Deformation mode in 3-point flexure on pantographic block

Pantographic blocks are metamaterials made of a finite number parallel pantographic sheets interconnected by cylindrical pivots. In this paper, block subjected to 3-point flexure, where the prescribed displacements plane, shows essentially monoclastic deformation (i.e., one principal curvatures top surface is found be negligible wrt. other one). modeled herein with second gradient 3-dimensional continuum model that valid at length scale cells. This reduced order allows for predictive numerical simulations whose computational burden relatively small. Second effects higher-order terms contributing strain energy) limited derivatives along fibers their transverse displacements. Digital Volume Correlation (DVC) techniques employed measure deformed shapes blocks. A model-driven initialization procedure DVC followed quantify shape such in large and strains.