Impact Response of Aluminium Alloy Foams Under Complex Stress States

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 quasistatic 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.

Experimental and Numerical Study of Ballistic Resistance of Composites Based on Sandwich Metallic Foams

“…The impact of some key parameters on the overall behaviour of the tested materials in terms of energy absorption, such as impact energy, core thickness, core density, and impactor shape, were investigated. Dynamic tests on closed-cell aluminium alloy foams were analysed in the paper [20], where the mechanism of damage for different stress variants was examined by means of quasi-static tests. Damage surfaces under shock load conditions were determined experimentally.…”

Effect of a Multiaxial Load of Reverse Torsion on Open-Cell Aluminum Foams Behavior

“…Doyoyo and Wierzbicki [ 15 ] studied in detail the effect of pore size on the failure behavior of aluminum foam under biaxial loading. Zhou et al [ 16 , 17 , 18 ] used the Arcan test rig. The latter was designed first to study the unidirectional responses of fiber-reinforced composites under multiaxial loading [ 19 ] which consisted of two pairs of semi-circular loading plates to study the fracture behavior of closed-cell aluminum foams under combined shear-compression loading case.…”