Minimum Flaw sizes detectable in Rail Testing

Minimum Flaw sizes detectable in Rail Testing :-
Velocity = Frequency x Wavelength(λ)
Wave length (λ) = V / f
Frequency(f) Wave Velocity(V)
mm/s
Wave length(λ)
in mm
Minimum Flaw size(λ/2)
in mm
0◦ 4 Mhz Longitudinal wave 5.92 x 106 1.48 0.74
70◦ 2 Mhz Shear wave 3.23 x 106 1.615 0.8075
45◦ 2 Mhz (SEJ) Shear wave 3.23 x 106 1.615 0.8075
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