| Fcl | closure load |
| Fep,L | ela stic–plastic transition load |
| Fmax | maximum load |
| Fmin | minimum load |
| Fop | opening load |
| FU | force applied during unloading |
| Se,L | loading slope (elastic contribution) |
| Se,U | unloading slope (elastic contribution) |
| ∆δe,L, ∆δp,L | range of CTOD elastic and plastic contributions during loading |
| ∆δe,U, ∆δp,U | range of CTOD elastic and plastic contributions during unloading |
| Uop | crack-opening level |
| Ucl | crack-closure level |
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