Vol.23, No.2, 2023, pp. 173–178
UDC:

EXPERIMENTAL AND NUMERICAL DETERMINATION OF DEFECTS IN RECTANGULAR PLATES WITH VIBRATION ANALYSIS METHOD

Samir Belamri1, Habib Lebbal2*, Tayeb Yahiaou3, Djillali Boutchicha1, Tawfik Tamine5

1) Laboratory of Applied Mechanics, GM Faculty, University of Science and Technology of Oran, ALGERIA

2) Research Laboratory of Technology and Fabrication Mechanics, University of Science and Technology of Oran, ALGERIA

*email: lebbalh@yahoo.com 

3) Laboratory of Aeronautics and Propulsion Systems, Dept. of Mech. Eng., University of Science and Technology of Oran, ALGERIA

4) LCGE Laboratory, Faculty of Mechanical Engineering, University of Science and Technology of Oran, ALGERIA

 

Abstract

We have specified our study on thin rectangular plates. We created cracks according to several planes, position, and depth (crack length); then we measured the responses of tested structures from excitations caused in the form of pulses generated by an impact hammer. Obviously, and to highlight the results found, one proceeds first by the finite element method as a theoretical (numerical) reference. The experimental results and their variety for each type of test (nature of the notch and position) show that there is an acceptable approximation. It is important to say that the detection of defects by cracking remains possible and easy in a relatively high-frequency range. However, at low frequencies, the detection requires data precision, for example, the ‘zoom’ mode can be used. Generally, vibration control makes it easy to detect cracks in a mechanical structure and is used above all for the advantages it brings in the context of preventive maintenance, because it is in real-time and offers precision without equivocal.

Keywords: vibration analysis, cracks and notches, finite element method (FEM)

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