Which three major specimen parameters influence eddy current testing?

Eddy current testing relies heavily on specific material properties to effectively evaluate and detect defects in conductive materials. The correct choice highlights three critical parameters: electrical conductivity, permeability, and material geometry.

Electrical conductivity is crucial because it determines how easily an electric current can flow through the material. In eddy current testing, the ability of the material to conduct electricity influences the depth of the eddy currents generated and how these currents interact with any flaws present.

Permeability relates to a material’s ability to support the formation of magnetic fields within it. Since eddy current testing involves the generation of magnetic fields, the permeability of the material affects the eddy current's behavior and its distribution within the specimen. Higher permeability can lead to different responses in the eddy current signal, providing valuable insights into the material's integrity.

Material geometry refers to the shape and size of the specimen being tested. The geometry can significantly influence how eddy currents are distributed within the material and how they interact with potential discontinuities. Variations in geometry can lead to changes in impedance, which is crucial for accurate analysis during testing.

Together, these parameters play a fundamental role in eddy current testing, affecting how signals are generated and interpreted during inspections.