Effect of Relative Density on Compressive Load Response of Crumpled Aluminium Foil Mesh.

David Hughes,Ryan Kennedy,Tannaz Pak,Emeka Amalu

doi:10.3390/ma12234018

Abstract

In recent years, a large number of metal foams and porous metals have been developed. Due to the high cost of these materials alternative manufacturing methods for cellular metallic materials are being explored. Crumpled metallic foil meshes, manufactured via die compression techniques, are evolving as a potential alternative method. However, the non-availability of sufficient data on their load response is limiting their uptake. Uniaxial compressive load response of crumpled aluminium foil meshes (CAFMs) of varying densities, forged by open and closed die compression, are studied. A 0.05 mm thick aluminium sheet mesh, manufactured by the expanded metal process is used. X-ray computed micro-tomography is employed to image the CAFM’s internal cellular structure. The stress-strain relation demonstrates that the CAFMs produce identical load response profile irrespective of their relative density. Power law functions and define the relationships between real Young’s Modulus and effective yield strength, . The study provides new knowledge on the effect of relative density on the compressive properties of CAFMs which have applications across lightweight structural design.

Highlights

The use of cellular materials in the design and fabrication of lightweight, high-value, engineered structures is evolving owing to their impressive mechanical properties and because they weigh a fraction of the solid material they are made of [1]
It can be seen that crumpled aluminium foil meshes (CAFMs) with higher relative density have the relative density
It can be seen that CAFMs with higher relative density have a greater number of a greater number of pores

Summary

Introduction

The use of cellular materials in the design and fabrication of lightweight, high-value, engineered structures is evolving owing to their impressive mechanical properties and because they weigh a fraction of the solid material they are made of [1]. They are used in a wide variety of applications ranging from commercial to military, including automotive, aerospace and construction sectors [2,3]. Cellular materials in general have been the focal point of many facets of research in recent decades, especially for uses as core materials for composite sandwich panels [5]. Recent works concentrate on biomimetics [9], honeycomb structures [10] and entangled materials [11,12]

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