We present a lattice structure defined by patterns of slits that follow a rotational symmetry (chiral) configuration. The chiral pattern of the slits creates a series of hinges that produce deformation mechanisms for the lattice due to bending of the ribs, leading to a marginal negative Poisson’s ratio. The engineering constants are modelled using theoretical and numerical Finite Element simulations. The results are benchmarked with experimental data obtained from uniaxial and off-axis tensile tests, with an overall excellent agreement. The chiral hinge lattice is almost one order of magnitude more compliant than other configurations with patterned slits and - in contrast to other chiral micropolar media - exhibits an in-plane shear modulus that closely obeys the relation between Young’s modulus and Poisson’s ratio in homogeneous isotropic linear elastic materials.
Zhang, W., Neville, R., Zhang, D., Scarpa, F., Wang, L., & Lakes, R. (2018). The two-dimensional elasticity of a chiral hinge lattice metamaterial. International Journal of Solids and Structures, 141-142, 254-263. https://doi.org/10.1016/j.ijsolstr.2018.02.027