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How to use Standard Shell Idealization in Pro-Mechanica

written by: Suvo • edited by: Lamar Stonecypher • updated: 12/5/2009

In many practical applications you'll see that apart from heavy solid structure there are some portions made up of plate or sheet metal kind of structure, for the situation like this you need to use shell idealization along with solid in pro mechanica. We'll learn to use Slandered shell idealization

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    The purpose of the shell elements is to produce more effective model, means the model which will take less computer resources. You can create two types of shell elements in pro mechanica:

    • Standard shell
    • Midsurface shell

    Standard shell: You may face many situation where you have to create a single shell as a layer on one side of your solid model (like you create in plane stress problem) or you may need to create a pair of shell where both the shells are made up of different materials than the rest of your model or if you want to add properties like laminates/material orientation, then you have to go for standard shell.

    Click insert>shell to create, it will open shell definition dialogue box:Fig.1:Shell defination dialogue box  

    Give a name and select the surface/surfaces which you would like to create shell for.

    • Type: You have two options to select type. Simple and advanced.

    If you select simple then you simply specify thickness and material, and your job is over.

    Incase you would like to have fun with multilayered (laminates)/multi properties shell or your analysis demands so then you have no options but to select the advanced type. Once you do so you will observe a little change in the shell definition dialogue box. Instead of thickness field you will get shell property field and material orientation field, like below:

    Shell defination dialogue box for advanced shell option  

    Click on the more aside the shell property field and it will open shell properties dialogue box, click on new and it will open shell property definition dialogue box. You can define any one of these properties: Homogeneous, Laminate Stiffness, Laminate Layup.

    You will select homogeneous for single layered shell and just specify shell thickness. This is as good as simple shell.

    For multilayered laminates either you define laminate stiffness or laminate layup. In laminate stiffness you have to define the stiffness in matrix form .In laminate layup, you have to define the property in terms of number of ply of laminate, orientations of each of them, thickness and material, and you can review the stiffness calculated from the material properties.

    For thermal model the laminate stiffness is unavailable and for 2D model only homogeneous model is available.

    Next you have to define material orientation similarly, incase of advanced shell type.