### Author Topic: Calculation of the bending stiffness for effective laminates  (Read 2342 times)

#### scotch86

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##### Calculation of the bending stiffness for effective laminates
« on: December 19, 2014, 04:53:58 AM »
Hi,

can anybody explain how HS is calculating the bending stiffness D for effective laminates?

I thought the bending stiffness is calculated by an simply approach based on the A-Matrix. For example A11 * t^3/12.

#### James

• Posts: 250
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##### Re: Calculation of the bending stiffness for effective laminates
« Reply #1 on: December 19, 2014, 10:27:45 AM »
The Dij of the effective laminates are calculated as Dij = Et^3/(12(1-v^2)).

-James

#### scotch86

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##### Re: Calculation of the bending stiffness for effective laminates
« Reply #2 on: December 19, 2014, 11:46:53 AM »
Thank you James for the answer.

If I compare the bending stiffness Dij of the effective laminate with the discrete reference laminate  the difference is huge.

E.g. D11= 56365 (reference laminate)

I know there is a difference between discrete and effective laminates. The difference is about 50%, I think this difference is too much.

This approache leads to much higher values. For my point of view this is not correct. There is any literature (paper) about that? I have not found any information.

Could you please give me further support?

Thanks!