Investigation of the influence of fatigue alternating loading on residual stress in materials

Abstract

This study investigates the effect of pulsating cyclic fatigue loading on the internal stress of silicon steel material. A comparative analysis is conducted between the loaded material and the original material before treatment. The findings indicate that pulsating cyclic fatigue loading leads to a decrease in the residual stress of the material and an increase in its elongation, albeit with a reduction in its strength. Additionally, fatigue alternating loading reduces the roughness of the material and enhances its grain size, resulting in narrower grain boundaries. Transmission electron microscope (TEM) analysis indicates that finite fatigue loading causes an increase in the number of dislocations in the material, leading to local plastic deformation and contributing to the reduction of residual stress in the material. Notably, the mechanism underlying the reduction of residual stress resulting from pulsating cyclic fatigue loading is akin to that of non-temperature-affected residual stress reduction treatment, suggesting a possible similarity in their fundamental nature.

Keywords

• Fatigue alternating loading
• Residual stress
• Material properties
• Microstructure
• Residual stress reduction treatment