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ASTM C 1576 Document Information:
Title
Standard Test Method for Determination of Slow Crack Growth Parameters of Advanced Ceramics by Constant Stress Flexural Testing (Stress Rupture) at Ambient Temperature
ASTM International
Publication Date:
Jun 1, 2005
Scope:
This test method covers the determination of slow crack growth (SCG)
parameters of advanced
ceramics by using constant stress flexural testing in which time to
failure of flexure test
specimens is determined in four-point flexure as a function of
constant applied stress in a given
environment at ambient temperature. In addition, test specimen
fabrication methods, test stress
levels, data collection and analysis, and reporting procedures are
addressed. The decrease in time
to failure with increasing applied stress in a specified environment
is the basis of this test
method that enables the evaluation of slow crack growth parameters of
a material. The preferred
analysis in the present 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 - The method in this test method is frequently referred to as
static fatigue or
stress-rupture testing (1-3)(Footnote 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 loading, as defined in Terminology E
1823, this test method uses
the term constant stress testing rather than static fatigue testing.
This test method 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, continuous
behavior, and the application of
this test method to these materials is not recommended.
This test method is intended for use with various test environments
such as air, other gaseous
environments and liquids.
The values stated in SI units are to be regarded as the standard and
in accordance with IEEE/ASTM
SI 10 Standard.
This test method may involve hazardous materials, operations, and
equipment. This standard does not
purport to address all of the safety concerns 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.
Footnote 2 - The boldface numbers in parentheses refer to the list of
references at the end of this
standard.
Keywords:
- advanced ceramics
- constant stress testing
- flexural testing
- four-point flexure
- slow crack growth
- slow crack growth parameters
- time to failure
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