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GonPer

Composite Interlaminar shear stress

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Hi everyone,

 

I have a question about how the interlaminar stresses are calculated in shell element. I cant find it in the software documentation I have.

The thin shell element model does not calculate the interlaminar stresses or shear stresses right?

So there is a need to calculate it in another way, does it uses the equilibrium:

 

xTension/dx + xyShear/dy + xzInterLamShear/dz = 0?

 

What about in the free edge, does it assume zero there?

 

What's the failure criteria used? Is it a quadratic considering both xz and yz InterLamShear or just linear?

 

Sorry for so many questions but I need to justify this in my master thesis.

 

Thank you very much,

Best regards

Gonçalo

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Hi GonPer,

 

The composite interlaminar stresses are calculated based on the first-order shear deformation laminated plate theory.

 

You can refer to any Mechanics of Composite book for more information on the same.

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Hi Prakash,

 

Thank you very much for your answer.

I can justify it that way.

 

What about de failure criteria? Is it linear or quadratic?

 

Best regards,

Gonçalo

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Hi everyone,

 

For those who might need to know this, I've calculated it by hand and it looks like this:

 

BondCrit = ((tau_xz/ILSS)^2+(tau_yz/ILSS)^2)^0,5

 

Best regards,

Gonçalo

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