What is the effect of a discontinuity on eddy current flow?

The presence of a discontinuity, such as a crack or a void, significantly disrupts the flow of eddy currents in a conductive material. When eddy currents are induced in a material, they flow in closed loops and are dependent on the integrity and continuity of the material itself. A discontinuity alters the path that the eddy currents can take, causing them to scatter or become impeded.

This disruption can lead to localized changes in magnetic field strength and resistance. Essentially, the eddy currents will divert around or be obstructed by the discontinuity, resulting in fluctuations in the flow and intensity of the currents. Thus, the effect of discontinuities on eddy current flow is indeed one of disruption, making it harder for the eddy currents to circulate freely within the material. This principle is utilized in non-destructive testing to locate and evaluate discontinuities in conductive materials.