von Mises stress discontinuity

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

Hi, to all.
I'm a newbie on optistruct software. I have made two models, with same geometry, the same elements, same material, and same boundary conditions, using hypermesh software. 
In one model i have two different components called 1 and 2. In the second model i have only one component. 
The results of von Mises stress are different. In particular  for the model with 2 components there are discontinuity for the von Mises stress. 
Why the disontinuity ? 
I attach the mages of the models anche .hm files. 

<?xml version="1.0" encoding="UTF-8"?>Two_Components_Image_1.JPG

<?xml version="1.0" encoding="UTF-8"?>Two_Components_Image_2.JPG

<?xml version="1.0" encoding="UTF-8"?>One_Component_Image_1.JPG

<?xml version="1.0" encoding="UTF-8"?>One_Component_Image_2.JPG

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Answers

  • Mario_21478
    Mario_21478 Altair Community Member
    edited August 2018

    Hi Saverio,

     

    I think it depends on how the 'Simple Average' (or any other)) algorithm works.
    By default, the averaging of results stops at component boundaries.

    Without averaging, there is always a gradient from element to element (e.g. switch off averaging).

     

    Try to set the switch at Contour->Average Options->Average across component boundary (Button below Averaging method).

     

    If the structure is not connected by nodes (e.g. by contact only) it isn't possible.

     

    Best Regards,

    Mario

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2018

    Thank you Mario, your advice has been very useful. 

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