PROBLEM TO BE SOLVED: To provide a technique capable of predicting fatigue life with higher accuracy. A fatigue life prediction method includes fatigue test data including test results by a fatigue test under a plurality of conditions for an object, initial defect dimensions of a test piece used in the fatigue test, and test conditions related to the fatigue test. When a stress load exceeding the fatigue limit is applied to the object, the crack grows from the initial defect, and the fatigue limit decreases according to the size of the defect and the crack that grows from the defect. Based on the fatigue test data, the material constant for calculating the amount of crack growth for one stress load is calculated, and for one stress load calculated using the material constant. It includes predicting the fatigue life when a certain stress is applied to an object based on the amount of crack growth. [Selection diagram] Fig. 2
展开▼
