Dynamic Compression and Damage Pattern of Hollow Microsphere/Aluminum Alloy Composites

The hollow microsphere/aluminum alloy composites were fabricated by press infiltration. The dynamic compression behavior of the composites was investigated by using split Hopkinson pressure bar (SHPB). The microstructure of the specimen after compression was characterized by scanning electron microscopy, and the damage patterns of the hollow microsphere were primarily studied. A single-cell model of the composites was established, and the dynamic compression process of the single-cell was simulated by using the LSDYNA explicit finite element software. With dynamic loading, mechanical behavior of hollow microsphere/aluminum alloy composites showed three typical stages: elastic deformation, plastic collapse and densification. With the increasing of the decrement, the hollow microsphere appeared cracks along the meridians, gradually transitioned into the fragmentation of the equator, and eventually collapsed.