Research Article
Research on Fatigue Damage in High-Strength Steel (FV520B) Using Nonlinear Ultrasonic Testing
Table 4
Statistics of the cracks in the notched specimens (660 MPa stress concentration).
| | Samples number | Sample no. 4 | Sample no. 5 | Sample no. 6 |
| | Main crack length (mm) | 0.64 | 1.01 | 3.04 | | Number of microcracks | 20 | 24 | 32 | | Length of largest microcrack (μm) | 9.541 | 10.622 | 16.63 | | Equivalent microcrack length (μm) | 105.412 | 107.967 | 262.814 |
|
|
