# orthotropic material properties of sinusoidal corrugated steel

Member

Hello everyone,

I want to modell a corrugated steel pipe in Ansys as a simple cylinder with orthotropic properties. I started modelling a simple plate and I found Ex, Ey and Gxy, exy, with formulas from literature and I put these values in ansys to than compare the thin plate (with orthotropic properties) and the corrugated plate. My problem is that to modell a cylinder I need other values such as Ez, shear modulus Gyz Gxz and Poison´s ratio eyz ,exz. I know that it has not so much to do with Ansys but I dont know how to find this from Literature and to apply it in Ansys. Or Should I try different values to see which is more relevant to approach the solution of a corrugated cylinder. If anyone has had the same issue or has knowledge in this direction I would be happy of every advice! Many thanks in advance!

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• CaliforniaMember

Hi,

You can find an example of orthotropic material with parameters in ANSYS Help.

You can also find it in Ansys Help by "Mechanical APDL Technology Demonstration Guide: CHAPTER 29: ROCKET NOZZLE EXTENSION SIMULATION: OPERATION"

Note that for orthotropic material, there's a relationship between Young's modulus and poisson's ration.

nu_yz/E_y = nu_xy/E_x, nu_zx/E_z = nu_xz/E_x, nu_yz/E_y = nu_zy/E_z, Search keyword "orthotropic poisson's ratio " can give you some details.

Also, if your material is transversely isotropic, it put some restriction on the poisson's ratio and sear modulus.

nu_xy/E_x = nu_yx/E_y, nu_yz= nu_zy, G_yz = E_y/2/（1+nu_yz, search keyword “transversely isotropic materials” will give you some details.