stress occurred in SHELL & Solid Plate of Same Config

M.karthickraja
M.karthickraja Altair Community Member
edited October 2020 in Community Q&A

Hi all,

        I had modeled a steel  Plates of two Cases of Same config  as shown in fig.

 

Case :1   2D PLATE  2mm Thickness, F=140N(10N/14 Nodes), constraints at opposite end.

 

Case :2   3D hex Plate  2mm Thickness with 2 Layer of Mesh, F=140N(10N/14 Nodes), constraints at opposite end.

 

Clarification required :

               1. Both plates are same in Boundary conditions , dimensions and material property. only the element type varies but why the stress induced is different ?

       

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Answers

  • PrasannaK
    PrasannaK
    Altair Employee
    edited January 2020

    Hi,

     

    In dynamic analysis when the geometry is borderline between the classification of 2-D and 3-D geometry, 2-D shell elements are preferred over 3-D. This is because shell elements being less stiffer captures the mode shapes accurately and with a fewer number of nodes and elements.

     

    Also, in FEA the result depends on element type and mesh refinement of the model. Thus you are getting variation in stress values. 

     

     

  • Robert Lawson
    Robert Lawson Altair Community Member
    edited January 2020

    M.karthickraja - 

    If you look at corner stress data instead of centroidal stress data, you will likely find the results are much closer.

    - Robert

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