Fig. 3: Investigation of crack characteristics.
From: A deep-learned skin sensor decoding the epicentral human motions
a Electrical response while initial cracking (left) and sensor operation (right). b Schematic illustration and modeling parameters of displacement controlled bending environment. c The initial cracking resistance changes of the sensors prepared by different laser power with model-fitting curve. d Schematic representation of sintered particle layer and SEM image of the cross section of annealed (right) and non-sintered (left) particle layer. Scale bar, 40 μm. e–g Energy release rate curve and resistance function of “non-cracking” (e), “stable cracking” (f), and “unstable cracking” (g). Arrow at the bottom describes the increasing direction of electrical conductivity (blue) and degree of crack (gray). h–j Crack appearance for each regime, “non-cracking” (h), “stable cracking” (i), and “unstable cracking” (j). The first row indicates the schematic of crack length and the second shows the SEM images respect to each case. Scale bar, 14 μm. k The operating output resistance of the sensors prepared by different laser power.
