Abstract
Inductive thermography has been proved to be an excellent method for detecting surface cracks in metallic materials. The Joule heating is generated directly in the workpiece due to the induced eddy current and its penetration depth is determined by material properties and by the excitation frequency. Whether an additional temperature increase or a colder area around the crack occurs, is determined by the ratio of the crack depth to the penetration depth. It is investigated how material parameters, excitation frequency, crack depth and its inclination angle affect the temperature distribution around a crack after a short heating pulse. With finite element simulations material independent results are calculated showing in which frequency and temporal range crack detection is possible. These results are analyzed more closely for four selected metals: ferro-magnetic and non-magnetic steel, aluminum and titanium.
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