The high strain compression of micro- and nano-sized random irregular honeycombs

Abstract

This paper investigates the effects of cell wall thickness, initial stress/strain, and cell regularity on the high strain compressive responses of micro-and nano-sized low density random irregular honeycombs. The strain gradient effects at the micrometer scale, and the surface elasticity and initial stress effects at the nanometer scale are incorporated into the dominant deformation mechanisms in finite element simulations. It is found that the dimensionless compressive stress strain relation strongly depends on the thickness of the cell walls at the micron scale, and at the nano-meter scale, this relation is not only size-dependent, but are also tunable and controllable over a large range. It is also found that under high strain compression, the Poisson's ratios of microand nano-sized low density random irregular honeycombs strongly depend on the cell regularity, but are almost independent of the cell wall thickness and the amplitudes of the initial stress or strain.

Effects of cell aspect ratio and relative density on deformation response and failure of honeycomb core structure

“…The properties and behavior of the HC core are dictated by the density and anisotropy of the cell wall material. However, some significant properties of the HC core are strongly influenced by the honeycomb cell geometry, particularly the shape and size of the cell, and the wall thickness [9,10]. Consequently, the interaction of these geometrical parameters and the density of the wall material in defining the properties of the HC core should be established.…”