By D.F. Moore (Auth.)
Viscoelastic desktop components, which surround elastomeric parts (rubber-like components), fluidic parts (lubricating squeeze motion pictures) and their mixtures, are used for soaking up vibration, lowering friction and enhancing power use. Examples
include pneumatic tyres, oil and lip seals, compliant bearings and races, and skinny movies. This booklet units out to teach that those parts could be integrated in computer research, simply as when it comes to traditional components (e.g. gears, cogs, chain
drives, bearings). this can be accomplished through introducing straightforward conception and versions, by way of describing new and validated experimental options for deciding upon viscoelastic homes, and eventually through operating via real examples. 'This very reasonably
priced e-book is stuffed with important details now not on hand from different assets on a subject matter that's the eminent author's speciality.' - commercial Lubrication and Tribology, April 1995
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Additional info for Viscoelastic Machine Elements. Elastomers and Lubricants in Machine Systems
Sample text
This force decreases in time according to how relaxation effects occur within the model. 1 Creep response The problem of creep can be mathematically stated as follows. 31) we require to find the resulting extension <5(/). 31), which has the following values [ 8 ] . 7. 33 b ) The constant of integration in this last equation is zero, since Sit) = 0 at / = 0. 15) gives which after integration shows the following time-dependent response ι ι ß *i. 8. W e note that the Maxwell element has a response equal to the sum of the responses for the viscous and elastic elements - because it consists of these elements in series.
52) See Chapter 7 on 'New Measurement Techniques'. From the theory of Hertz, see Chapter 3 on 'Rolling-contact Machine Elements'. 52 Design of viscoelastic machine elements for constant load, where Ε is the elastic Young's modulus of the elastomer. 15. 52) applies at finite sliding speeds, it is reasonable to suppose that A ; is inversely related to E' in some similar manner. 15, as speed or frequency is raised. 4, while indicating the nature of viscoelastic behaviour, are nevertheless too simplistic to predict accurately material performance.
51), the interchangeability of these factors becomes a reality which greatly extends the range of experimental data obtainable with relatively simple facilities. 8 Stiffening and pressure asymmetry effects One of the remarkable properties of viscoelastic behaviour which has been observed experimentally [13,14] and accounted for theoretically [15] is the stiffening and asymmetry phenomenon which occurs accordingly as frequency is increased. 14. The draping of the elastomer about the symmmetrical surface causes an equally symmetrical pressure distribution as illustrated, where its normal components just match the applied load Wi per asperity.