Quantifying plasticity-independent creep compliance and relaxation of viscoelastoplastic materials under contact loading
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Ulm_Quantifying plasticity.pdf
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Author(s)
Vandamme, Matthieu
Tweedie, Catherine A.
Constantinides, Georgios
Ulm, Franz-Josef
Van Vliet, Krystyn J.
Date Issued
January 2012
Journal
Journal of Materials Research
Publisher
Cambridge University Press (Materials Research Society)
Citation
Vandamme, Matthieu et al. “Quantifying Plasticity-independent Creep Compliance and Relaxation of Viscoelastoplastic Materials Under Contact Loading.” Journal of Materials Research 27.01 (2011): 302–312. © Cambridge University Press 2011
Version
Final published version
Abstract
Here we quantify the time-dependent mechanical properties of a linear viscoelastoplastic material under contact loading. For contact load relaxation, we showed that the relaxation modulus can be measured independently of concurrent plasticity exhibited during the loading phase. For indentation creep, we showed that the rate of change of the contact creep compliance [dot over L](t) can be measured independently of any plastic deformation exhibited during loading through [dot over L](t) = 2a(t)ḣ(t)/P[subscript max], where a(t) is the contact radius, h(t) is the displacement of the contact probe, and Pmax is the constant applied load during the creep phase. These analytical relations were compared with numerical simulations of conical indentation creep for a viscoelastoplastic material and validated against sharp indentation creep experiments conducted on polystyrene. The derived relations enable extraction of viscoelastic material characteristics, even if sharp probes confer concurrent plasticity, applicable for a general axisymmetric contact probe geometry and a general time-independent plasticity.
MIT Department
Massachusetts Institute of Technology. Department of Civil and Environmental Engineering
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1557/jmr.2011.302
