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Упругопластическая модель роста усталостных поверхностных трещин…
Инженерный журнал: наука и инновации
# 3·2017 15
Elastic-plastic model of fatigue crack growth in the surface
of thick-walled structures under biaxial loading
© К.А. Vansovich
Omsk State Technical University, Omsk, 644050, Russia
The model of surface crack growth in thick-walled elements of structures under the biax-
ial cyclic loading is presented. The dependence of surface crack growth rate on the de-
gree of loading biaxiality is established on the basis of experimental data obtained from
the results of testing cruciform specimens. The strain field in the vicinity of cracks is in-
vestigated taking into account elastic-plastic material properties using the ANSYS pro-
gram. Destruction at the fatigue crack tip is represented as a combination of brittle frac-
ture at the crack tip and ductile fracture in the zone of plastic deformation. The formula
is proposed for determining the rate of fatigue surface crack growth in view of the brittle
and viscous stress parameters at the crack tip. The obtained results allow determining
with greater accuracy the remaining service life of structures with a surface crack in the
case of biaxial loading.
Keywords:
surface crack, biaxial loading, cruciform specimen, finite element method,
brittle and plastic zone, crack growth rate
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