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Abstract

Two cracks, initiated from the opposite tips of a 45° inclined central notch, were considered in cruciform specimens
made of Ti6246. A static load was applied along one arm of the specimen and a cyclic load (R=−1) was
applied along the other arm. Crack propagation was carefully monitored by optical means for different ratios of
static to cyclic load. The observed crack propagation was simulated using two numerical tools, involving two
different mixed-mode crack propagation prediction methods. The experimental evidence shows that there is a
switch in crack propagation direction from orthogonal to the cyclic load at low static load levels to orthogonal to
the static load for high static load levels. Both numerical procedures were able to predict this switch, albeit at
slightly different static to cyclic load ratios.

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