Study on fracture behavior of NiTi Alloy by the digital image correlation method

7th Global Conference on Materials Science and Engineering

工业技术（总论）;材料科学

Ma, L.Y.^1 ; Li, Y.J.^1 ; Han, G.^1

School of Civil Engineering and Architecture, University of Jinan, Jinan

250022, China^1

关键词: Digital image correlation methods;    Fracture behavior;    Fracture mechanics approach;    Fracture property;    NiTi alloys;    Stress intensity factor (SIF);    Stress values;    Superelasticity;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/474/1/012053/pdf
DOI  :  10.1088/1757-899X/474/1/012053

来源: IOP

【 摘 要 】

Due to its unique super-elasticity and shape memory effect, NiTi alloy has been widely used in aerospace, civil engineering, and other fields. As it is well known, the defect of the material itself will affect its mechanical properties and service life, especially the fracture properties. To study the influence of the defect on the fracture properties of NiTi alloy, in this paper, the relationships between the stress intensity factor (SIF), stress values, and the number of fitting terms of two different NiTi alloys are investigated within the framework of fracture mechanics approach. The results obtained strongly indicate that SIF values of two specimens with different defects gradually increase with the stress; when the number of fitting terms reaches 8, the error is stable within 2%. Moreover, the SIF in both specimens tends to be stable with the increase in the number of fitting terms.