What can be added to the fracture mechanics of metal fatigue that
has not already been said since the 1900s? From the view point of
the material and structure engineer, there are many aspects of
failure by fatigue that are in need of attention, particularly when
the size and time of the working components are changed by orders
of magnitude from those considered by st traditional means. The 21
century marks an era of technology transition where structures are
made larger and devices are made smaller, rendering the method of
destructive testing unpractical. While health monitoring entered
the field of science and engineering, the practitioners are
discovering that the correlation between the signal and the
location of interest depends on a priori knowledge of where failure
may initiate. This information is not easy to find because the
integrity of the physical system will change with time. Required is
software that can self-adjust in time according to the monitored
data. In this connection, effective application of health
monitoring can use a predictive model of fatigue crack growth.
Earlier fatigue crack growth models assumed functional dependence
on the maximum stress and the size of the pre-existing crack or
defect. Various possibilities were examined in the hope that the
data could be grouped such that linear interpolation would apply.
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