The fatigue strength of cut and sheared edges is directly influenced by the quality of the cut and the tools used to make it. When materials are cut or sheared, surface imperfections and microcracks may be left on the edges, which can lead to a reduction in fatigue strength. To improve the fatigue strength of cut and sheared edges, it is important to ensure quality assurance and maintenance of the cutting or shearing tools. This can minimize surface imperfections and microcracks that can compromise the fatigue strength of the edges. Additionally, post-processing techniques such as grinding or polishing may be used to further reduce surface roughness and improve fatigue strength.