1. Fig. 1 A hollow polymer fiber filled with solid gallium creates a tough metamaterial core-shell fiber.
A hollow polymer fiber filled with solid gallium creates a tough metamaterial core-shell fiber. (A) Schematic of the metamaterial (Ga-SEBS) fiber being strained. By inducing multiple breaks in the gallium core, the fiber dissipates large amounts of tensile energy at a near-constant rate. (B) Force versus strain for a solid gallium core (black), a hollow SEBS fiber (red), and a Ga-SEBS fiber (blue). (C) Images of a Ga-SEBS fiber from 0 to 350% strain in intervals of 50% strain accompanied by corresponding stress position graphs. The ordinate depicts engineering stress (in MPa; normalized by the initial fiber cross-sectional area), and the abscissa denotes position (in mm/mm; normalized by the initial fiber length) where zero is the leftmost part of the fiber. For scale, the initial fiber length is 27 mm. (D) A close-up image of a fiber at 800% strain. Scale bar, 1 mm. Photo credit: Christopher B. Cooper, North Carolina State University.
Christopher B. Cooper et al. Sci Adv 2019;5:eaat4600
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