Magnetic
Particle
Magnetic Particle Testing Formula
Commonly used MT Formula are provided for reference
| Featured | Formula | Remarks |
|---|---|---|
| Current Formula Head Shot (Square Bar) |
Current
=
Bar diagonal * MF
Bar Diagonal
=
√a2 + b2
|
Where, Current = Amperage MF = Material Factor |
| Current Formula Head Shot (Irregular Shape) |
Current
=
p
π
* MF
|
Where, P = Perimeter MF = Material Factor |
| Current Formula Central Conductor Shot |
Current
=
[CCD + (2 * WT)] * MF
|
Where, CCD = Central Conductor Diameter WT = Wall Thickness MF = Material Factor |
| Current Formula -Low Fill Factor (Longitudinal Magnetism) |
NI
=
K
L
D
(Parts positioned to side of coil) |
Where, N = Number of turns in the coil K = Factor (45000 amps turn) L = Length of part D = Diameter of Part I = Current (amps) |
| Current Formula -Low Fill Factor (Longitudinal Magnetism) |
NI
=
KR
(
6L
D
)
- 5
(Parts positioned to center of coil) |
Where, N = Number of turns in the coil K = Factor (43000 amps turn) R = Radius of coil L = Length of part D = Diameter of Part I = Current (amps) |
| Current Formula - High Fill Factor (Longitudinal Magnetism) |
NI
=
K
(
L
D
)
+ 5
(includes cable wrap) |
Where, N = Number of turns in the coil K = Factor (35000 amps turn) L = Length of part D = Diameter of Part I = Current (amps) |
| Current Formula -Intermediate Fill Factor (Longitudinal Magnetism) |
NI
=
(NI)h
(10-t)
+
(NI)l
(t - 2)
8
|
Where, (NI)h = NI value calculated for high fill factor (NI)l = NI value calculated for low fill factor t = ratio of the cross sectional area of the coil to the cross sectional area of the part. N = Number of turns in the coil |
| Effective Diameter |
Deff
=
2[(At - Ah)/2]1/2
(When the part is hollow areas) |
Where, At = total cross sectional area of the part Ah = cross sectional area of the hollow part |
| Effective Diameter |
Deff
=
2[(OD)2 - (ID)2]1/2
(When the part is hollow areas) |
Where, OD = outer diameter of the cylinder ID = inner diameter of the cylinder |
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