Abstract
Detection of Unbonded Defect under Surface of Material Using Phase Information of Rayleigh and A0 Mode Lamb Waves
Highlights
In recent years, to improve the strength of a material, a layered structure is sometimes formed
If stress is concentrated in unbonded areas, the strength of the material will decrease and the material may break.[1,2,3,4,5] The ultrasonic pulse method has been widely used as a nondestructive inspection method for materials and structures.[6,7] In this method, the probed surface has a finite size, and it is often probed by an ultrasonic probe having a size much larger than the wavelength of an ultrasonic wave and the size of a defect
It is considered that the phase rotation with respect to the propagation distance is different because the propagation velocity of the A0 Lamb wave decreases in the unbonded area and a phase difference Δφ of the sound wave is assumed to occur.[19]. The phase rotation becomes smaller at the defect, and the phase difference Δφ obtained by subtracting the regression line value from the phase spectrum value at the same x position becomes a downward-sloping curve in the defect area as shown in Figs. 5 and 9
Summary
To improve the strength of a material, a layered structure is sometimes formed. A problem with layered materials is that unbonded defects occur. If stress is concentrated in unbonded areas, the strength of the material will decrease and the material may break.[1,2,3,4,5] The ultrasonic pulse method has been widely used as a nondestructive inspection method for materials and structures.[6,7] In this method, the probed surface has a finite size, and it is often probed by an ultrasonic probe having a size much larger than the wavelength of an ultrasonic wave and the size of a defect. The reflected signal from a small defect is averaged on the probed surface. In previous works,(8–11) the evaluation of phase characteristics
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