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vmap_import.rst

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Reading a VMAP file

The most common use case is to get the element nodal stress tensor for a certain geometry 1 and a certain load state STATE-2 out of the vmap file. The vmap interface provides you the nodal geometry (node coordinates), the mesh connectivity index and the field variables.

You can retrieve a DataFrame of the mesh with the desired variables in just one statement.

>>> (pylife.vmap.VMAPImport('demos/plate_with_hole.vmap')
     .make_mesh('1', 'STATE-2')
     .join_coordinates()
     .join_variable('STRESS_CAUCHY')
     .join_variable('E')
     .to_frame())
                            x         y    z        S11       S22  S33        S12  S13  S23       E11       E22  E33       E12  E13  E23
element_id node_id
1          1734     14.897208  5.269875  0.0  27.080811  6.927080  0.0 -13.687358  0.0  0.0  0.000119 -0.000006  0.0 -0.000169  0.0  0.0
           1582     14.555333  5.355806  0.0  28.319006  1.178649  0.0 -10.732705  0.0  0.0  0.000133 -0.000035  0.0 -0.000133  0.0  0.0
           1596     14.630658  4.908741  0.0  47.701195  5.512213  0.0 -17.866833  0.0  0.0  0.000219 -0.000042  0.0 -0.000221  0.0  0.0
           4923     14.726271  5.312840  0.0  27.699907  4.052865  0.0 -12.210032  0.0  0.0  0.000126 -0.000020  0.0 -0.000151  0.0  0.0
           4924     14.592996  5.132274  0.0  38.010101  3.345431  0.0 -14.299768  0.0  0.0  0.000176 -0.000038  0.0 -0.000177  0.0  0.0
...                       ...       ...  ...        ...       ...  ...        ...  ...  ...       ...       ...  ...       ...  ...  ...
4770       3812    -13.189782 -5.691876  0.0  36.527439  2.470588  0.0 -14.706686  0.0  0.0  0.000170 -0.000040  0.0 -0.000182  0.0  0.0
           12418   -13.560289 -5.278386  0.0  32.868889  3.320898  0.0 -14.260107  0.0  0.0  0.000152 -0.000031  0.0 -0.000177  0.0  0.0
           14446   -13.673285 -5.569107  0.0  34.291058  3.642457  0.0 -13.836027  0.0  0.0  0.000158 -0.000032  0.0 -0.000171  0.0  0.0
           14614   -13.389065 -5.709927  0.0  36.063541  2.828889  0.0 -13.774759  0.0  0.0  0.000168 -0.000038  0.0 -0.000171  0.0  0.0
           14534   -13.276068 -5.419206  0.0  33.804211  2.829817  0.0 -14.580153  0.0  0.0  0.000157 -0.000035  0.0 -0.000181  0.0  0.0

[37884 rows x 15 columns]

Supported features

So far the following data can be read from a vmap file

Geometry

  • node positions
  • node element index

Field variables

Any field variables can be read and joined to the node element index from the following locations:

  • element
  • node
  • element nodal

In particular, field variables at integration point location cannot cannot be read, as that would require extrapolating them to the node positions. This functionality is not available in pyLife.

The VMAPImport Class

.. autoclass:: pylife.vmap.VMAPImport
        :undoc-members:
        :members:
        :inherited-members: