On the low-cycle fatigue behavior of aluminum alloys under influence of tensile pre-strain histories and strain ratio

The present study attends to the effect of tensile pre-strain histories and strain ratio on cyclic deformation behavior of 6061 aluminum alloy and 2024 aluminum alloy. Low-cycle fatigue tests performed in this study covered two areas; Under fully reversed conditions, with 8% tensile pre-strain, 4% tensile pre-strain, and 0% tensile pre-strain, at strain amplitudes varying in the range 0.6-1.75%; Under strain-controlled circumstances at three different strain ratios [-1, 0, and 0.5] with strain amplitudes varying in the range 0.60-1.75%. The outcomes indicate that the material demonstrates a cyclic strain-softening behavior whose degree rises with rising values of strain ratio and reducing values of strain amplitude. The material demonstrates a non-Masing behavior for higher strain amplitudes amid the interval [1.00%-1.75%]. The material demonstrates a nearlyMasing behavior for lower strain amplitudes amid the interval [0.6%-0.85%]. Under non-zero mean strain, a total relaxation of mean stress is observed at higher strain amplitudes, whereas at lower strain amplitudes, no such behavior is observed.

Automated summary

The present study investigates the influence of tensile pre-strain histories and strain ratio on the cyclic deformation behavior of 6061 aluminum alloy and 2024 aluminum alloy. The results indicate that the material exhibits cyclic strain-softening behavior, with the degree of softening increasing with higher strain ratios and lower strain amplitudes.