ABAQUS: coordinates and strain values do not match

[gkapitanov]

Hi,

A simple project - we have a rectangle, a load is evenly applied on a centered line on its top, and we have to record the point coordinates and the axial strain at those coordinates. Everything seems right, the abasus picture output is a symmetrical strain field, as expected(attached picture). However, when I extract the data points' coordinates and corresponding strains and plot them on matlab, the result is off (third post picture). I want data that resembles the abaqus output - what am I doing wrong? MATLAB output is not the problem - the problem is that the coordinates do not match the strains. The code I use for extracting the data is below. Thanks for any help.



from odbAccess import *

#open file to write on and the odb

f = open('/space/gkapitanov/Desktop/gkapitanov_ayati_lab/Pseudo_ABAQUS_Plot/Full_data2.txt', 'wab')

odb = openOdb(path='/space/gkapitanov/Desktop/gkapitanov_ayati_lab/Pseudo_ABAQUS_Plot/Blunt_result2.odb')

# set up the extract

pointData = odb.rootAssembly.instances['DISK-1'].nodes;

#last frame

modelFrame = odb.steps['Step-2'].frames[-1]

strain = modelFrame.fieldOutputs['E']

# define a variable for the values of the strain data

field Values = strain.values

for v in fieldValues:

labelVar = v.elementLabel

x_var = pointData[labelVar].coordinates[0]

y_var = pointData[labelVar].coordinates[1]

f.write('%6.9f %6.9f %6.9f\n' % (x_var, y_var, v.data[2]))

odb.close()

f.close()

 

[gkapitanov]

Here's the set up.

 

[gkapitanov]

And the MATLAB result.

 

[testing]

If you want to plot the deformed coordinates, you'll need to pull out the deformations as well to add to the coordinates you've extracted

 

[gkapitanov]

Zwtipp05,
Thank you for your response. I don't want the deformed coordinates. I simply want the strains and at which point they were calculated.
Furthermore, the deformations are calculated at the node values, while the strains are calculated at the integration points. And plotting the deformed values on MATLAB only deforms the rectangle itself but not the strain field.