Situation is strange in optistruct

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

When I was applied the pretension in the bolt.

 

I saw the von-Mises (corner Data)in the result.

 

But the situation is strange because I have seen the other software.

 

The result at opitstruct is not distribute average.

 

Where is my error?

 

And my stress will over my applied pretension force ( I change the force to stress)

 

I applied the stress is 212 MPa but my result is 359.6 MPa

 

image.png.42cbfb4489835d12c3559dc80d2dc840.png

 

 

 

 

 

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited April 2018

    @LKZ

     

    Since the information is limited it is hard to comment.

     

    is it possible to share both model files (OptiStruct and Other SOFTWARE)?

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited April 2018

    @Prakash Pagadala Thanks to your reply.

     

    Because another file I just saw it situation so I don't have the file. Sorry.

     

    I want to ask you about how to see the element's von-Mises because I just can see the Nodal stress in HyperView.

     

    Ho do I see the element stress? Because I want to compare to my applied stress to know the stress value is right or not.

     

    4.jpg.92880d7f10d64947b09315948b991c2c.jpg

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited April 2018

    @LKZ

     

    Can you use Query instead of Measures panel?

     

    There you can contour for elements. 

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited April 2018

    @Prakash Pagadala Thanks to your apply!

     

    I have use the Query panel to pick elements and how do I show the element stress.

     

    Really thanks you!

     

    <?xml version="1.0" encoding="UTF-8"?>image.thumb.png.64d028b0c540984fb245f2bb6a97a842.png

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited April 2018

    Hi @LKZ

     

    You should see Contour Element Stress as shown in the image. Select that and select the elements. 

     

    <?xml version="1.0" encoding="UTF-8"?>contur.PNG

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited April 2018

    @Prakash Pagadala Thanks to your apply!

     

    But I can't find this option

     

    image.png.d24f225b275b5833c660c51590a97049.png

     

     

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited April 2018

    @Prakash Pagadala I have found that I will have the option

     

    But it need the Averaging method choose none, it can show the option.

     

    Why it can't measure the stress in Averaging method : simple?

     

    image.png.6b1216305ff1026320705829585c9f36.png

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited April 2018

    Hi LKZ,

     

    You need to uncheck corner data to get the values in query panel. 

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited April 2018

    @Prakash Pagadala Thanks to your reply!

     

    I have uncheck the corner data and my averaging method is simple. 

     

    But I still not have the option of element stress.

     

    My Hyperwork is 2017.2 and I upload my h3d file.

     

     

    image.png.9cbf3796a57f72b56f8f74d2548f4fa0.png

    Unable to find an attachment - read this blog

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited April 2018

    @LKZ

     

    I think I misunderstood your question. You can get the element contour with None and corner data unchecked. 

     

    With simple, you can get the nodal stress results projected from the element. 

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited April 2018

    @Prakash Pagadala 

     

    So the simple method is from each element corners tensor and averaged?

     

    And when we choose the none, the calculated method can see the element stress because it doesn't average to the corner.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited April 2018

    @LKZ

     

    How HV averages can be found from HyperView help.

     

    Please refer to Nodal Averaging of Elemental Results on HyperView help.