October_AMP_Digital

A D V A N C E D M A T E R I A L S & P R O C E S S E S | O C T O B E R 2 0 2 0 4 3 Fig. 4 — Coupled functional and structural fatigue of NiTi SMA wires: (a) Fracture surface with crack initiation sites indicated by arrows; (b) skin surface of the fractured wire showing high density of small micro-cracks. SMJ HIGHLIGHTS (a) (b) 1 3