Abstract
Abstract In this work the lock-in-thermography was tested for crack detection capabilities. Instead of an external heat source the thermo elastic effect induced by the mechanical loading is used for cyclic thermal stimulation. This procedure was applicable for crack detection in an aluminium centre cracked tension specimen (CCT) during a running fatigue test. As lock-in input signal the force as well the signal of a strain gauge, placed in the surrounding of an estimated crack initiation site, can be used, respectively. This strain gauge can also be attached perpendicular to the loading direction.
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