Metal material low-cycle fatigue thermal mechanical fatigue life prediction method based on total strain energy and shape coefficient

The invention relates to the technical field of material science and engineering application, in particular to a method for predicting thermal mechanical fatigue life of a metal material based on low-cycle fatigue of total strain energy and a shape coefficient. Firstly, hysteretic energy and total strain energy are calculated through a hysteretic curve, and then corresponding model prediction parameters are obtained through a low-cycle fatigue test by means of normalization of shape coefficients and normalization of complete plastic strain energy and complete total strain energy. And finally, performing thermal mechanical fatigue life prediction by combining the linear relationship between the total strain energy and the fatigue life under the double logarithmic coordinates. According to the method, the thermal mechanical fatigue life can be predicted through the low-cycle fatigue under different mechanical strain amplitudes only by performing two groups of experiments on the low-cycle fatigue and the thermal