A Study on Depth Sizing for Surface Cracks in KTX Brake Disc Using Rayleigh Wave

Table 6

Inspection results for C-2-1 and C-2-2 crack (mm).

Position	Actual length	Actual width	Estimated length (error factor)	Estimated width (error factor)	Estimated depth
C-2-1 crack (mm)
(1)	50	3.0	50.4 (0.8%)	3.0 (0%)	1.14
(2)					2.27
(3)					3.28
(4)					4.1
(5)					4.17
C-2-2 crack (mm)
(1)	40	4.0	40 (0%)	4.0 (0%)	0.15
(2)					0.89
(3)					1.27
(4)					2.18
(5)					4.34