Fretting fatigue behavior and failure characteristics of 35CrMoA steel under elliptical loading path

Abstract

Purpose This study aims to understand the multiaxial fretting fatigue, wear and fracture characteristics of 35CrMoA steel under the elliptical loading path. Design/methodology/approach By keeping the contact pressure and torsional shear cyclic stress amplitude unchanged; the axial cyclic stress amplitude varied from 650 MPa to 850 MPa. The fretting fatigue test was carried out on MTS809 testing machine, and the axial cyclic strain response and fatigue life of the material were analyzed. The fretting zone and fracture surface morphology were observed by scanning electron microscope. The composition of wear debris was detected by energy dispersive X-ray spectrometer. Findings In this study, with the increase of axial stress amplitude, 35CrMoA steel will be continuously softened, and the cyclic softening degree increases. The fretting fatigue life decreases unevenly. The fretting scars in the stick region are elongated in the axial direction. The area of fracture crack propagation zone decreases. In addition, the results indicate that wear debris in the slip region is spherical and has higher oxygen content. Originality/value There were few literatures about the multiaxial fretting fatigue behavior of 35CrMoA steel, and most scholars focused on the contact pressure. This paper reveals the effect of axial cyclic stress on fretting fatigue and wear of 35CrMoA steel under the elliptical loading path.

Experimental and finite element analysis for evaluating influence of contact pressure on fretting fatigue mechanisms of A319‐T6 cast aluminum alloy

“…4 Fretting fatigue usually leads to a reduction in fatigue strength of structural components by 20% to 80% of that under plain fatigue. 5 Fretting fatigue is one of the most common causes for the failure of various structural components requiring close fit and frequently occurs in bolted joints, 6 riveted joints, 7 spline couplings, 8 dovetails, 9 railway axles, 10 and other engineering assemblies in many industrial sectors including transportation, aerospace, and machinery industries. Due to the tiny relative displacement amplitude during fretting, usually only 1 100 μm, 11 fretting fatigue is prone to be neglected, insidious, and sudden, which may lead to catastrophic accidents.…”

“…In contrast to fretting wear, fretting fatigue is induced by reciprocating local relative displacement in the contact region due to the volumetric deformation of structural components rather than by external vibration 4 . Fretting fatigue usually leads to a reduction in fatigue strength of structural components by 20% to 80% of that under plain fatigue 5 . Fretting fatigue is one of the most common causes for the failure of various structural components requiring close fit and frequently occurs in bolted joints, 6 riveted joints, 7 spline couplings, 8 dovetails, 9 railway axles, 10 and other engineering assemblies in many industrial sectors including transportation, aerospace, and machinery industries.…”