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An experimental study of load interaction effects in Al 7475-T7351 is presented. The crack propagation stress intensity factor, KPR, was determined after different overload sequences, also involving subsequent compression loading. The results of these experiments demonstrate that the single overload can be described by a single function, which describes the unloading process after the overload. One main conclusion is that load interaction effects are governed by residual compressive stresses in front of the crack tip, while crack closure plays a minor role.
fatigue crack propagation, load interaction, overload effect, residual stresses, crack closure, compression loading
Research engineer, Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson Air Force Base, OH