Effect of crack induced nonlinearity on dynamics of structures: application to structural health monitoring

International Symposium on Dynamic Deformation and Fracture of Advanced Materials 2013

物理学;材料科学

Broda, D.^1 ; Hiwarkar, V.^2 ; Silberschmidt, V.V.^3 ; Staszewski, W.J.^1

Department of Robotics and Mechatronics, AGH University of Science and Technology, Al. Mickiewicza, 30-059 Krakow, Poland^1

Mechanical, Materials and Manufacturing Engineering, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom^2

Wolfson School of Mechanical and Manufacturing Engineering, Loughborough University, Leicestershire LE11 3TU Loughborough, United Kingdom^3

关键词: Bilinear behavior;    Breathing crack;    Dynamic loadings;    Finite element simulations;    Higher harmonics;    Localized effects;    Open cracks;    Vibration-based structural health monitoring;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/451/1/012015/pdf
DOI  :  10.1088/1742-6596/451/1/012015

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In recent years, there has been a growing interest in vibration-based structural health-monitoring techniques. At present, most of the vibration-based techniques consider an open crack, which is far from realistic situations. In real-life scenarios crack can open and close under the dynamic loading. This bilinear behavior of crack has a significant effect on dynamics of structures which was investigated by performing finite-element simulations of a beam with a breathing crack excited longitudinally. Its response measured at different locations with regard to the crack indicated that the crack-induced nonlinearity had a localized effect on dynamics of the beam. Measurements obtained near the crack revealed complex spectra with higher harmonics.