures
ASTM E 1823 : 2012 : REV A Standard Terminology Relating to Fatigue and Fracture Testing
ASTM E 1823 : 2007 Standard Terminology Relating to Fatigue and Fracture Testing
ASTM C 1465 : 2000 : R2006 Standard Test Method for Determination of Slow Crack Growth Parameters of Advanced Ceramics by Constant Stress-Rate Flexural Testing at Elevated Temperatures
ASTM C 1322 : 2015 : R2019 Standard Practice for Fractography and Characterization of Fracture Origins in Advanced Ceramics
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ASTM C 1161 : 1994 : R1996 Standard Test Method for Flexural Strength of Advanced Ceramics at Ambient Temperature
ASTM C 1239 : 2006 Standard Practice for Reporting Uniaxial Strength Data and Estimating Weibull Distribution Parameters for Advanced Ceramics
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ASTM E 1823 : 2012 : REV C Standard Terminology Relating to Fatigue and Fracture Testing
ASTM E 1823 : 2020 : REV B Standard Terminology Relating to Fatigue and Fracture Testing
ASTM C 1211 : 2002 : R2008 Standard Test Method for Flexural Strength of Advanced Ceramics at Elevated Temperatures
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