Fretting Fatigue Experiment and Analysis of AlSi9Cu2Mg Alloy

Abstract

An investigation was carried out in order to study the fretting fatigue behavior of an AlSi9Cu2Mg aluminum alloy. The fretting fatigue tests of AlSi9Cu2Mg were performed using a specially designed testing machine. The failure mechanism of fretting fatigue was explored by studying the fracture surfaces, fretting scars, fretting debris, and micro-hardness of fretting fatigue specimens using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and micro Vickers hardness test techniques. The experimental results show that the fretting fatigue limit (42 MPa) is significantly reduced to approximately 47% of the plain fatigue limit (89 MPa) under 62.5 MPa contact pressure. Furthermore, the fretting fatigue life decreases with increasing alternating stress and increasing contact pressure. The examination results suggest that the stress concentrates induced by oxidation-assisted wear on the contact interface led to the earlier initiation and propagation of crack under the fretting condition.

Effect of contact stress on fretting fatigue behaviour of 35CrMoA steel under multiaxial nonproportional paths

“…A number of researchers have focused on the oxidation of wear debris during fretting fatigue. Wang et al 1 had reported the chemical composition of fretting debris of AlSi9Cu2Mg Alloy. Peng et al 16 had analysed the oxidation degree of the sample's loading side, centre position and fixed side, respectively, and found that the oxidation was uneven.…”

“…A number of researchers have focused on the oxidation of wear debris during fretting fatigue. Wang et al 1…”

“…Fretting refers to the very small relative displacement (in the order of microns, usually 5-50 microns) between contact couples under certain contact stress. [1][2][3] Fretting fatigue is an accelerated failure process under the combined action of fretting wear and cyclic stress. 4,5 In many practical engineering applications, such as the aerospace industry, 6 the machinery industry 7 and the transportation industry, 8 there are inevitable vibrations and small relative movement between different contact parts of components.…”

“…Fretting refers to the very small relative displacement (in the order of microns, usually 5–50 microns) between contact couples under certain contact stress 1–3 . Fretting fatigue is an accelerated failure process under the combined action of fretting wear and cyclic stress 4,5 .…”

Fretting Analysis of Aluminium 6061 Reinforced With Graphene

“…[2] Jun Wang et. al [1] explained that fretting is induced by vibrations or the application of bulk fatigue stresses to one or both of the contacting parts. It widely occurs at the interface of the contact between two parts when there is small amplitude oscillatory relative movement at typically 5-50(µms) micrometers, such as cables in overhead conductors and mine hoists, riveted joints, prostheses, dovetail roots of compressor blades in aircraft engines, etc.…”