M00001224
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ISO 12107 2nd Edition, August 15, 2012 Metallic materials - Fatigue testing - Statistical planning and analysis of data
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Availability date: 07/13/2021
Description / Abstract:
Objectives
This International Standard presents methods for the
experimental planning of fatigue testing and the statistical
analysis of the resulting data. The purpose is to determine the
fatigue properties of metallic materials with both a high degree of
confidence and a practical number of specimens.
Fatigue properties to be analysed
This International Standard provides a method for the analysis
of fatigue life properties at a variety of stress levels using a
relationship that can linearly approximate the material's response
in appropriate coordinates.
Specifically, it addresses
a) the fatigue life for a given stress, and
b) the fatigue strength for a given fatigue life.
The term "stress" in this International Standard can be replaced
by "strain", as the methods described are also valid for the
analysis of life properties as a function of strain. Fatigue
strength in the case of strain-controlled tests is considered in
terms of strain, as it is ordinarily understood in terms of stress
in stress-controlled tests.
Limit of application
This International Standard is limited to the analysis of
fatigue data for materials exhibiting homogeneous behaviour due to
a single mechanism of fatigue failure. This refers to the
statistical properties of test results that are closely related to
material behaviour under the test conditions.
In fact, specimens of a given material tested under different
conditions may reveal variations in failure mechanisms. For
ordinary cases, the statistical property of resulting data
represents one failure mechanism and may permit direct analysis.
Conversely, situations are encountered where the statistical
behaviour is not homogeneous. It is necessary for all such cases to
be modelled by two or more individual distributions.
An example of such behaviour is often observed when failure can
initiate from either a surface or internal site at the same level
of stress. Under these conditions, the data will have mixed
statistical characteristics corresponding to the different
mechanisms of failure. These types of results are not considered in
this International Standard because a much higher complexity of
analysis is required.
Finally, for the S-N case (discussed in Clause 8), this
International Standard addresses only complete data. Runouts of
censored data are not addressed.