Instrumentation & Measurement Magazine 24-4 - 54

Table 2 - Smartphone-based detected magnetic
field intensities for various damage states
Damage State
Intact
Damage State 1
Damage State 2
Damage State 3
Damage State 4
Damage State 5
Damage State 6
Damage State 7
Damage State 8
Damage State 9
Cracks (mm)
None
1 crack (14×3)
2 cracks (14×3)
3 cracks (14×3)
1 crack (34×3)
2 cracks (34×3)
3 cracks (34×3)
1 crack (54×3)
2 cracks (54×3)
3 cracks (54×3)
Distance
(mm)
200
350
500
200
350
500
200
350
500
200
350
500
200
350
500
200
350
500
200
350
500
200
350
500
200
350
500
200
350
500
Magnetic
Field (μT)
286
88
42
287
89.5
43.5
288
91
45
289
92.5
47
288
91.5
46
291
93
48
292
95
50
291.5
92
47.5
293
95
51
296
98
55
Damage State 2
Damage State 3
Damage State 4
Damage State 5
Table 3 - Steel plate magnetic properties used in
the numerical simulations
Name
Type
Simple
Value
Relative Permeability Nonlinear B-H Curve
Bulk Conductivity
Magnetic Coercivity Vector
Magnitude
X component
Y component
Z component
Composition
54
Vector Mag
Unit Vector
Unit Vector
Unit Vector
-
1
Solid
Units
-
2000000 Siemens/m
-
-
A/m
-
-
-
-
IEEE Instrumentation & Measurement Magazine
Damage State 9
3 cracks (54×3)
200
350
500
285.1
86.5
41.7
June 2021
Damage State 8
2 cracks (54×3)
200
350
500
285.3
86.6
41.7
Damage State 7
1 crack (54×3)
Damage State 6
2 cracks (14×3)
3 cracks (14×3)
1 crack (34×3)
2 cracks (34×3)
3 cracks (34×3)
200
350
500
200
350
500
200
350
500
200
350
500
200
350
500
200
350
500
283.9
86.1
41.5
283.7
86
41.4
285.3
86.5
41.7
283.6
86
41.4
283.7
86.1
41.5
286.9
86.1
41.
Table 5 - Detected magnetic field intensities for
various damage states in the numerical study
Damage State
Intact
Damage State 1
Cracks (mm)
Uncracked
1 crack (14×3)
Distance
(mm)
200
350
500
200
350
500
Magnetic
Field (μT)
284.1
86.1
41.5
283.8
86. 1
41.5
Table 4 - Neodynium magnet magnetic properties
used in the numerical simulations
Name
Type
Relative Permeability Simple
Bulk Conductivity
Simple
Magnetic Coercivity Vector
Magnitude
X component
Y component
Z component
Composition
Value
1.0997785406
625000
-
Vector Mag -1060000
Unit Vector
Unit Vector
Unit Vector
-
-1
Solid
Units
-
Siemens/m
-
A/m
-
-
-
-

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