Abstract
In this paper the possibility to employ the Digital Image Correlation (DIC) technique for the mechanical behaviour analysis of metallic foam was investigated. Image Correlation allowed to measure displacement and strain fields on closed and open cells aluminium foam specimens under two different loading conditions (compression and shear) and to characterise, with opportune calculation, information on the mechanical behaviour of foams. The adopted technique is suitable to conduct a deep analysis and also to appreciate the local heterogeneities that appear in a specimen during test. The parameters obtained with DIC analysis are confirmed by the global data obtained by testing machine proving the adopted methodology represents a valid tool for the study of these new materials.
Highlights
Aluminium foam constitutes a new class of material having a porous structure that confers them interesting mechanical properties and high potentiality in advanced engineering applications
Every specimen presents a unique ID “X-YY-(Z)-n”, composed by a first letter “X” that indicated the type of test (C for compression, S for shear), two letters “YY” that indicated the type of foam (AL for Alporas and MP for M-pore), for compression test only a letter “Z” indicated the load direction (F for foaming and N for normal), and an increasing numerical index “n”
What firstly emerges is the excellent correspondence between displacement and strain data of MTS and the data extracted from Digital Image Correlation (DIC) analysis
Summary
Aluminium foam constitutes a new class of material having a porous structure that confers them interesting mechanical properties and high potentiality in advanced engineering applications. Cellular structures consist of a solid and a gaseous phases and their cells morphology identifies two types of foams: open and closed cells foam. Metal foams are useful in a variety of applications, due to their unique properties: low density, high strength to weight ratio, high damping capacity, exceptional energy absorption ability, high thermal conductivity, good electrical conductivity and good corrosion resistance. Due to high strength to weight ratios, these materials are appropriate for lightweight structural applications. The applications are yet limited since the mechanical characterisation of these new materials is still insufficient and incomplete. Before potential applications can be realized, a thorough understanding of the mechanical behaviour of these materials is required
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