Research Article
Characteristic Evaluation on Bolt Stress by Ultrasonic Nondestructive Methods
Table 4
Matlab least squares fit of the stress measurement coefficients,
and
.
| Material | Coefficient | 0–100 MPa | 100–360 MPa or 100–260 MPa | | | | |
| A2-70 | 3.7835 × 1016 | 1.1885 × 1017 | 2.813 × 1015 | 8.7741 × 1015 | 4.8 | 5.5036 × 1016 | 1.7992 × 1017 | 4.2938 × 1015 | 1.396 × 1016 | 8.8 | 3.3484 × 1016 | 1.0982 × 1017 | 3.543 × 1015 | 1.1544 × 1016 |
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