Abstract
The strain rate sensitivity of various relative densities, open-cell
aluminum alloy foams fabricated by a powder metallurgical method
is investigated under compression loading. Their response to strain
rate has been tested over a wide range of strain rates, from 10-3
to 2600 s-1 at room temperature. Within this range, the experimental
results show that the yield strength and the energy absorbed increase
with an increase of strain rate. However, the yield strength of higher
relative density foams increases bilinearly with the logarithm of
strain rate, and the yield strength of lower relative density foams
shows only a linear increase. The compaction strain slightly decreases
with an increase of strain rate. The higher relative density aluminum
alloy foams are more sensitive to strain rate than the lower relative
density foams.
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