Abstract
A classification method of the flaw type is discussed by utilizing the ultrasonic scattering amplitudes from flaws in an elastic body. The method is based on the combination of two linearized inverse scattering methods of Born and Kirchhoff inversions. The Born inversion is sensitive to the volumetric flaw but not to a crack-like flaw. The Kirchhoff inversion reacts to both surfaces of volumetric and crack-like flaws. The combined use of the Born and Kirchhoff inversions leads to the classification of flaw type. To show the versatility of the method, aluminum specimens that contain a circular cavity and artificial cracks are prepared, and the backscattered waveforms are acquired from the experimental measurement. The measured waveforms are processed and the waveforms are fed into the Born and Kirchhoff inversions. The results show that the crack-like flaw can be discriminated from the volumetric flaw. It is also shown that the scattered wave component in the low frequency range is important for the present classification method.
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Schedule a callMore From: Proceedings of the Asian Pacific Conference on Fracture and Strength and International Conference on Advanced Technology in Experimental Mechanics
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