Abstract
Functionally graded material (FGM) has great advantages compared with homogeneous material. However, it is prone to occur in delamination failure because of stress concentration. Laser ultrasonic (LU) has many advantages in the detection of complex structural material. Therefore, it is appropriate for the detection of the functionally graded material. In this paper, the finite element method is used to study the laser ultrasonic in TC4/Inconel718 functionally graded material, focusing on the influence of material interfaces and the material component of transition layers on the ultrasound. The results show that material interfaces can increase the amplitude of the Rayleigh wave as well as attenuate and scatter the longitudinal wave and shear wave. The material component of transition layers influences the increased amplitude of the Rayleigh wave indirectly. The velocity of ultrasound in the functionally graded material is reduced with the increase of the propagation depth. This study provides an appropriate method for the detection of the functionally graded material and lays a foundation for the application of laser ultrasonic in it.
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