Feasibility of Residual Stress Nondestructive Estimation Using the Nonlinear Property of Critical Refraction Longitudinal Wave

Table 1

Sensitivity parameters of the relative nonlinear coefficient and wave velocity for stress.

Prestress (MPa)	Sensitivity parameter 1 (%)	Standard deviation 1 (×10^−6)	Sensitivity parameter 2 (%)	Standard deviation 2
40	1.9299	5.99	0.0019	0.413
80	7.3764	6.61	0.0279	0.369
120	10.1532	4.979	0.0392	0.42
160	13.2785	7.084	0.0554	0.582
200	18.9297	9.46	0.0649	0.537
240	23.8714	6.54	0.1197	0.328
280	40.058	8.165	0.1349	0.43
320	56.1403	7.993	0.1664	0.516
360	71.7694	6.064	0.2021	0.484
400	87.2034	5.315	0.2075	0.576