High Strain Rate Compressive Behavior of Polyurethane Resin and Polyurethane/Al₂O₃ Hollow Sphere Syntactic Foams

Figure 1

(a) The microstructure of the polyurethane/ syntactic foam: (b), (c), and (d) show the interface between an Al₂O₃ hollow particle and the matrix resin at successively increasing magnifications.

(a)

(b)

(c)

(d)