Pressures in periodic foams

An overview of the mechanical properties of foams and periodic lattice materials

Metallic foams and lattice materials are compared in terms of properties and underlying deformation mechanisms. Lattice materials can be made to possess mechanical properties which are similar to, or exceed, those of foams depending upon the nodal connectivity. Scaling laws are reviewed here for the Young’s modulus and yield strength of foams and lattice materials, and the damage tolerance of e...

Simulation of Thermal Transport in Open-Cell Metal Foams: Effect of Periodic Unit Cell Structure

Diffusive transport of light in three-dimensional disordered Voronoi structures.

The origin of diffusive transport of light in dry foams is still under debate. In this paper, we consider the random walks of photons as they are reflected or transmitted by liquid films according to the rules of ray optics. The foams are approximately modeled by three-dimensional Voronoi tessellations with varying degree of disorder. We study two cases: A constant intensity reflectance and the...

Fabrication and Mechanical Properties of Carbon Nanotube Composite Microtrusses

Metallic foams and periodic cellular structures have been investigated widely for energy absorption, thermal management, vibration damping, and structural load support applications [1, 2]. Periodic microtruss geometries, which comprise angled solid members that connect at node points, have been of interest because careful control of their geometry and periodicity [3-5] enables high stiffness, s...

Prediction of Pressure Losses in Pipe Flow of Aqueous Foams

This paper presents a model for predicting pressure losses in foams of various expansions and pressures, in pipes of any given diameter, once the foam behavior has been characterized at a single expansion and pressure. The model incorporates a modified form of the power-law viscosity model of foam, which is obtained through the method of volume equalization. Since apparent wall slip contributes...