It is shown in low-velocity impact tests that penetration force depends on the geometry of the impactor and the density of the foam. In the low impact velocity range studied in this research, the effect of the impact velocity on the penetration resistance load is not observed for Rohacell® 51WF. However, a dynamic effect is identified, that is, the impact resistance is lower than quasi-static indentation resistance. This is due to the reduction of the crushed zone beneath the impactor in impact. For Rohacell® 110WF, a slight increase of the resistance force with the increase of impact velocity is observed, which is attributed to the increased strain rate and confinement effects for higher density foams. Analytical models based on experimental observations are proposed to predict the penetration resistance. Parameters in these analytical models have clear physical meanings and can be determined by material tests. Good agreement is observed between analytical predictions and experimental results for both Rohacell® 51WF and 110WF foams.
Low velocity impact on polymeric foams
Journal of Cellular Plastics ; 47 , 1 ; 45-63
2011
19 Seiten, 13 Bilder, 3 Tabellen, 25 Quellen
Aufsatz (Zeitschrift)
Englisch
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