Journal ArticleDOI
Elastic-plastic indentation creep of glassy poly(methyl methacrylate) and polystyrene: characterization using uniaxial compression and indentation tests
TLDR
In this paper, a shallow indentation made by a 750 µm radius steel ball at 25 °C was measured as a time-response to a prescribed loading history of the indenter.Abstract:
This paper discusses the time-dependent mechanical response of poly(methyl methacrylate) (PMMA) and polystyrene (PS) subjected to a shallow indentation made by a 750 µm radius steel ball at 25 °C. The penetration depth was measured as a time-response to a prescribed loading history of the indenter. The tests were performed in the intermediate elastic-plastic regime, which is of paramount importance when dealing with the mechanics of a multicontact interface between rough bodies. The creep characteristics under constant load were analysed with an Eyring law relating the average stress and the strain rate in the deformed volume. The results were compared to data obtained by a standard uniaxial compression test on the bulk material. We have deduced a simple empirical rule which accounts for the heterogeneous stress and strain fields under the indenter and reduces the intricate problem of elastic-plastic indentation creep to an effective scalar rule.read more
Citations
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Journal ArticleDOI
Nanoindentation in polymer nanocomposites
TL;DR: In this article, the authors present a review of the state-of-the-art in the field of instrumented indentation of polymer nanocomposite materials and present challenges and future perspectives in the application of depth-sensing instrumentation to characterize mechanical properties.
Journal ArticleDOI
Nanocharacterization of creep behavior of multiwall carbon nanotubes/epoxy nanocomposite
TL;DR: In this paper, high temperature instrumented indentation testing was used to evaluate the mechanical properties of multiwall carbon nanotubes/epoxy nanocomposite system and the results showed quantifiable differences between the MWCNTs and epoxy specimens.
Journal ArticleDOI
Elasticity and onset of frictional dissipation at a non–sliding multi–contact interface
TL;DR: In this paper, the elastic and dissipative responses of a multicontact interface, formed between the rough surfaces of two contacting macroscopic solids, submitted to a biased oscillating shear force were measured.
Journal ArticleDOI
Modelling indentation creep of polymers: a phenomenological approach
TL;DR: In this article, the authors investigated the room temperature nanoindentation creep behavior of a range of amorphous and semicrystalline polymers and found that experimental data during the first 20 s at constant load were well fitted by a logarithmic equation relating the fractional increase in penetration depth during creep to [A/d(0)]ln(t/τ + 1).
Journal ArticleDOI
Nanoindentation creep and glass transition temperatures in polymers
TL;DR: In this article, the authors investigated the nanoindentation creep behavior of several different polymers in terms of the Chudoba and Richter equation, where the extent of creep e is represented by the extent e = ee ln(ert + 1),w heret is the loading time and ee and er are material constants.
References
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Book
Viscoelastic properties of polymers
TL;DR: In this article, the authors describe the nature of Viscoelastic behavior of polymeric systems and approximate relations among the linear Viscoels and approximate interrelations among the Viscelastic Functions.
Book
The friction and lubrication of solids
Frank Philip Bowden,David Tabor +1 more
TL;DR: Tabor and Bowden as mentioned in this paper reviewed the many advances made in this field during the past 36 years and outlined the achievements of Frank Philip Bowden, and reviewed the behavior of non-metals, especially elastomers; elastohydrodynamic lubrication; and the wear of sliding surfaces.
Journal ArticleDOI
Contact of Nominally Flat Surfaces
TL;DR: In this article, the authors proposed a new theory of elastic contact, which is more closely related to real surfaces than earlier theories, and showed how the contact deformation depends on the topography of the surface, and established the criterion for distinguishing surfaces which touch elastically from those which touch plastically.
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The Mechanics of Earthquakes and Faulting
TL;DR: The connection between faults and the seismicity generated is governed by the rate and state dependent friction laws -producing distinctive seismic styles of faulting and a gamut of earthquake phenomena including aftershocks, afterslip, earthquake triggering, and slow slip events.
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