Effect of the number of surface flaws in a group on their magnetic field

Abstract

The effect of the number of surface flaws in a group on the value of their magnetic field in air above a ferromagnetic article is considered.

Sizing of multiple cracks using magnetic flux leakage measurements

“…Also, this model does not consider the mutual influence of neighboring cracks. This may affect the accuracy of the calculated magnetic field when the cracks are close to each other [5]. Although considering these effects may produce more accurate results in some special cases (e.g.…”

“…Although considering these effects may produce more accurate results in some special cases (e.g. [5], [7]), they increase the computational complexity and are not general. Here, since we use the analytical model as a fast and less accurate 'coarse' model, we can afford the simplicity of the model assuming constant distribution of the magnetic dipole density and neglecting the effect of mutual influence among the cracks.…”