Calculation of the Fatigue Limit of High‐Strength Steel Specimens at Different Loading Conditions Based on Inclusion Sizes

A calculation method for the fatigue limit of components made high-strength steels that fail at inclusions is described. The consists two parts: first, size failure-critical determined based on metallographic investigations. Then, expected inclusion sizes using a fracture mechanics model. Influencing factors such as sample size, heat-treatment conditions, and mean stresses are considered. model parameters derived from test data collected over decades within framework several research projects. dominant influencing hardness steel matrix. Finally, used to predict different specimens bearing SAE 52 100. limits calculated with compared evaluated basis found in samples’ surface experimentally limits.