How can I read superficial stresses on 3D castings? How are ´Membrane´ elements declared in Optistruct?

Joel Rodarte
Joel Rodarte New Altair Community Member
edited October 2020 in Community Q&A

Hello,

 

In Ansys and Abaqus solvers I Used to apply a 'Skin' (2D elements based on the outer surface of 3D elements) on castings in order to read superficial stresses in Hyperview. These elements were membrane elements and were declared different than regular shell elements.
 

For Optistruct which type of element is the one suited as membrane element?

Is there any other approach to read superficial stress on castings?

 

Here is an image of the availabre trias type of elements, which one should I Use?

 

<?xml version="1.0" encoding="UTF-8"?>elementtypes.thumb.png.5c756fd872b334a09e5bbe24d3389f6f.png

 

 

Thank you for your time!

 

Answers

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited June 2019

     You can model the shell as membrane, by setting the MID2/3=0.0 (basically we are reducing the bending stiffness to zero, it will act like a membrane). which we can do by editing the PSHELL property card. 

  • Joel Rodarte
    Joel Rodarte New Altair Community Member
    edited June 2019

    Thank you for the idea Rahul. Had not tough about it.

     

    Thank you for you time.

     

    Regards,

     

     

  • Joel Rodarte
    Joel Rodarte New Altair Community Member
    edited August 2019

     You can model the shell as membrane, by setting the MID2/3=0.0 (basically we are reducing the bending stiffness to zero, it will act like a membrane). which we can do by editing the PSHELL property card. 

     

    Hello Rahul,

     

    By setting MID2/3 = 0 you mean making them have the BLANK option?

     

    I cannot modify the value of MID2 and MID3 numerically to be 0. I attached an image.


     

     

     

     

     

     

    <?xml version="1.0" encoding="UTF-8"?>MID2.png