Mechanics of Fretting Fatigue
Failures of many mechanical components in service result from fatigue. The cracks which grow may either originate from some pre-existing macroscopic defect, or, if the component is of high integrity but highly stressed, a region of localized stress concentration. In turn, such concentrators may be caused by some minute defect, such as a tiny inclusion, or inadvertent machining damage. Another source of surface damage which may exist between notionally 'bonded' components is associated with minute relative motion along the interface, brought about usually be cyclic tangential loading. Such fretting damage is quite insidious, and may lead to many kinds of problems such as wear, but it is its influence on the promotion of embryo cracks with which we are concerned here. When the presence of fretting is associated with decreased fatigue performance the effect is known as fretting fatigue. Fretting fatigue is a subject drawing equally on materials science and applied mechanics, but it is the intention in this book to concentrate attention entirely on the latter aspects, in a search for the quantification of the influence of fretting on both crack nucleation and propagation. There have been very few previous texts in this area, and the present volume seeks to cover five principal areas; (a) The modelling of contact problems including partial slip under tangentialloading, which produces the surface damage. (b) The modelling of short cracks by rigorous methods which deal effectively with steep stress gradients, kinking and closure. (c) The experimental simulation of fretting fatigue.
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Basic Contact Mechanics
Contacts under Partial Slip
Advanced Contact Mechanics
Mechanics of Surfaces
The Analysis of Cracks
Fretting Fatigue Tests
Analysis of crack propagation
Analysis of crack initiation
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analysis applied arise asperity contact axi-symmetric behaviour bulk stress bulk tension Chapter closure coefficient of friction components compressive configuration constant contact geometries contact patch contact problems contacting bodies crack faces crack growth rate crack initiation crack length crack propagation damage described effect elastically similar element method experimental finite element finite element method fracture mechanics fretting fatigue fretting problems geometry give given half-plane hence Hertzian contact influence function integral equation intensity factor range linear elastic material Mindlin mode normal load obtained occurs parameter partial slip plain fatigue plane plane strain plasticity possible predict region relative displacement relative slip residual stress rigid shear force shear stress shear traction distribution shown in fig singular sliding slip amplitude slip zones solution specimen stick zone stress intensity factor surface displacements surface roughness tangential displacement tangential force tangential loading technique tensile tensile stress tests zero