Abstract
The fatigue crack propagation with unstable behavior of local slip deformation in A1050 and A6061 aluminum under the cyclic tensile loading are investigated. Delay and non-propagation mechanisms of fatigue crack under constant stress amplitude are studied in detail. Results of investigation shown that fatigue crack propagate by mode I in A6061 under the cyclic tensile loading. However, modes of crack propagation in A1050 became mixed mode, which combined with mode I and II being dependent on the testing conditions. Under the some experimental conditions, Delay of crack propagation phenomenon was observed in A1050. Difference of fatigue crack propagation are discussed from the viewpoint of unstable behavior of local multiple-slip deformation.
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