Investigation on the Deformation of TiNi Shape Memory Alloy with a Crack Using Moiré Interferometry
Martensitic phase transformation can greatly affect the mechanical behaviors and the stress-strain response of shape memory alloys (SMAs). In this study, the effect of martensitic phase transformation on the deformation of a single-crystal TiNi SMA specimen with a triangle crack was investigated experimentally by means of moiré interferometry method. A typical displacement field and the corresponding strain field in areas both around and far from the tip of the crack were measured in a certain time during the loading process in which the tensile load is coupled with the stress-induced martensitic phase transformation. Some characteristics of the deformation and the martensitic phase transformation of the specimen are revealed. These results may provide a reliable support for revealing the fracture mechanism of single crystal TiNi SMAs, and may enable further development in putting forward the failure criterion of SMAs.
Wei Yang, Mamtimin Geni, Tiejun Wang and Zhuo Zhuang
Q. H. Wang et al., "Investigation on the Deformation of TiNi Shape Memory Alloy with a Crack Using Moiré Interferometry", Advanced Materials Research, Vols. 33-37, pp. 1-6, 2008