Finite element modeling of MOI for NDE applications

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2000-01-01
Authors
Chen, Chao
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Magneto-optic eddy current imaging (MOl) systems have shown considerable promise in detecting both surface and subsurface corrosion and cracking of aging aircraft. MOl systems can produce real-time analog images of inspected parts, image both surface breaking and subsurface cracks without removing paint or decal. The images are easy to interpret, which in turn reduces inspection time and labor. Improvements and innovations in probe design are constantly required for detecting smaller and smaller flaws in complex multi-layer aircraft structures. Crucial for such studies is the development of a numerical model for simulating the underlying physical process, which can help in making more informed design optimization decisions. This thesis presents the development of a FEM for predicting quantitative values of the fields detected using MO imaging systems. The model is used extensively to study the effect of parametric variations on the field values. The results demonstrate the usefulness of the finite element model not only in understanding the capabilities of the instrument, but also in identifying optimal test parameters, and development of image interpretation algorithms.

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CNDE
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