Mechanics of Fretting FatigueFailures 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. |
From inside the book
Results 1-5 of 38
Page vi
... geometry - the avoidance of singularities . 7.4 Fretting tests based on the Hertzian contact 158 162 8.1 8 Analysis of crack propagation Introduction . 169 169 9.1 8.2 Analysis of fretting fatigue cracks 8.2.1 Two - dimensional analysis ...
... geometry - the avoidance of singularities . 7.4 Fretting tests based on the Hertzian contact 158 162 8.1 8 Analysis of crack propagation Introduction . 169 169 9.1 8.2 Analysis of fretting fatigue cracks 8.2.1 Two - dimensional analysis ...
Page 1
... geometry of the components is such as to reduce the chances of initiation to a minimum ! This is normally done by avoiding stress raisers such as fillets , keyways , screw threads and abrupt changes of section . All these measures are ...
... geometry of the components is such as to reduce the chances of initiation to a minimum ! This is normally done by avoiding stress raisers such as fillets , keyways , screw threads and abrupt changes of section . All these measures are ...
Page 3
... geometry of the contact itself . The study of plain fatigue has its origins in the analysis of railway axle failures car- ried out by Wöhler in the 1880's , but fretting fatigue was not studied systematically until 1927 when Tomlinson ...
... geometry of the contact itself . The study of plain fatigue has its origins in the analysis of railway axle failures car- ried out by Wöhler in the 1880's , but fretting fatigue was not studied systematically until 1927 when Tomlinson ...
Page 4
... geometry of the contact will be assumed not to affect crack development1 , other than in the way it controls the field variables cited . In a real problem where fretting fatigue is anticipated , such as the flange joint cited earlier ...
... geometry of the contact will be assumed not to affect crack development1 , other than in the way it controls the field variables cited . In a real problem where fretting fatigue is anticipated , such as the flange joint cited earlier ...
Page 5
... geometry , and is independent of load . For contacts of this kind , the presence of burrs or machining imperfections can often have a profound influence on the pressure distribution . Also , singularities are often present at the edges ...
... geometry , and is independent of load . For contacts of this kind , the presence of burrs or machining imperfections can often have a profound influence on the pressure distribution . Also , singularities are often present at the edges ...
Contents
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 |
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Common terms and phrases
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