Fig. 7: Density and modulus curves of material samples across varying constituent ratios.
From: Deep-subwavelength ultra-low and ultra-broadband acoustic-black-hole metamaterials
a Measured density power-law material R1–ρ curve. b–h Measured R2-E curves for samples with different densities: b ρ = 2000 kg/m3, R1 = 0.95, c ρ = 3000 kg/m3, R1 = 2.11, d ρ = 4000 kg/m3, R1 = 3.41, e ρ = 5000 kg/m3, R1 = 5, f ρ = 5500 kg/m3, R1 = 6.61, g ρ = 6500 kg/m3, R1 = 8.59, h ρ = 7500 kg/m3, R1 = 11.
