Figure 4.

Properties of gelatin‐based tough hydrogel. a) Stress–strain curves of gelatin‐based tough hydrogel. The inset is the stress–strain curve of a hydrogel in the initial state. b) Fatigue resistance of gelatin‐based tough hydrogel. c) Self‐reinforcing properties of gelatin‐based tough hydrogel. d) Ashby image of tensile strength and elongation at break of gelatin‐based tough hydrogel. e) Comparison of tough hydrogel with another representative reported reinforced hydrogel. f) Optical images of hydrogel. g) Comparison of mechanical properties of gelatin‐based tough hydrogel and representative silica‐based PDMS.