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Time-of-flight diffraction (TOFD) technique for accurate sizing of surface-breaking cracks

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This paper deals with an experimental study for evaluation of TOFD technique for determination of size of the surface-breaking cracks. It extends the results presented in a previous paper(1). The study was confined to simulated cracks (machined slits). Difficulty was experienced using TOFD to size simulated cracks extending less than about 2 mm depth. This is due to the presence of the lateral wave, which obscures the tip-diffracted signals from the simulated cracks close to the surface and also due to the inherent lack of time resolution near the surface. Experimental errors are presented.
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Document Type: Research Article

Affiliations: 1: Department of Physics, Regional Engineering College, Tiruchirappalli - 15, India 2: NDTL, Bharat Heavy Electricals Limited, Tiruchirappalli, Tamil Nadu, India 3: Indira Gandhi Centre for Atomic Research, Kalpakam, Tamil Nadu, India

Publication date: June 1, 2003

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