Studies of thermal-cycle endurance of heat resistant materials under asymmetric thermomechanical loading

Results of experimental investigation of thermal-cycle endurance of heat resistant materials under conditions of asymmetric thermo-mechanical loading are presented. Using the maximum-likelyhood fit statistical evaluation of the parameters of logarithmically normal distribution of the sample endurance are obtained with an account of the parameter dependence on the level of stresses. A mathematical model of endurance based on the approximation of diagrams of limiting stresses in the case of asymmetric thermo-mechanical loading with the equation of inclined ellipse is suggested. Comparison of the calculated endurance, obtained with an aid of the model with the experiment results is made