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. 2019 Mar 7;14(3):e0212902. doi: 10.1371/journal.pone.0212902

Fig 4.

Fig 4

a) Boundary periodic load—ionic concentration was modelled as a periodic and discrete distribution; b) The area in which the concentration exceeds the threshold Kth is considered to be destroyed; c) Sketch of ionic concentration in the material with the boundary conditions; d) Path changes chart of the coefficient ks with a specified hysteresis in time.