Am I conservative?
Am I conservative?
(OP)
Hello!
I have a composite panel of 12 plies. I'm studying its buckling and stiffness resistance.
The problem is that the FEM which I am using to read flows (to enter in my calculations) has 8 plies.
It is supposed that a panel with 12 plies takes more load that the 8 plies' one. So...Am I making a mistake?? Is there any way to use the available FEM without mistake?
Best regards!
I have a composite panel of 12 plies. I'm studying its buckling and stiffness resistance.
The problem is that the FEM which I am using to read flows (to enter in my calculations) has 8 plies.
It is supposed that a panel with 12 plies takes more load that the 8 plies' one. So...Am I making a mistake?? Is there any way to use the available FEM without mistake?
Best regards!





RE: Am I conservative?
A little more information would be helpful.
Garland E. Borowski, PE
Borowski Engineering & Analytical Services, Inc.
www.borowskiengineering.com
RE: Am I conservative?
good luck
RE: Am I conservative?
Garland E. Borowski, PE
Borowski Engineering & Analytical Services, Inc.
www.borowskiengineering.com
RE: Am I conservative?
Both panels only have in-plane loads.
To sum up, the only difference between the panels is the number of plies. Does the thickest take more load than the thinnest?
RE: Am I conservative?
RE: Am I conservative?
The strength, stiffness, buckling load of the 12 ply panel MAY be higher than the 8 ply panel, but it depends on the stacking sequences of the 2 panels. Thicker is not always better if the layups are significantly different. If the 12 ply panel has the same 8 center plies as the 8 ply panel, then it is very likely that the 12 ply panel will be stiffer and stronger.
RE: Am I conservative?
http://
If you understand what this is doing, I think you can get your answer. This provides failure envelopes for first ply failure. it includes graphs for various planes.
Garland E. Borowski, PE
Borowski Engineering & Analytical Services, Inc.
www.borowskiengineering.com
RE: Am I conservative?
RE: Am I conservative?
David R. Dearth, P.E.
Applied Analysis & Technology