Location

La Jolla ,CA

Start Date

1-1-1989 12:00 AM

Description

The scientific interpretation of the results obtained by eddy currents testing long cylindrical products is much easier when using long rather than short solenoids. The long product is then in an uniform state of magnetic induction. A simple model is developped to size long axial emerging rectangular defects of various widths and depths.

For non-ferromagnetic materials, at relatively high frequency, the inductance L varies linearly with the cross-section of the defect and the resistance R varies also linearly with the depth of the defect. The model allows to calculate the linear coefficients of influence. Experimental tests carried on copper and aluminium rods have fully validated the theoretical model.

For ferromagnetic materials, the model is modified in order to take the magnetization into account. Experimental tests are in progress and results will be presented elsewhere.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

8A

Chapter

Chapter 1: Fundamentals of Classic Techniques

Section

Eddy Currents

Pages

291-298

DOI

10.1007/978-1-4613-0817-1_37

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Eddy Currents Testing of Long Cylindrical Products with Long Solenoids

La Jolla ,CA

The scientific interpretation of the results obtained by eddy currents testing long cylindrical products is much easier when using long rather than short solenoids. The long product is then in an uniform state of magnetic induction. A simple model is developped to size long axial emerging rectangular defects of various widths and depths.

For non-ferromagnetic materials, at relatively high frequency, the inductance L varies linearly with the cross-section of the defect and the resistance R varies also linearly with the depth of the defect. The model allows to calculate the linear coefficients of influence. Experimental tests carried on copper and aluminium rods have fully validated the theoretical model.

For ferromagnetic materials, the model is modified in order to take the magnetization into account. Experimental tests are in progress and results will be presented elsewhere.