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Table 4
Sample properties, SCB testing parameters and experimental results for the estimation of the mode I fracture toughness in Obourg and Ciply chalks samples.
Propriétés des échantillons, paramètres des essais SCB et résultats expérimentaux pour l’estimation de la ténacité en mode I dans les craies d’Obourg et de Ciply.
| Sample name | Test type | Radius R (mm) | Spacing s (mm) | s/D | Thickness B or Length L (mm) | Notch length a (mm) | a/R | Stress Intensity Factor Y or Y’ | Peak Load Fmax (kN) | KIC (MPa m1/2) |
|---|---|---|---|---|---|---|---|---|---|---|
| Obourg chalk dry | ||||||||||
| OBSC1 | SCB | 24.5 | 24.5 | 0.50 | 26.2 | 10.0 | 0.41 | 2.95 | 0.20 | 0.0816 |
| OBSC2 | SCB | 25 | 25.0 | 0.50 | 25.9 | 10.0 | 0.40 | 2.91 | 0.20 | 0.0805 |
| OBSC3 | SCB | 25.2 | 25.2 | 0.50 | 25.6 | 12.5 | 0.50 | 3.64 | 0.16 | 0.0895 |
| OBSC4 | SCB | 24 | 24.0 | 0.50 | 24.0 | 10.0 | 0.42 | 3.01 | 0.20 | 0.0926 |
| OBSC5 | SCB | 24.5 | 24.5 | 0.50 | 24.0 | 9.5 | 0.39 | 2.84 | 0.21 | 0.0854 |
| OBSC6 | SCB | 24.5 | 24.5 | 0.50 | 23.0 | 10.8 | 0.44 | 3.16 | 0.14 | 0.0696 |
| OBSC7 | SCB | 24.5 | 24.5 | 0.50 | 24.5 | 9.3 | 0.38 | 2.78 | 0.20 | 0.0790 |
| OBSC8 | SCB | 24.5 | 24.5 | 0.50 | 22.0 | 8.5 | 0.35 | 2.64 | 0.16 | 0.0641 |
| OBSE1 | SECRBB | 12.5 | 83.3 | 3.33 | 100.0 | 7.5 | 0.60 | 7.96 | 0.06 | 0.1158 |
| OBSE2 | SECRBB | 12.5 | 83.3 | 3.33 | 100.0 | 7.5 | 0.60 | 7.96 | 0.07 | 0.1360 |
| OBSE3 | SECRBB | 12.5 | 83.3 | 3.33 | 100.0 | 8.0 | 0.64 | 8.39 | 0.05 | 0.1062 |
| OBSE4 | SECRBB | 12.5 | 83.3 | 3.33 | 100.0 | 7.5 | 0.60 | 7.96 | 0.06 | 0.1259 |
| OBSE5 | SECRBB | 20 | 133.2 | 3.33 | 160.0 | 15.0 | 0.75 | 9.77 | 0.08 | 0.1008 |
| Obourg chalk water-saturated | ||||||||||
| OBSC9 | SCB | 24.0 | 24.0 | 0.5 | 26.2 | 10.0 | 0.42 | 3.01 | 0.15 | 0.0647 |
| OBSC10 | SCB | 24.0 | 24.0 | 0.5 | 25.5 | 10.0 | 0.42 | 3.01 | 0.11 | 0.0479 |
| OBSC11 | SCB | 25.0 | 25.0 | 0.5 | 25.6 | 13.0 | 0.52 | 3.88 | 0.08 | 0.0490 |
| OBSC12 | SCB | 24.5 | 24.5 | 0.5 | 24.0 | 9.8 | 0.40 | 2.89 | 0.13 | 0.0538 |
| OBSC13 | SCB | 24.5 | 24.5 | 0.5 | 25.0 | 10.0 | 0.41 | 2.95 | 0.11 | 0.0449 |
| OBSC14 | SCB | 24.5 | 24.5 | 0.5 | 24.5 | 10.0 | 0.41 | 2.95 | 0.12 | 0.0523 |
| Ciply chalk dry | ||||||||||
| CPSC1 | SCB | 24.5 | 24.5 | 0.5 | 26.0 | 11.0 | 0.45 | 3.24 | 0.08 | 0.0378 |
| CPSC2 | SCB | 24.5 | 24.5 | 0.5 | 25.0 | 10.3 | 0.42 | 3.02 | 0.15 | 0.0641 |
| CPSC3 | SCB | 24.5 | 24.5 | 0.5 | 18.0 | 9.0 | 0.37 | 2.73 | 0.08 | 0.0417 |
| Ciply chalk water-saturated | ||||||||||
| CPSC4 | SCB | 24.5 | 24.5 | 0.5 | 25.0 | 9.5 | 0.39 | 2.84 | 0.08 | 0.0310 |
| CPSC5 | SCB | 24.5 | 24.5 | 0.5 | 24.0 | 10.5 | 0.43 | 3.09 | 0.05 | 0.0239 |
| CPSC6 | SCB | 24.5 | 24.5 | 0.5 | 18.5 | 9.3 | 0.38 | 2.78 | 0.06 | 0.0314 |
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