Effect of contact stress on fretting fatigue behavior of 35CrMoA steel
under multiaxial non-proportional paths
This study investigated the fretting fatigue behavior and mechanism of
35CrMoA steel of different contact stresses under diamond and square
loading paths in the form of curved surface contact. The results show
that multiple crack sources will initiate on the subsurface of the
specimen under the combined effect of contact stress and cyclic stress.
Under low contact stress, only one crack source dominates, causing the
instantaneous fracture zone to be biased to the other side of the main
crack source. Under high contact stress, the crack sources in both
fretting zones play a dominant role, making the shape of the
instantaneous fracture zone into a nearly circular shape with better
symmetry; At the beginning of the fretting fatigue, cracks only
propagate in the cross-section where they form. When they propagate to a
certain depth, a component that propagates in the longitudinal direction
will be generated.