Figure 4.

a) Experimental procedure for characterizing the shape memory behavior of the elastomeric stretchable fibers with a metallic core. The initial length between the grips is l _i. After melting the core, the fiber is then elongated to length l _s. At room temperature, the core freezes and holds the fiber at a length l _f upon releasing the bottom grip. Upon mild heating, the core melts and the fiber returns to a length l _r. Note that after remelting the core, the image shows both the portion of the fiber that was once between the grips and the clamped portion that was once within the grip. b) Shape memory behavior as a function of strain.