Issue 39

S. Harzallah et alii, Frattura ed Integrità Strutturale, 39 (2017) 282-290; DOI: 10.3221/IGF-ESIS.39.26 282 Numerical study of eddy current by Finite Element Method for cracks detection in structures S. Harzallah, M. Chabaat, K. Chabane University Built Environmental Research Lab., Civil Engineering Faculty, University of Sciences and Technology HouariBoumediene, B.P 32 El Alia Bab Ezzouar, Algiers 16111 Algeria. sharzallah@usthb.dz , M.Chabaat@usthb.dz, Kahinachabane91@yahoo.fr A BSTRACT . In this paper, we try to use the finite element method of 2-D axisymmetry to solve problems in eddy current testing problems where the main idea is detecting crack's shape using the NDT-EC. Results are given for a simple eddy current problem using the finite element method as a tool to control cracks and defects in materials and eventually, to study their propagation as well as their shape classification. These latest can be described as the task of reconstructing the cracks and damage in a tube’s profile of an inspected specimen in order to estimate its material properties. This is accomplished by inverting eddy current probe impedance measurements which are recorded as a function of probe position. This approach has been used in the aircraft industry to control cracks. Besides, it makes it possible to highlight the defects of parts while preserving the integrity of the controlled products. K EYWORDS . Non destructive testing; Sensor eddy currents; Differential mode; Stress intensity factor. Citation: Harzallah, S., Chabaat, M., Chabane, K., Numerical study of eddy current by Finite element method for cracks detection in structures, Frattura ed Integrità Strutturale, 39 (2017) 282-290. Received: 13.10.2016 Accepted: 09.12.2016 Published: 01.01.2017 Copyright: © 2017 This is an open access article under the terms of the CC-BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. I NTRODUCTION here are often sharp breaks that cause bad consequences because of existing defects (cracks, micro-cracks, crazes etc…) inside or outside parts [1]. On the other hand, usual calculations of continuum mechanics cannot predict fracture because it requires the absence of any failure or the development of fracture mechanics, defined as the science studying a structure with defects [2]. It is characterized by irreversible separation of a continuous medium into two parts on either side of a geometrical surface called crack created by damage under the effect of a biasing or default prepared when setting. It also controls the evolution of the crack, [3]. In the aircraft industry as well as in the majority of industries of transport, the non-destructive tests (NDT) can make the difference between life and death. Non-destructive examination using inductive sensors is a relatively common method in the industry (aviation, automotive, nuclear power, etc…). Its development is primarily due to the advanced technology provided. The NDT aims to detect cracks while preserving the integrity of the product. This definition is rather broad and T