Uneven surface roughness‌: Uneven shot blasting can lead to inconsistent surface roughness of the workpiece. Local areas may be too rough, while other areas are not rough enough. Excessive surface roughness will increase stress concentration, thereby reducing the fatigue life of the workpiece. ‌

‌Uneven stress distribution‌: Uneven shot blasting can lead to uneven stress distribution on the workpiece surface. Local areas may produce large residual stress, while other areas have less stress. This uneven stress distribution can make the workpiece more susceptible to fatigue damage during use. ‌

‌Reduced material fatigue life‌: Uneven shot blasting can lead to uneven roughness and stress distribution on the workpiece surface, thereby affecting the fatigue life of the material. Excessive shot blasting in local areas can cause microcracks and stress concentration, thereby reducing the fatigue life of the entire workpiece. ‌