Structural Health Monitoring with Higher Harmonics
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.
Stefan Hurlebaus
Zachry Department of Civil Engineering,Texas A&M University,College Station,TX 77843-3136,USA
国际会议
The World Forum on Smart Materials and Smart Structures Technology(SMSST07)(2007年世界智能材料与智能结构技术论坛)
重庆·南京
英文
2007-05-01（万方平台首次上网日期，不代表论文的发表时间）