| List of Symbols | |
| K I c | Mode I fracture toughness |
| G I c | Critical energy release rate |
| R2 | Coefficient of determination |
| G | Energy release rate |
| KI | Stress intensity factor for mode I |
| NSCB | Notched semi-circular bending |
| CCCD | Center-cracked circular disk |
| Φ | Diameter of specimen |
| R | Radius of specimen |
| t | Thickness of specimen |
| Pmax | Peak loading |
| ν | Poisson’s ratio |
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