Damage Detection based on the Natural Frequency shifting of a clamped rectangular plate model

11th International Conference on Damage Assessment of Structures

物理学;材料科学

Hilmy, Irfan^1 ; Wahab, M M Abdel^2 ; Adesta, Erry Yullian T^1 ; Firdaus, Tasnim^1

International Islamic University Malaysia, Faculty of Engineering, Department of Manufacturing and Materials Engineering, P. O. Box 10, Kuala Lumpur

50728, Malaysia^1

Department of Mechanical Construction and Production, Ghent University, Belgium^2

关键词: Catastrophic failures;    Clamped rectangular plate;    Damage evolution;    Early failure detection;    Frequency-shifting;    Higher frequencies;    Nondestructive methods;    Rectangular plates;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/628/1/012034/pdf
DOI  :  10.1088/1742-6596/628/1/012034

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Damage detection of any structure becomes the main concern in a failure analysis. Early failure detection is very important as it can prevent any catastrophic failure by replacing or repairing the damage part at early stage. One of the non-destructive methods of damage detection is using frequency based vibration analysis. Identification and comparison of a set of natural frequencies before and after damage is the main concern of this research. A rectangular plate clamped at all edges represented an initial undamaged structure. Based on Kachanov's definition, damage existence in a structure is introduced in the presence of some circular voids. The voids are generated randomly at different level of damage value. To obtain the Natural Frequencies, a Finite Element Model (FEM) of a clamped plate with the updated value of Young's Modulus is analyzed. From the FEM analysis result, it is found that the Natural Frequencies are shifted as the void existence increase. Using curve fitting, the model of Natural Frequency shifting as a function of damage evolution has been generated. It is found that the shifting of the Natural Frequency is greater at higher frequency value as indicated by the higher absolute gradient.