Abstract
The influence of strain ratio on bending fatigue properties of TiNi shape-memory alloy thin wires and the process of fatigue crack growth were investigated. The results obtained are summarized as follows. (1) The maximum bending strain of fatigue limit is the martensitic-transformation starting strain. (2) The plane-bending low-cycle fatigue life curve is expressed by a power function between maximum strain ε_max and the number of cycles to failure. The smaller the strain ratio, the shorter the fatigue life.
