Mechanics of Fretting FatigueSpringer Science & Business Media, 09.03.2013 - 246 Seiten 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. |
Im Buch
Ergebnisse 1-5 von 48
Seite 5
... stress intensity , which , as it normally occurs at a depth comparable with ... shearing stress , in order to provide the environment for dislocation migration ... shear in inducing mode II loading , and also because it will stabilise and ...
... stress intensity , which , as it normally occurs at a depth comparable with ... shearing stress , in order to provide the environment for dislocation migration ... shear in inducing mode II loading , and also because it will stabilise and ...
Seite 6
... shearing force , and secondly because in sliding mode the amplitude of displacement ... stress needed to cause a dislocation to glide within a grain is a key ... shear traction distri- bution , which may be quite different from that ...
... shearing force , and secondly because in sliding mode the amplitude of displacement ... stress needed to cause a dislocation to glide within a grain is a key ... shear traction distri- bution , which may be quite different from that ...
Seite 7
... stresses . Also , the ideas of fric- tion are ... shear traction . distribution . In Chapter 6 we turn away from the contact itself to the study of any cracks formed . We present methods for the rigorous determination of crack tip stress ...
... stresses . Also , the ideas of fric- tion are ... shear traction . distribution . In Chapter 6 we turn away from the contact itself to the study of any cracks formed . We present methods for the rigorous determination of crack tip stress ...
Seite 12
... force sufficient to cause sliding1 is applied , shearing tractions arise which are everywhere limited by the coefficient of friction , f , i.e. | q ( x , y ) | = −ƒp ( x , y ) ( 2.1 ) where q is the shear stress and p the direct stress ...
... force sufficient to cause sliding1 is applied , shearing tractions arise which are everywhere limited by the coefficient of friction , f , i.e. | q ( x , y ) | = −ƒp ( x , y ) ( 2.1 ) where q is the shear stress and p the direct stress ...
Seite 18
... shear tractions arise , i.e. either because that the contact is frictionless , or because B ( equation 2.18 ) is ... stress field and the surface displacements . For plane problems the most efficient way of deducing these quantities is ...
... shear tractions arise , i.e. either because that the contact is frictionless , or because B ( equation 2.18 ) is ... stress field and the surface displacements . For plane problems the most efficient way of deducing these quantities is ...
Inhalt
5 | |
Contact of spheres the Hertz problem | 31 |
149 | 37 |
Contacts under Partial Slip | 41 |
Advanced Contact Mechanics | 65 |
9 | 101 |
26 | 108 |
41 | 115 |
60 | 149 |
1 | 169 |
Analysis of crack propagation | 175 |
Analysis of crack initiation | 199 |
Conclusions | 215 |
78 | 226 |
83 | 233 |
210 | 235 |
Andere Ausgaben - Alle anzeigen
Häufige Begriffe und Wortgruppen
applied arise asperity contact axi-symmetric behaviour bulk stress bulk tension Chapter coefficient of friction Comninou component compressive configuration constant contact patch contact problems contacting bodies crack faces crack initiation crack length crack propagation crack tip cyclic cylinders Dundurs effect elastically similar experimental Figure finite element finite element method fracture mechanics fretting fatigue fretting fatigue cracks fretting problems geometry given Green's functions half-plane hence Hertzian contact integral equation material Mech Mindlin mode normal load obtained occurs parameter partial slip plain fatigue plane plane strain plasticity possible predict region relative displacement relative slip residual stress shear force shear stress shear traction distribution shear tractions shown in fig singular sliding slip amplitude slip zones solution specimen spheres stick zone strain stress intensity factor surface displacements tangential displacement tangential force tangential loading technique tensile tests zero