| E 11 | Longitudinal elastic modulus |
| E 22 | Transverse elastic modulus |
| ν 12 | In-plane Poisson’s ratio |
| G 12 | In-plane shear modulus |
| l | Crack length |
| d | Crack depth |
| α | Angle between crack and loading direction |
| F 0 | Compression test preload |
| Δt | Sampling interval |
| Δε | Strain increment |
| ε 0 | Initial strain corresponding to preload |
| k | Slope of load displacement curve |
| A | Extensional stiffness matrix |
| N | In-plane load vector |
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