Abstract
The present study investigates the impact of different tensile pre-straining (equi-biaxial and uniaxial) on the tensile, high cycle and notch fatigue behaviour of AA2024-T4. EBSD examination of the pre-strained specimen shows more substantial lattice distortion than the material with 0% pre-strain. Pre-strained specimens exhibit increased ultimate tensile strength, yield stress, and reduced ductility, irrespective of pre-straining paths. Moreover, a significant enhancement in fatigue performance is observed, with a 13% and 21% improvement in fatigue strength for uniaxial and equi-biaxial pre-strain, respectively, at an optimal fatigue lifetime of approximately 1 × 106 cycles. The theory of critical distance is utilized to predict fatigue life with double-edge semi-circular notches for each pre-strained condition, and predicted life falls within a scatter band ± 2.
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