Abstract
A series of dynamic tests were conducted on a closed-cell aluminum alloy foams in order to determine experimental failure surface under impact loading conditions. Quasi-static tests have also been performed to investigate failure mechanism under different stress paths. Three typical types of deformation modes can be observed, which corresponds to the different failure mechanism. The failure loci of the foam in principal stress plane are explored from quasi-static to dynamic loading conditions. A significant strength enhancement is identified experimentally. The expansion of the failure locus from the quasi-static to the dynamic test is almost isotropic. A modified failure criterion for the metallic foam is proposed to predict failure locus as a function of strain rate. This rate-dependence failure criterion is capable of giving a good description of the biaxial failure stresses over a wide range of the strain rates.
Highlights
Sandwich structures are widely used in various engineering applications such as protective structures of autos and aircrafts, due to their excellent energy absorption capability, high specific strength and superior shock-resistance characteristics under such extreme loading as blast or ballistic impact (Ashby et al, 2000; Lu and Yu, 2003; Gibson and Ashby, 1997; Djamaluddin et al, 2015).666 Z
The goal of the present study is to model accurately the mechanical behavior of the aluminum alloy foam under different stress paths, especially multiaxial impact loading conditions
Multiaxial tests have been performed on the foam over a wide range of strain rates in order to study multiaxial failure behavior under combined stress paths
Summary
Sandwich structures are widely used in various engineering applications such as protective structures of autos and aircrafts, due to their excellent energy absorption capability, high specific strength and superior shock-resistance characteristics under such extreme loading as blast or ballistic impact (Ashby et al, 2000; Lu and Yu, 2003; Gibson and Ashby, 1997; Djamaluddin et al, 2015).666 Z. Metallic foams as well as the other cellular materials are used increasingly in engineering applications such as energy absorbers and the cores of sandwich panels due to superior properties like high specific strength, high specific stiffness and high energy dissipation capacity. In these applications, metallic foams may be subjected to multiaxial loadings. It is necessary to develop an understanding of mechanical properties for metallic alloy foams under multiaxial stress states. The goal of the present study is to model accurately the mechanical behavior of the aluminum alloy foam under different stress paths, especially multiaxial impact loading conditions
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