Nondestructive indication of fatigue damage and residual lifetime in ferromagnetic construction materials

Tomas, Ivan and Kovarik, Ondrej and Vértesy, Gábor and Kadlecova, Jana (2014) Nondestructive indication of fatigue damage and residual lifetime in ferromagnetic construction materials. MEASUREMENT SCIENCE AND TECHNOLOGY, 25 (6). 065601. ISSN 0957-0233

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Abstract

A new revolutionary attitude towards investiga tion of fatigue damage in cyclically loaded steel samples is reported. The measurement is based on the method of Magnetic adaptive testing, which – in contrast to traditional magnetic hysteresis investigations – picks up the relevant information from systematic measur ement and evaluation of whole minor magnetic hysteresis loops and their derivatives. Sati sfactory correlations between nondestructively measured magnetic descriptors and actual life time of the fatigued material were found. The presented method is able to serv e as a powerful tool for indicati on of changes, which occur in structure of the inspected objects during their in dustrial service lifetime, as long as they are manufactured from ferromagnetic material

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