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Values of critical J-integral (JQ or J0.5 mm) obtained from the different data sets (NM = not measurable; values in parentheses correspond to J0.5 mm)
| Steel | Specimen type | Side-grooved? | Loading rate | EDM slit | JQ (kN/m) | |
|---|---|---|---|---|---|---|
|
| ||||||
| Fatigue precrack | Saw-cut | |||||
| T200 | CVN | Yes | Impact | 593.5 | 540.4 | 816.2 |
| Quasi-static | 473.4 | 573.2 | — | |||
| No | Impact | — | 1032.8 | 1213.8 | ||
| KLST | No | 704.7 | 625.3 | — | ||
| X65 | CVN | Yes | Impact | 1163.9 | 1144.3 | — |
| Quasi-static | NM (496.4) | NM (604.1) | — | |||
| KLST | No | Impact | NM (711.9) | NM (691.4) | — | |
