Shock Mitigating Foams. 2. Static/Dynamic Characteristics

Abstract

Using a selection of both commercially available and laboratory synthesised products, the shock mitigating characteristics of semi-rigid foams are systematically evaluated using both compression tests (static) and swinging pendulum tests (dynamic). It is demonstrated how parameters derived from relatively simple static compression tests may be used to predict the maximum deceleration of an impacting object when striking the foams directly. Following a review of the chemical and physical factors likely to influence energy absorption qualities of foams it is tentatively discussed how such factors may be correlated with the material parameters calculated from the static compression tests. In conclusion, the paper points the way forward to how simple static tests may be used to aid the development of foams with specific shock mitigating properties.