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Does anyone know if the failure shear strain for unidirectional AS4/3501-6 Carbon fiber-epoxy composite is engineering strain or tensor strain? The symbol is gamma which in some notations is used for engineering strain with an epsilon for tensor strain, but other notations keep the gamma for tensor shear strain. The difference is just that engineering strain is twice tensor strain but it makes a big difference in failure prediction. The handout I have of material properties does not say.
The book uses gamma for both so it is really hard to tell what they are using but the instructor uses gamma and epsilon to differentiate. In one problem I saw them mention gamma and it turned out to be a tensor strain. But that was not a problem from the book.
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened
Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
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