Notch Fatigue Life Prediction Model Considering Stress Gradient Influence Depth and Weight Function

Notch characteristics significantly affect the fatigue performance of engineered components, for which stress gradient effect is worth careful consideration. The traditional analysis method based on Coffin–Manson equation does not take into account influence range regarding definition correction factor, nor high-stress region, has a greater life. To address aforementioned problems, new notch life model proposed in this paper. First, stress–strain field at root analyzed to define depth influence, following low-stress region reduced by weighting function calculation factor. Finally, validate method, three sets experimental data, including TC4, GH4169, and EN8B, were used compared with other models. results demonstrate that predicted lifetimes are all within 2-fold dispersion band, prediction ability better than