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Determination of Sheet Steel Formability Using Wide Band Electromagnetic-Acoustic Transducers

1992; Taylor & Francis; Volume: 4; Issue: 3 Linguagem: Inglês

10.1080/09349849209409530

1432-2110

A. V. Clark, C. M. Fortunko, M. G. Lozev, S. R. Schaps, M. C. Renken,

Non-Destructive Testing Techniques

Abstract An electromagnetic-acoustic transducer (EMAT) system was used in conjunction with a “sampled” CW signal-processing method to generate, receive, and process longitudinal and shear waves in thin steel sheets. Using the system, swept-frequency measurements were made up to 7.5 MHz. To relate the measurements to sheet steel formability, a dimensionless frequency ratio, K, was computed from the resonant frequencies. From theoretical considerations, K should be related to a measure of steel sheet formability, r . This parameter is traditionally measured by plastically deforming uniaxial tension specimens. Good correlation was found between K and r for a set of steel sheet representative of those typically used to produce automobile body parts.