STRESS CHARACTERIZATION BY LOCAL MAGNETIC MEASUREMENTS

摘要

This research was aimed at determining whether local magnetic measurements are sensitive to residual stresses in pipeline steel caused by mechanical damage. It was found that measurements of magnetic parameters can be used to characterize stress and strain. Coercivity, coercivity anisotropy, remanence, hysteresis loss and hysteresis loop angle were all found to be sensitive to the effects of mechanical damage. Hysteresis loss was found to be the parameter most sensitive to mechanical damage. In contrast the hysteresis loop angle was found to be the least sensitive magnetic parameter.