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Composite failure vs failure index

Hello,

 

I have some doubts about composite failure and composite index, relatively to the composite analysis postprocessing. As far as i think, composite failure is a number which should be compared to one according to the composite resistance theories (Tsai-Wu, Hoffman ecc).

 

But then what does 'failure index' mean? And what 'Plies with Maximum FI'? Which is the relationship between th failure index and the composite failure?

 

Thank you

 

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