Multi-axis high-low cycle composite fatigue life prediction method

The invention relates to a multi-axis high-low-cycle composite fatigue life prediction method, which comprises the following steps of: introducing a weight function method into multi-axis high-low-cycle composite fatigue to determine a critical plane orientation; a Wang-Brown multi-axis counting method is used for carrying out cycle counting on the multi-axis high-low cycle composite fatigue load; by analyzing test data and based on a linear criterion, a new model is provided by considering the load interaction influence and is used for predicting the multi-axis high-low cycle composite fatigue life; and based on the determined critical surface and the cycle counting result, carrying out life prediction on the multi-axis high-low cycle compound fatigue by utilizing the proposed life prediction model. The method can accurately predict the service life of the aviation high-temperature material under multi-axis high-low cycle composite fatigue loading, and has important significance for fatigue life design and s