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2 results

  • 15 - Hypoplasticity

  • Dimitrios Kolymbas, University of Innsbruck
  • Book:
    A Primer on Theoretical Soil Mechanics
    Published online:
    14 July 2022
    Print publication:
    04 August 2022, pp 109-112

  • Summary

    Hypoplasticity as an alternative to elastoplasticity theory is introduced. The description of irreversibility with non-linear rate equations is explained, and the incremental non-linearity is elucidated. The emergence and development of hypoplasticity is discussed together with its links to elastoplasticity.

  • Time-Dependent Poiseuille Flows of an Elasto-Viscoplastic Fluid with Hypoplastic Effects

  • C. Fang
  • Journal:
    Journal of Mechanics / Volume 25 / Issue 4 / December 2009
    Published online by Cambridge University Press:
    05 May 2011, pp. 421-431
    Print publication:
    December 2009

  • An evolution equation for the Cauchy stress tensor is proposed, taking into account the elastic, viscous and plastic characteristics of complex fluids. Hypoplasticity, in particular, is incorporated to model the plastic features. The model is applied to investigate time-dependent Poiseuille flows between two parallel plates to simulate non-Newtonian behavior of complex rheological fluids. Results show that while different degrees of elastic and viscous features can be indexed by varying the values of the model parameters, hypoplasticity is capable of simulating the plastic characteristics. The fluid tends to be divided into different parallel layers as hypoplastic effects enhance gradually. Applications of the model may be found in geomorphic fluid motions involved granular materials.