Issue 39

S. Harzallah et alii, Frattura ed Integrità Strutturale, 39 (2017) 282-290; DOI: 10.3221/IGF-ESIS.39.26 289 Figs. 13-16 represent the evaluation of resistance and reactance of the sensor versus the crack depth and width. We notice that when the width decreases, the value of resistance and the reactance decrease in a proportional way. Figure 11 : Impedance Z vs. crack width. Figure 12 : Impedance Z vs. crack depth . C ONCLUSION t is shown through this research work that obtained results are identified by a variation of impedance of the magnetic currents values. These values agreed with the previous results that lead us to determine the mechanical properties of fracture of materials. The new approach has been useful in the study of expansion and crack propagation in materials. It can easily predict afuture damage of mechanical parts. Besides, this technique can be benefit in the treatment of materials rather than changing parts. It gives accurate results and high performance for parts of materials. Herein, a possible prediction of cracks propagation through the determination of parameters SIF and J-integral using eddy currentby detecting crack tip opening displacement is described. Similar results are obtained for both parameters Kand J- integral using variation of the impedance. Notice that this method is widely used in industrial application because of its precision (minimal error) and its low costs. Figure 13 : Evaluation of resistance and reactance sensor vs. crack depth. Figure 14 : Evaluation of resistance and reactance sensor vs. crack width. 0.04 0.045 0.05 0.055 0.06 0.065 0 20 40 60 80 100 120 width=1.4mm width=1.2mm width=1 mm 0.04 0.045 0.05 0.055 0.06 0.065 0 20 40 60 80 100 120 depth=3mm depth=2mm depth=1mm -100 -80 -60 -40 -20 0 20 40 60 80 100 -250 -200 -150 -100 -50 0 50 100 150 200 250 reactance(V/I) RESISTANCE (V/I) w=1mm w=2mm w=3mm w=4.5mm -100 -50 0 50 100 150 -250 -200 -150 -100 -50 0 50 100 150 200 250 RISISTANCE Z REACTANCE X L=1mm L=2mm L=3mm I