Abstract
The dynamic variation of amplitude and gratitude of metal magnetic memory (MMM) signals for a crack on a crane crossbeam was investigated during loading from 0 to 80KN. The result shows that the amplitude and gratitude of MMMT signals slowly increase from 0 to 50KN, quickly increase from 50 to 70KN and rapidly decrease from 70 to 80KN. The crack emerged result in the peak to peak value rapidly increasing and the shape of MMM signals change to sharp. The stress released results in decreasing of the peak to peak of the amplitude and gratitude of MMM signals. MMM testing method can be used to monitor the activity of surface crack or damage in steel structure.
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