Combined effect of residual and mean stresses on fatigue behavior of welded aluminum 2024 alloy
Source abstract
Abstract
Abstract In this study, high cycle fatigue behavior of friction stir welded aluminum 2024 alloy was investigated at different mean stresses. Complexity in the microstructure and tensile residual stress in the weld zone had a significant impact on the fatigue behavior of the welded joints. Apparent increase in mean stresses due to tensile residual stresses, decreased the fatigue lives of the welded joints. Increase in R-ratio from -1 to 0.1 resulted in significant depreciation of fatigue lives and endurance limit, while it was marginal when increased further to 0.5, thus suggesting the probable saturation of the detrimental mean stress effect. A shift in crack nucleation sites with a change in applied load amplitudes was observed. Hardening precipitates re-appeared across the weld section after heat-treatment of the welded joints thus hindering the movement of dislocations and stabilizes the grain boundary, thereby resulting in improvement of the fatigue lives. All these observations were attributed to the combined effect of mean stresses, residual stresses and the microstructural barriers, and are discussed.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced Welding Techniques Analysis · Aluminum Alloys Composites Properties · Welding Techniques and Residual Stresses
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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