LS Dyna

LS Dyna

Multi Layer Cylinder Shell

    • francescocurzio
      Subscriber

      Hi everyone, new LS DYNA user here! I have an issue in the creation on of a multi layer concentrical shell cylinder! Which is the best way to createa model of this type? Now i created the different layers of the model using shape mesher and the cylinder shell option, so every time i have putted the value of the radius of each layer, but in this the way (due to a coarse mesh) in some points i have compenetrations of layers. How can i resolve this one?

      Thanks!

    • Andreas Koutras
      Ansys Employee

      I think I understand the issue. If the mesh is too coarse you cannot avoid these penetrations. In LS-PrePost, you can have the shell thickness displayed by going to: Model and Part -> Appearance -> Thick -> ShellThickness. If you are planning to use contacts between the layers , try with IGNORE=1 or 2 in optional card c of *CONTACT. See the manual for the definition of IGNORE.
      Alternatively, you can use thick shells (tshell) instead of thin shells.
      I hope this helps.

    • francescocurzio
      Subscriber
      thank you so much, i resolved the problem using the same number of elements in the circumfernetial direction for each components. Probably this will lead me to have a coarse mesh in the outer layers, but i cant use an extremely fine mesh in the inner layers due the elevated number of elements in the model.
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