Abstract
We investigated the impact behavior of functionally giaded foam materials (FGFM) having density distribution in compressional direction by performing finite element analysis (FEA) in order to use effectively FGFM as impact absorbing matenal. In the analyses, compressive stress-strain relations depending on the density in the FGFM were linear approximation in three distinct deformation regions: elastic legion, plateau stiess region and densification region. The FEA results revealed that FGFM having high density in near the impacted end can absorb a large amount of impact energy without increasing the maximum fixed end load from that of the homogeneous foam.
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