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.
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Laminate failure analysis nomenclature
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Hoffman failure analysis (3D)
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Interlaminar failure analysis (2D and 3D)
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Source: https://docs.sw.siemens.com/en-US/doc/289054037/PL20200601120302950.advanced/xid1655142 · retrieved 2026-07-17