Stress output and resolved in Global system

Nathan_22110
Nathan_22110 Altair Community Member
edited October 2020 in Community Q&A

Hello all,

 

I noticed that stresses results depend on the coordinate system you use in HyperView, and that makes sense. I understood that Analysis System option gives the result as it is calculated by the solver, and according to HyperView User's Guide it depends on the type of element: 'different elements in a model can have different systems, depending on the way they were defined in the results file. For example, a shell element can be in terms of its elemental system whereas a solid element could be in terms of the global system'. In order to get the correct stress value if we want to work in the global coordinates system, we only have to switch 'analysis system' to 'Global system, (proj none)' in HyperView.

 

However, while doing Frequency Response Analysis, I would like to plot Stress over frequency sigma=graph(freq). It seems not be possible to export these values in a 'HG' format to plot it in HyperGraph, so i tried with 'Builds Plot' tool directly in HyperView, and it can plot stresses over frequency, but only stresses in 'Analysis System' if I'm not wrong. What I would like to do is plotting a graph with stress in Global System coordinate for 2D Shell elements.

I tried to associate the global system and even a user defined coordinate as MCID in Card Edit, Elements, but it didn't change anything.

 

Therefore, do you know if it is possible to choose an output option in OptiStruct to plot such a graph, or something that can do it directly in HyperView?

 

Thank you very much

 

 

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Answers

  • tinh
    tinh Altair Community Member
    edited May 2020

    Hi,

    what stress did you plot?

    only stress components depend on system. If you plot principle stresses, or equivalence stresses (Von Misses, Tresca) then don't care about system

  • Nathan_22110
    Nathan_22110 Altair Community Member
    edited May 2020
    Altair Forum User said:

    Hi,

    what stress did you plot?

    only stress components depend on system. If you plot principle stresses, or equivalence stresses (Von Misses, Tresca) then don't care about system

    Hi,

    Yes Tinh I know that equivalent stress are not system-dependent. I plotted Sxx (or Syy) stress

  • tinh
    tinh Altair Community Member
    edited May 2020

    Hyperview should have an option to plot them in resolved system. Or you have to try creating derived results before plotting

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