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

Table 5

Inspection results for triple-type crack.

Actual depth	Actual crack gap	Estimated depth	Estimated crack gap (V)	Estimated crack gap (H)
7 mm crack (mm)
2.0	1.0	2.21 (10.5%)	1.12 (12%)	1.17 (17%)
	2.0	2.23 (11.5%)	2 (0%)	2.08 (4%)
	3.0	2.22 (11%)	2.8 (6.67%)	3.08 (2.6%)
10 mm crack (mm)
4.0	1.0	4.16 (8%)	1.0 (0%)	0.9 (10%)
	2.0	3.86 (7%)	1.8 (10%)	1.8 (10%)
	3.0	3.8 (10%)	3.2 (6.67%)	2.98 (0.67%)