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Asset Integrity Management of Critical Infrastructure
Editor
Mamdouh M. Salama
Mamdouh M. Salama
MMS4Aim LLC, USA
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Dragan Komljenovic
Dragan Komljenovic
Hydro-Québec, Canada
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Jovica R. Riznic
Jovica R. Riznic
Canadian Nuclear Safety Commission, Canada
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ISBN:
9780791887738
No. of Pages:
180
Publisher:
ASME
Publication date:
2024

Metal Magnetic Memory Testing (MMMT) is a nondestructive testing technology, which has the advantages of no external magnetic excitation, no surface pretreatment, fast detection and early damage detection. To further investigate the influence of cracks on the distribution of metal magnetic memory signals, tensile tests were carried out on the specimens with cracks. Specimens were demagnetized to eliminate the influence of the initial magnetic field before the test. The metal magnetic memory signals including tangential component and normal component on the surface of the specimens were collected by the magnetic detector. The stress distribution on the surface of the specimens during loading was obtained by ABAQUS finite element simulation. Combined with the distribution of residual stress, the distribution of metal magnetic memory signals was analyzed from four aspects. Firstly, the evolution of metal magnetic memory signals of the specimens with cracks under different loads was analyzed. Secondly, the metal magnetic memory signals of the specimens with and without cracks under the same load were compared. Thirdly, the cloud images of metal magnetic memory signals of the specimens with and without cracks under the same load were compared. Finally, characteristic parameters of cracked and smooth specimens were compared. The analysis results show that the metal magnetic memory signals can sensitively reflect the change of residual stress caused by the existence of cracks. The distribution characteristics of the magnetic memory signal will change obviously due to the cracks.

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