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Nondestructive testing of surface breaking defects and near surface defects

: Arnold, W.; Becker, R.; Dobmann, G.; Salzburger, H.J.; Waschkies, E.

CIRP Annals. Manufacturing Technology 34 (1985), Nr.1, S.495-497
ISSN: 0007-8506
Fraunhofer IZFP ()

The material state (structure, stress, defect-free or not) of a component is of crucial influence on its service behaviour and lifetime. Accordingly, NDT-methods for defect detection and interpretation are developed and improved continuously. This contribution reviews the state of the art and recent developments. Beside electromagnetic methods like eddy current testing, magnetic leakage flux testing, ultrasonic testing with surface-sensitive wave-types, and acoustic emission techniques are mentioned. Finally, photoacoustic microscopy is discussed.