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.