Viscoelasticity and plasticity mechanisms of human dentin

E. N. Borodin, S. Seyedkavoosi, D. Zaitsev, B. Drach, K. N. Mikaelyan, P. E. Panfilov, M. Yu Gutkin, I. Sevostianov

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Theoretical models of viscoelastic behavior and plastic deformation mechanisms of human dentin are considered. Using the linear viscoelasticity theory in which creep and relaxation kernels have the form of fraction-exponential functions, numerical values of instantaneous and long-time Young’s moduli and other characteristics of dentin viscoelasticity under uniaxial compression are found. As dentin plastic deformation mechanisms, mutual collagen fiber sliding in the region of contact of their side surfaces, separation of these fibers from each other, and irreversible tension of some collagen fibers, are proposed. It is shown that the second mechanism activation requires a smaller stress than that for activating others. The models of plastic zones at the mode I crack tip, which correspond to these mechanisms, are studied. It is shown that the plastic zone size can increase from a few hundreds of nanometers to hundreds of micrometers with increasing applied stress.

    Original languageEnglish
    Pages (from-to)120-128
    Number of pages9
    JournalPhysics of the Solid State
    Volume60
    Issue number1
    Early online date24 Jan 2018
    DOIs
    Publication statusPublished - Jan 2018

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