Abstract
The results of an experimental investigation using the metal magnetic memory (MMM) method are presented. A fatigue crack in an industrial press was cyclically loaded, and the stress concentration zone (SCZ) was measured at the crack location as a function of the number of cycles. Data taken during the cyclic loading process is presented showing the variation of MMM parameters as a function of crack propagation. This data leads to the conclusion that the self-magnetic leakage field (SMLF) intensity and the field gradient vary in the course of accumulation of fatigue damage in the microstructure under cyclic loading. There is an abrupt variation of the SMLF intensity and the field gradient at the same time as crack propagation was detected. The results showed that MMM is a powerful method that shows a correlation between the SCZ measured on industrial critical equipment and fatigue crack propagation.
V-1674-15.
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References
Dubov A, Kolokolnikov S (2013) The metal magnetic memory method application for online monitoring of damage development in steel pipes and welded joints specimens. Doc. IIW-2168. Weld World 57(1):123–136
ISO 24497-1:2007 Non-destructive testing—metal magnetic memory—Part 1: vocabulary
ISO 24497-1:2007 Non-destructive testing—metal magnetic memory—Part 2: general requirements
Russian standard GOST R 52330-2005 Non-destructive testing. Evaluation of the stressed-strained state of industrial and vehicle structures. General requirements
Russian standard GOST R 53006-2008 Technical diagnostics. Estimation of potential hazardous objects lifetime on the basis of express methods
The technique for assessment of turbine cylinders, lock and control valves condition using the MMM method. Developed by Energodiagnostika Co. Ltd.
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Dubov, A., Dubov, A., Kolokolnikov, S. (2018). MMM Applied for Online Monitoring of Fatigue Crack Propagation in an Industrial Steel Structure. In: Chapuis, B., Sjerve, E. (eds) Sensors, Algorithms and Applications for Structural Health Monitoring. IIW Collection. Springer, Cham. https://doi.org/10.1007/978-3-319-69233-3_7
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DOI: https://doi.org/10.1007/978-3-319-69233-3_7
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