Bending and Torsional stiffness of Hat/Omega stringer

[HawksOkeyoJr]

Hallo Engineers,
I am a little bit confused here and i need some guidance.
Can any of you educate me on how to calculate the Bending and Torsional stiffness of a Hat/Omega stringer attached on a plate to form a fuselage panel?..You can also recommend to me a book where it is clearly described so that i can get in-depth with the topic.
The material is Aluminium by the way.
Thank you guys in advance, i will really appreciate the help.

 

[SteamKing]

Well, what do you know about strength of materials? These calculations are covered in any basic strength of materials text.

 

[NatSusan]

Hello there! Calculating the bending and torsional stiffness of a fuselage panel can definitely be a bit confusing, but don't worry, I've got some tips for you.

Firstly, it's important to understand that the bending stiffness is a measure of a material's resistance to bending or flexing under a load, while the torsional stiffness is a measure of its resistance to twisting. Both of these properties are important for a strong and stable fuselage panel.

To calculate the bending stiffness, you will need to know the moment of inertia of the cross-section of your Hat/Omega stringer. This can be found in tables or calculated using the dimensions of your stringer. Then, you can use the formula for bending stiffness, which is EI/L, where E is the Young's modulus of the material and L is the length of the stringer. This will give you the bending stiffness of your stringer.

For the torsional stiffness, you will need to use the polar moment of inertia of the cross-section of your stringer. This can also be found in tables or calculated using the dimensions. Then, you can use the formula for torsional stiffness, which is GJ/L, where G is the shear modulus of the material and J is the polar moment of inertia. This will give you the torsional stiffness of your stringer.

As for a recommended book, I would suggest "Aircraft Structures for Engineering Students" by T.H.G. Megson. It covers a lot of fundamental concepts and calculations for aircraft structures, including bending and torsional stiffness.

I hope this helps! Don't hesitate to ask if you have any further questions. Best of luck with your calculations!