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Schematic 2D representation of an elastic element with different stiffness values of εx and εz along the x and z directions, respectively. An external force F (blue arrow) applied to the tip of the elastic element (orange circle) is equilibrated by the strains Δx and Δz, eliciting the restoring forces (yellow arrows) that balance the component of F along the x (Fx) and z (Fz) directions, respectively (white arrows).
