Punch File Format for Ply Stress Outputs

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

Hi,

 

What is the file format for ply stresses? 

 

Here is what I have:

 

$TITLE   =   (OS 2017.2)
$SUBTITLE=  
$LABEL   = Slosh
$ELEMENT STRESSES
$REAL OUTPUT
$SUBCASE ID =           1
$ELEMENT TYPE =          95   (CQUAD4 COMP)
    318922                12             -8.670271E+07     -3.871894E+07
-CONT-                 -2.489154E+05      9.592118E+02     -2.192493E+04
-CONT-                 -8.970279E+01     -3.871765E+07     -8.670400E+07
-CONT-                  7.523074E+07

 

This does not appear to be consistent with what is in the help manual. I need the maj. and min. principal stresses, von mises and shear for each ply. Any suggestions on where I can find the format?

 

Thanks in advance.

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Answers

  • PrasannaK
    PrasannaK
    Altair Employee
    edited October 2020

    Hi,

    You can refer to this post: https://community.altair.com/community?id=community_question&sys_id=6c86883a1b2bd0908017dc61ec4bcb8b 

    Thank you.

  • Crashphys
    Crashphys Altair Community Member
    edited December 2019

    Hi,

     

    To clarify, I am not really worried about seeing the results in hyperview. What I want to do is read the data from the PCH file. I have already developped my methodology to read it, but I need to interpret it. 

     

    $ELEMENT TYPE =          95   (CQUAD4 COMP)
        318922                12             -8.670271E+07     -3.871894E+07
    -CONT-                 -2.489154E+05      9.592118E+02     -2.192493E+04
    -CONT-                 -8.970279E+01     -3.871765E+07     -8.670400E+07
    -CONT-                  7.523074E+07

     

    Above are the stresses in the ply. Which value corresponds to which stress? Which of these values is principal, von mises, shear etc?

     

    Thanks

  • Rex_22369
    Rex_22369 Altair Community Member
    edited December 2019
    Altair Forum User said:

    Hi,

     

    To clarify, I am not really worried about seeing the results in hyperview. What I want to do is read the data from the PCH file. I have already developped my methodology to read it, but I need to interpret it. 

     

    $ELEMENT TYPE =          95   (CQUAD4 COMP)
        318922                12             -8.670271E+07     -3.871894E+07
    -CONT-                 -2.489154E+05      9.592118E+02     -2.192493E+04
    -CONT-                 -8.970279E+01     -3.871765E+07     -8.670400E+07
    -CONT-                  7.523074E+07

     

    Above are the stresses in the ply. Which value corresponds to which stress? Which of these values is principal, von mises, shear etc?

     

    Thanks

    I also faced similar problem, but I just fixed, I know what is the problem you want to solve! In Optistruct help document, the format for the stress outputs is not given, so we will confuse with all these stress tensors, it also took me long time to understand the stress tensor during FRF simulation, below is my solution.

    1) First of all,  you need have the .pch file for desired element, all the stress tensors is shown in it, I already saw it in you picture

    2) Then you can load the .h3d file in Hyperview,  and hide all the element except the desired element.

    3) Now you can plot the stress of this element (please keep the averaging method as none),  then compare this contour plot result with your .pch file, by using this way you can understand the format of the stress tensors

    Hope this can help u!

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