Split Hopkinson Pressure bar experiments were performed with Modified Shear Compression Specimens (Dorogoy et al. 2015). The samples were 3D manufactured by Selective Laser Melting out of two different porous metallic materials: aluminium alloy AlSi10Mg and stainless steel 316L. Moreover, high-speed high-resolution in-situ radiography, performed on a high-energy synchrotron beamline at the European Synchrotron Radiation Facility (France) under the Shock-BAG allocation group, was used to obtain time-resolved information of the shape evolution of voids under shear dominated loading. The high-speed x-Ray imaging revealed the role of void softening mechanisms on shear localization and fracture. In addition, selected specimens were characterized by X-ray tomography before and after testing, in order to obtain a 3D reconstruction of the porous microstructure of the samples.