Table 2.

Residual stress value (MPa) of each specimen from indentation technique and the superposition of the stress intensity factor method

Specimen #	Residual stresses calculated from indentation technique(MPa)		Residual stress calculated from fractography (MPa)
	Group A (1 min)	Group B (24 h)	Group C
1	−6.65	−5.84	−7.27
2	−11.53	−15.12	−13.16
3	−15.25	−22.69	−23.35
4	N/A*	−29.84	−16.88
5	N/A	−24.92	−25.55
6	N/A	−17.92	−13.31
7	−12.32	−20.61	−2.08
8	−23.30	−22.27	−13.51
9	−12.72	−23.13	−23.46
10	−18.52	−20.21	−14.24
11	−23.30	−27.29	−28.33
12	N/A	−31.46	−31.70
13	−13.54	−20.61	−19.38
14	−14.38	−21.85	−24.00
15	−13.96	−15.79	−16.54
16	−13.96	−20.21	−19.34
17	−6.97	−10.29	−12.36
18	−7.95	−12.29	−11.73

^*no crack observed