Finite element simulation of non-destructive damage detection with higher harmonics


          

刊名：NDT & E International
作者：M. Kogl
S. Hurlebaus
L. Gaul
刊号：713C0009
ISSN：0963-8695
出版年：2004
年卷期：2004, vol.37, no.3
页码：195-205
总页数：11
分类号：TB4; TG115
关键词：Non-destructive testing；Damage selective imaging；Higher harmonics；Non-linear analysis；Fracture mechanics
参考中译：
语种：eng
文摘：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.



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