Simulation Study on Fracture Mechanism of TiNi Shape Memory Alloy Based on Wavelet Transform

Shape memory effect is a kind of phenomenon that undergoes deformation below a certain critical temperature and can be recovered when heated. The microscopic mechanism of this recovery phenomenon is thermoelastic martensite transformation. In this paper, through a large number of experimental studies and the measurement of various mechanical parameters, the constitutive relation which can describe the deformation of aluminium alloy under different stress states and different strain rates and the damage evolution and failure law of its microstructure are established. This paper is based on WT. In the past 20 years, people have done much research on the characteristics of martensitic transformation in TiNi alloy. The expansion and translation of the wavelet generating function can form a function space, and our goal is to make the best approximation to the original signal in this space according to some standard to separate the original signal from the noise signal. Through the research in this paper, this method has achieved remarkable results and is suitable for being widely used in practice.