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Crashphys

Punch File Format for Ply Stress Outputs

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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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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

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On ‎12‎/‎5‎/‎2019 at 1:35 AM, Crashphys 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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