## How to generate bending stiffness from equation of a curve?

## How to generate bending stiffness from equation of a curve?

(OP)

Dear friends,

I am modeling a composite beam with layered airfoil like shells wrapped over one another and need to find the cross sectional properties. I know the equations of the airfoil curves but could not implement the theory to calculate the bending stiffness. I studies a lot but did not find how to relate the equations of the airfoil to the curvature equations that is used to generate the Euler-Bernoulli beam theory. Can anybody help me to give an idea how to implement the equation of the airfoil layers to find cross sectional properties?. All the composite books, I have seen only thin plate like structures.

Thanks

Pratik

I am modeling a composite beam with layered airfoil like shells wrapped over one another and need to find the cross sectional properties. I know the equations of the airfoil curves but could not implement the theory to calculate the bending stiffness. I studies a lot but did not find how to relate the equations of the airfoil to the curvature equations that is used to generate the Euler-Bernoulli beam theory. Can anybody help me to give an idea how to implement the equation of the airfoil layers to find cross sectional properties?. All the composite books, I have seen only thin plate like structures.

Thanks

Pratik

## RE: How to generate bending stiffness from equation of a curve?

If the airfoils are non symmetric then you'll also need to find the neutral axis, and modify I by using the parallel axis theorem. This is something you should have covered in the first two years of your engineering degree, check your lecture notes.

Cheers

Greg Locock

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## RE: How to generate bending stiffness from equation of a curve?

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