110 2. RELIABILITY OF A COMPONENT UNDER CYCLIC LOAD
• When a component is subjected to model #6 cyclic loading spectrum, a series reliability
block diagram is used to calculate the reliability of the component. is is discussed in
Section 2.8.8.
e K-D probabilistic fatigue damage model uses all fatigue test data of the same material
fatigue specimen under different cyclic stress levels to provide a three-parameters distribution
model for describing material fatigue strength. ese three-parameters are m—the slope of the
traditional S-N curves in both log-axis scales,
ln k
0
—the log-mean of and
ln k
0
—the log-
standard deviation of lognormally distributed material fatigue strength index K
0
. When the K-
D model is used to deal with fatigue design of a component under a cyclic loading spectrum, we
can establish a limit state function of a component under any of the six models of cyclic loading
spectrums. erefore, the reliability of component under such cyclic loading spectrum can be
calculated by the definition of reliability, or the H-L method, R-F, or Monte Carlo method.
ese are discussed in Sections 2.9.5–2.9.11.
2.11 REFERENCES
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