### 6.3.1. Failure Properties

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.

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