Viscoelasticity and plasticity mechanisms of human dentin |
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| Authors: | E N Borodin S Seyedkavoosi D Zaitsev B Drach K N Mikaelyan P E Panfilov M Yu Gutkin I Sevostianov |
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| Institution: | 1.Institute of Natural Sciences,Ural Federal University after the first President of Russia B.N. Yeltsin,Yekaterinburg,Russia;2.Chelyabinsk State University,Chelyabinsk,Russia;3.Institute of Problems of Mechanical Engineering,Russian Academy of Sciences,St. Petersburg,Russia;4.Department of Mechanical and Aerospace Engineering,New Mexico State University,Las Cruces,USA;5.Peter the Great Saint-Petersburg Polytechnic University,St. Petersburg,Russia;6.ITMO University,St. Petersburg,Russia |
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| 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. |
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