Issue 39

S. Harzallah et alii, Frattura ed Integrità Strutturale, 39 (2017) 282-290; DOI: 10.3221/IGF-ESIS.39.26

3 x 10 -3

16 x 10 -3

0.07

0.07

14

0.065

0.065

2.5

12

0.06

0.06

2

10

0.055

0.055

1.5

8

6

0.05

0.05

1

4

0.045

0.045

0.5

2

0.025 0.03 0.035 0.04 0.045 0.05 0.055 0.06 0.065 0.07 0.04

Figure 6 : Representation of the magnetic induction. 0.025 0.03 0.035 0.04 0.045 0.05 0.055 0.06 0.065 0.07 0.04

0

Figure 7 : Density of induced currents.

.

Figure 8 : ∆Z for F =10, 100 and 240 Khz.

0.5

2

0.4

1.5

0.3

1

0.2

0.5

0.1

0

0

-0.5

-0.1

-1

-0.2

-1.5

-0.3

-2

-0.4

-2.5

-0.5

-0.025 -0.02 -0.015 -0.01 -0.005

0

0.005 0.01 0.015 0.02 0.025

-0.025 -0.02 -0.015 -0.01 -0.005

0

0.005 0.01 0.015 0.02 0.025

Figure 9 : The imaginary part impedance Z (Ω).

Figure 10 : The real part impedance Z (Ω).

Effects between dimensions of a defect and the sensors In this research, we consider two cases of shape’s geometries. Each one includes three different defects and for each system, we obtain results after the execution of the program. These values are represented in the form of curves of the impedance ΔZ. In Fig. 11 and 12, when the width decreases, the value of impedance ΔZ decreases. The width of the defect has a great influence on the variation of impedance. The variation depth of the defect has a light influence on ΔZ. It is noticed that the difference of impedance ΔZ has a relationship with the width of the defect. Whenever the width of defect increases, ΔZ automatically increases and vice versa. Consequently, the depth of defect has an influence on impedance. The variation depth of the defect has a light influence on ΔZ. It is noticed that the difference of impedance ΔZ correlates with the width of the defect. It is noticed that the difference of impedance ΔZ has a dependency on the width of the defect and the depth of a defect has a great influence on the impedance.

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