The model of the residual life time estimation of tribojoint elements by formation criteria of the typical contact fatigue damages

A new approach for evaluating the resistance of wheel steel to spall formation

“…The curve describing workability of hightempered 65Г steel at rolling contact fatigue conditions has a sloping descending appearance (Fig. 5), qualitatively similar to the model lowtempered steel 75ХГСТ [13]. However, it should be noted that fracture of 65Г steel requires much more loading cycles, which indicates its higher crack growth resistance at contact fatigue than 75ХГСТ steel.…”

“…where v -crack growth rate, v0 and q -parameters indicating the symmetry center and the inclination angle of the middle section of the S-curve respectively. For theoretical study the known mathematical model [13] was used. According to this model, the damaged body is modeled as an elastic half-plane with an edge crack, and the action of counterbody as normal contact pressure with the Hertz force distribution.…”

“…That is a main reason why the new alternative theoretical and experimental approaches that would not require complex fatigue testing of model wheels are needed. Based on literature survey [11][12][13], we can formulate the main stages of the further research as following:  Building the fatigue crack growth rate curves of steels at normal tension and transverse shear and cyclic crack growth resistance characteristics determination.  Choosing the parameters of contact interaction of rolling bodies for theoretical studies taking into account the real service conditions.…”