There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.
. Fatigue surface crack growth is studied through experiments and computations for
aluminum alloys D16T and B95AT (analogue of 2024 and 7075 aluminum). Subjects for
studies are cylindrical hollow specimens with external semi-elliptical surface crack.
The variation of fatigue crack growth rate and surface crack paths behavior was studied
under cyclic loading for different environmental conditions. Uniaxial tension tests
were carried out at low (-60°C), room (+23°C) and high (+250°C) temperature. For the
same specimen configuration and the different crack front position as a function of
cyclic loading and temperatures conditions the distributions of governing parameter
of the elastic-plastic stress fields in the form of In-factor along various crack
fronts was determined from numerical calculations. This governing parameter was used
as the foundation of the elastic-plastic stress intensity factor (SIF). Both elastic
and plastic SIF approach was applied to the fatigue crack growth rate interpretation.
It is found that there is a steady relationship between the crack growth rate and
the plastic SIF in the form of general curve within a relatively narrow scatter band
for all tested specimens at different temperatures.