Finite element simulation of non-destructive damage detection with higher harmonics
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When damaged bodies are subjected to dynamic loadings, a non-linear structural response is observed in the vicinity of the cracks. This non-linearity is caused by the contact between opposite crack surfaces. In case of a harmonic excitation, higher harmonics can be observed in the frequency spectrum. In non-destructive testing, this phenomenon can be employed to localise damaged areas. In the present paper, a methodology is described for the numerical simulation of non-destructive damage detection in the excitation frequency and the higher harmonics. The approach is based upon a transient finite element calculation, followed by an analysis of the structural response with the Fast Fourier transform. The suitable choice of analysis parameters is discussed, and examples are given for the detection of cracks in flat slabs. © 2003 Elsevier Ltd. All rights reserved.
author list (cited authors)
Kögl, M., Hurlebaus, S., & Gaul, L.