3.4. Unloading and reloading features of luffa sponge material
4. Comparison with other materials
As a biological material, the experimental data in this paper about luffa sponge material may significantly expand the density range of previously studied natural cellular materials (Gibson et al., 2010) with respect to the strength, as shown in Fig. 13. This special feature provides an opportunity to widen the applications of natural cellular materials in general and the luffa sponge in particular, especially when the light weight is a key design requirement.