Maximum stress failure analysis (2D)

Failure Index

The failure index F output by the software corresponds to the largest value of:

For variable definitions see Laminate failure analysis nomenclature.

Margin of Safety

Margins of safety, MS, are computed as follows:

Strength Ratio

The strength ratio, SR, is:

Note:

Nastran solver does not directly support the maximum stress failure theory for 2D elements. However, the solver can effectively perform the maximum stress failure calculations if the failure theory on the PCOMP or PCOMPG card is set to the maximum strain while the stress limits are defined on the MAT8 card. To set this up, select the maximum strain failure theory and define only the stress limits for the material. Nastran solver writes the stress limits to the MAT8 card and leaves the STRN field blank. If you define both stress and strain limits, the solver exports the stains ones and does not perform maximum stress failure calculations.

Look up more details

Laminate failure analysis nomenclature

Hill failure analysis (2D)

Hill failure analysis (3D)

Hoffman failure analysis (2D)

Hoffman failure analysis (3D)

Tsai-Wu failure analysis (2D)

Tsai-Wu failure analysis (3D)

Maximum stress failure analysis (3D)

Maximum strain failure analysis (2D)

Maximum strain failure analysis (3D)

LaRC02 failure analysis (2D)

Puck failure analysis (2D)

Von Mises yield and Von Mises ultimate failure analyses (2D and 3D)

Maximum transverse shear stress

Core ply material failure analysis

Interlaminar failure analysis (2D and 3D)

Laminate failure analysis references

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Maximum stress failure analysis (2D), Simcenter 3D 2021.1 Series

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