Damage Identification of Beam with Breathing Crack under Fractal Dimension

2017 International Symposium on Application of Materials Science and Energy Materials

材料科学;能源学

Zhao, Ying^1 ; Ren, Yi Chun^1

School of Changsha University of Science and Technology, Changsha, China^1

关键词: Ambient excitation;    Beam structures;    Box dimension;    Breathing crack;    Damage Identification;    Displacement response;    Time-frequency domain analysis;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/322/4/042027/pdf
DOI  :  10.1088/1757-899X/322/4/042027

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Damage identification has been more urgent in engineering, especially beam structure which is often damaged by ambient excitation. It is based on time-frequency domain analysis of beam with breathing crack under fractal dimension in this paper. An equivalent cantilever beam model is constructed. The stiffness cosine model with time as parameter is used to simulate the opening and closing process of crack. The most widely used box dimension in fractal dimension is selected to calculate and analyze the displacement response of beam structure. The results show that the changes of box dimensional of beam structure displacement response can determine whether there is damage or not and identify the damage degree intuitively. It is more practical for damage identification in actual engineering.