A mechanical model of cellular solids for energy absorptionWednesday (08.11.2017) 15:00 - 15:20 Part of:
Several phenomenological models of the stress-strain characteristics of foams have been proposed in the recent years. In  the authors identified a very promising model able to describe the whole compression behavior, from small values of strain to densification, for several types of polymeric foams such as EPP and EPS. The authors also identified the influence of the density on the material parameters to obtain a generic model of foams for design purposes and material selection.
More recently Jeong et al.  proposed a modification of the previously discussed model to include the effect of the strain-rate on the foam stress-strain characteristics.
The proposed work will analyze some different aluminum based and polymeric foams largely known and used for energy absorption in terms of the previously discussed models. Experimental tests in compression in various loading conditions will be used to identify the proposed models to obtain an even more comprehensive and generic model for the considered structural foams. This will constitute a valuable tool for design of components devoted to the energy absorption in crash events and packaging for the protection of goods.
 M. Avalle, G. Belingardi and A. Ibba, Mechanical models of cellular solids: Parameters identification from experimental tests, International Journal of Impact Engineering, 34 (2007) 3-27
 K.Y. Jeong, S.S. Cheon and M.B. Munshi, A constitutive model for polyurethane foam with strain rate sensitivity, Journal of Mechanical Science and Technology 26 (7) (2012) 2033-2038