Quantifying plasticity-independent creep compliance and relaxation of viscoelastoplastic materials under contact loading
Author(s)Vandamme, Matthieu; Tweedie, Catherine A.; Constantinides, Georgios; Ulm, Franz-Josef; Van Vliet, Krystyn J.
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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.
DepartmentMassachusetts Institute of Technology. Department of Civil and Environmental Engineering; Massachusetts Institute of Technology. Department of Materials Science and Engineering
Journal of Materials Research
Cambridge University Press (Materials Research Society)
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
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