Fuselage Shell - error

[RJMathiyazhagan]

Hi everyone,

I am currently developing a fuselage model. My goal is to create a monocoque structure with formers. For the FEA simulation, I require a 4 mm skin thickness for the carbon fiber and sandwich material.

However, I'm facing a challenge in making the 4 mm shell operation in Fusion 360. I have tried many different approaches, but none of them worked. I'm feeling frustrated and stuck.

I would appreciate any assistance or suggestions on how to solve this issue or any alternative methods to achieve the same result.

Thank you so much for your time and attention. You are awesome!

[wersy]

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@RJMathiyazhagan  schrieb:

I am also new to composite construction and modeling. This is my first project on full composites.

Before you continue, you need to know exactly how you want to build the plane. Whether in wood, carbon or 3D printing, you need to have a lot of experience with the respective method.

If it is to be built in CFS, you will need a negative mold. That alone is an art in itself.
Then you don't need a shell for FEM, because you can forget about FEM, it can't be simulated properly. And especially for FEM you need a lot of knowledge about statics.

[RJMathiyazhagan]

I appreciate your insights very much. They are very helpful.

I have already experimented with making negative molds using carbon and glassfibre skin with foam sandwiched bulkheads. However, the fuselage turned out to be too fragile and I could not make it fly. That is why I am interested in FEM simulations for the laminate arrangements.

I am not sure why I do not need a shell for FEM. Could you please explain that to me? Is there another way to evaluate the strength of the composite laminates?

Thank you for your valuable time and support.

[wersy]

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@RJMathiyazhagan  schrieb:

I am not sure why I do not need a shell for FEM. Could you please explain that to me? Is there another way to evaluate the strength of the composite laminates?

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I meant you don't need a shell for a negative form.
There is no material available as you want to use it to perform an FEM.
Also, to do a FEM you need a lot of experience in structural analysis. That alone is not enough, you also need to have a lot of experience with FEM. A small error in the load distribution is enough to get completely wrong results.

The safest method is still to build, test and improve.

[RJMathiyazhagan]

Thank you for getting me back.

Yeah! I got your point.

True .. Fusion cannot perform orthotropic materials simulation I guess.

I know learning FEA is not a small task. Because of my previous failure now I forced to learn FEA.

I am trying to learn new FEA software's please let me know any resources on that.

Thank you for your valuable time.