Be careful here. Bio fibres don't necessarily behave the same as classical materials which may invalidate many failure theories. Carbon fibres are typically brittle but a bio fibre can behave almost like an elastomer with a very non-linear stress-strain curve. Another comment is that I was talking to one of the standard failure theory authors some time ago and they said the worst mistake they used was to work with failure index. Margin of safety or strength ratio is easier to interprete so this is really what an engineer wants.

https://www.sciencedirect.com/search?qs=Failure%20of%20biocomposites&show=25&sortBy=relevance

Thank you sir for your kind help Md. Washim Akram

I will surely read these files.