Modification of the algorithm for calculating fatigue life for the criteria based on the concept of the critical plane

The aim of this paper is to propose an algorithm for fatigue life determination with the use of widely-known criteria for the fatigue life considering proper determination of material characteristics, which are a function of the number of cycles to failure. The application of the modified algorithm has been presented within the criteria of Findley, Matake, Papadopoulos and Dang Van, and the results of calculations have been compared with test results for steels S355J2G3 and Ck45. For both materials analysed, the application of the modified algorithm in the fatigue criteria makes it possible to obtain much more precise results of the calculations for all types of the loading analysed.