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. |
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Seite 14
... equation ( 2.5 ) holds , there will be a change in the relative normal surface displacement , and hence a change in ... integral equation . P Q X r Ꮎ + σ = ? y 14 CHAPTER 2. BASIC CONTACT MECHANICS.
... equation ( 2.5 ) holds , there will be a change in the relative normal surface displacement , and hence a change in ... integral equation . P Q X r Ꮎ + σ = ? y 14 CHAPTER 2. BASIC CONTACT MECHANICS.
Seite 16
... integral equation we need to find the surface displacements . These may be obtained from equations ( 2.10 ) and ( 2.11 ) by setting = ± π / 2 , and converting to Cartesian coordinates . This gives K 8μ Απμ In 21+ G u = -P P ( 31 ) sga ...
... integral equation we need to find the surface displacements . These may be obtained from equations ( 2.10 ) and ( 2.11 ) by setting = ± π / 2 , and converting to Cartesian coordinates . This gives K 8μ Απμ In 21+ G u = -P P ( 31 ) sga ...
Seite 18
... equation ( 2.16 ) disappears . This simplification applies when no shear tractions arise , i.e. either because that ... integral equations of the first kind ( equation 2.22 ) . In fretting experiments we shall also need to understand ...
... equation ( 2.16 ) disappears . This simplification applies when no shear tractions arise , i.e. either because that ... integral equations of the first kind ( equation 2.22 ) . In fretting experiments we shall also need to understand ...
Seite 19
... integral along the line of the contact : 1 ¤ ( z ) = 2πί - - p ( t ) — iq ( t ) dt t Z contact ( 2.24 ) Here , p ( t ) , q ( t ) are arbitrary traction distributions ; for sliding contacts these variables are related by equation ( 2.1 ) ...
... integral along the line of the contact : 1 ¤ ( z ) = 2πί - - p ( t ) — iq ( t ) dt t Z contact ( 2.24 ) Here , p ( t ) , q ( t ) are arbitrary traction distributions ; for sliding contacts these variables are related by equation ( 2.1 ) ...
Seite 20
... ( equation 2.9 ) in conjunction with equations ( 2.26 ) , ( 2.27 ) we arrive at 2μ ( ди მა + i . = ( z − z ) ... integral to be evaluated analytically . The equation giving the amount of overlap in freely interpenetrating bodies ( fig ...
... ( equation 2.9 ) in conjunction with equations ( 2.26 ) , ( 2.27 ) we arrive at 2μ ( ди მა + i . = ( z − z ) ... integral to be evaluated analytically . The equation giving the amount of overlap in freely interpenetrating bodies ( fig ...
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 |
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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