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Laminate Composites > Laminates theory > Laminates failure analysis

Maximum transverse shear stress

Failure Index

The failure index is calculated as:

{F}{13} = \frac{{τ}{13}}{{S}_{13}}

{F}{23} = \frac{{τ}{23}}{{S}_{23}}

Strength Ratio

The strength ration,SR, is

SR = \frac{1}{F}

Margin of Safety

The margin of safety calculated as a percentage,MS, is:

MS = (\frac{SR}{FS}-1)*100

Where FS is the safety factor.

Look up more details

Laminate failure analysis nomenclature

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Hill failure analysis (3D)

Hoffman failure analysis (2D)

Hoffman failure analysis (3D)

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Maximum stress failure analysis (2D)

Maximum stress failure analysis (3D)

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

Core ply material failure analysis

Interlaminar failure analysis (2D and 3D)

Laminate failure analysis references

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Maximum transverse shear stress, Simcenter 3D 2021.1 Series

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Source: https://docs.sw.siemens.com/en-US/doc/289054037/PL20200601120302950.advanced/xid1655142 · retrieved 2026-07-17