How is Composite Failure Index calculated?

Hello Fabian,

You can check here for further information about the equations behind the different failure criteria that we support.

If you need any further assistance please let me know.

Thanks!

Thank you for your answer,

I am aware of all the failure criterions, but it seems like "Composite Failure Index" is more of a generic prediction or combination of many criterions. Because "Composite Failure (respective criterion)" is the failure according to the criterion you activated.

But where does this index come from? Since it proved to be very accurate for my usecases.

Thank you very much!

Hello  Fabian,

Composite Failure Index: Failure Index, plots the maximum value of the all the "Composite Failure (respective criterion)" of the different criteria and modes that you have available in you analysis.

For example in your case in every element it will check the different failure of the criteria Hashin, Hill and Tsai across all the plies and will plot the highest one.  As you can understand when you have only one failure criteria in your analysis then you can get the same result by plotting "Composite Failure (respective criterion)" and by selecting Layer: "max".

I hope that this was helpful!