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Author: D.A. Hills
Publisher: Springer Science & Business Media
ISBN: 9401582815
Category : Technology & Engineering
Languages : en
Pages : 251
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Book Description
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.
Author: D.A. Hills
Publisher: Springer Science & Business Media
ISBN: 9401582815
Category : Technology & Engineering
Languages : en
Pages : 251
Get Book Here
Book Description
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.
Author: Tomasz Liskiewicz
Publisher: Elsevier
ISBN: 0128240970
Category : Technology & Engineering
Languages : en
Pages : 656
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Book Description
Fretting Wear and Fretting Fatigue: Fundamental Principles and Applications takes a combined mechanics and materials approach, providing readers with a fundamental understanding of fretting phenomena, related modeling and experimentation techniques, methods for mitigation, and robust examples of practical applications across an array of engineering disciplines. Sections cover the underpinning theories of fretting wear and fretting fatigue, delve into experimentation and modeling methods, and cover a broad array of applications of fretting fatigue and fretting wear, looking at its impacts in medical implants, suspension ropes, bearings, heating exchangers, electrical connectors, and more. - Covers theoretical fundamentals, modeling and experimentation techniques, and applications of fretting wear and fatigue - Takes a combined mechanics and materials approach - Discusses the differences and similarities between fretting wear and fretting fatigue as well as combined experimental and modeling methods - Covers applications including medical implants, heat exchangers, bearings, automotive components, gas turbines, and more
Author: William John Harris
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: W.J. Harris
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: W. J. Harris
Publisher:
ISBN:
Category : Fretting corrosion
Languages : en
Pages : 24
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Book Description
A recapitulation of the characteristics of the fretting fatigue phenomenon described in AGARD Advisory Report No. 8, with a re-appraisal of the theory of the basic mechanism in the light of recent research, tend to confirm the significance of the residual tensile stress field remanent after plastic compression of the asperities, the analysis of the fatigue results indicating that, the sensitivity of fretting fatigue to the contact pressure is similar to the 'notch sensitivity' of the material, by microscopical studies, the nucleation of fretting fatigue cracks near the plastic zones surrounding the scars and, their propagation along 45 degrees planes rather than normal to the fatigue stress axis, and that the modest target of achieving 'anti-fret' resistance up to 150 degrees C (suitable for Mach 2.2 civil aircraft) can be met by the use of 'cured' polymeric - MoS2 films interposed between the contact faces. (Author).
Author: W.J. Harris
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Steven E. Kinyon
Publisher: ASTM International
ISBN: 0803134568
Category : Contact mechanics
Languages : en
Pages : 445
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Book Description
Contains 29 contributions drawn from the Third International Symposium on Fretting Fatigue held in Nagaoka, Japan in May 2001. Sections of the volume address fretting wear and crack initiation; fretting fatigue crack and damage; life prediction; fretting fatigue parameter effects; loading condition
Author: William John Harris
Publisher:
ISBN:
Category : Fretting corrosion
Languages : en
Pages : 18
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Book Description
Anti-fret treatments such as surface coating with epoxy resins loaded with molybdenum disulphide (MoS2), anodising, shot peening and nickel diffusion are described in some detail. The fretting fatigue properties of Aluminium Alloys D.T.D. 5070A, RR. 58, Titanium Alloys I.M.I. 230, I.M.I. 318A and I.M.I. 685 and the influence of different surface treatments are shown for temperatures ranging from ambient up to 500C. (Author).
Author: W. J. Harris
Publisher:
ISBN:
Category : Metals
Languages : en
Pages : 11
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Book Description
Author: W. J. Harris
Publisher:
ISBN:
Category : Fretting corrosion
Languages : en
Pages : 48
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Book Description
The intrusion of fretting fatigue in the field of flight structures has been responsible, in many cases, for the high strength reduction factors, of 10 or more, commonly encountered. Consequently, a primary objective of the report was to consider the evidence to support the claim that fretting must be ranked in importance with geometric stress concentration and the like, when considering the fatigue behaviour of structures. Thus, Mean Structures Curves, Crack Propagation And Non-Propagating Cracks and some Fundamental Fretting Fatigue Researches have been described and interpreted with the elucidation of the fretting fatigue mechanism in mind. A survey of certain Anti-Fret Techniques has been included not only to emphasize the gains to be made in terms of structural efficiency but to justify the main thesis that Primarily, the fretting fatigue mechanism is controlled by the stress fields generated by the contact of two surface topographies. (Author).
