Fig. 2: Power-law fit, critical strain, and energy absorption in polymeric foams.
a Quasistatic stress-strain curves, measured experimentally at a strain rate of 0.01 s−1, for various open-cell polymeric foams, fitted with the power-law model up to the critical strain (indicated by red dots). b Critical strain (ϵc) (or onset-to-densification strain) of different polymeric foams plotted as a function of their relative densities \((\bar{\rho })\). Average is taken of five different samples for better accuracy of fit. The error bars represent ± one standard-deviation. c Energy absorbed per unit volume (WL) of different foams, measured up to the critical strain, plotted against the strain rate \((\dot{\epsilon })\). Source data are provided as a Source Data file.
