Tunable Mechanical Response in Biholar Elastic Media

We probe the mechanics of 2D and 3D elastic media that are structured with arrays of holes of two different sizes. Hole size ratio plays a crucial role for the mechanical response - allowing to tune the Poisson ratio and qualitative response of the material under uniaxial loading. Biaxial and triaxial loading of these biholar structures leads to a wealth of new phenomena, including mechanically switchable hysteresis and memory effects.