The failure initiation stresses can be derived from experiment as described in Table 6.2: Failure Properties and the Tests Used to Measured Them.
Table 6.2: Failure Properties and the Tests Used to Measured Them
| Property | Experimental Test |
|---|---|
| σ11fail | Calibrated to experiment to give good agreement with spall plate tests and DCB. |
| σ22fail | 0° or 90° tension test depending on orientation of material directions. |
| σ33fail | 0° or 90° tension test depending on orientation of material directions. |
| σ31fail | Interlaminar shear strength test. |
| σ23fail | 45° tension test and calibration via simulation. |
| σ12fail | Interlaminar shear strength test. |