Figure 1.

Mechanical metamaterial structure of the MST sensor force transfer medium. (A) Schematic of the MST sensor structure with an array of multi-layered blocks. (B) A single block schematic and its spring model analogous. (C) The cross-section of a single block with three layers. (D) Force–displacement plot of a single nominal block and its corresponding stiffness values. (E) 3D model of a unit cell. (F) Tuning parameters of a single unit cell ($\theta$, $t$, $h$) for a given geometrical dimension of the unit cell (Depth, $D$ – Height, $H$ – Width, $W$). (G) FEA and experimental results of a unit cell stiffness for different t values (H-J) Heatmap representation of the FEA results of the nominal unit cell stiffness for different set of tuning parameters.