========================
Features and limitations
========================

Nasca has some limitations the user needs to know. Those limitations may or may
not be definitive, since the code is in constant development.

----------
Input data
----------

For now (rev 1), only NX NASTRAN is supported, and this in a certain extent. 

The NASTRAN model (*.dat*, *.nas*, etc) needs to match:

  * fixed format (8 columns)
  * only a few cards supported for now (cf. :ref:`nastran_cards`)

The NASTRAN result file (*.f06*), needs to match NX NASTRAN syntax.  

---------------
Outputs Reading
---------------

Corners data
""""""""""""

QUAD4 corners data extrapolation are ignored. This means taht for QUAD4 forces
and stresses, whatever the output request was, only the centroïd value is read.


.. _nastran_cards:

-------------------
Nastran model cards
-------------------

The nasca's nastran *.dat* reader is able to handle the following Nastran Bulk Cards:

Coordinates Systems Cards
"""""""""""""""""""""""""

  * CORD2C -- Cylindrical
  * CORD2R -- Rectangular
  * CORD2S -- Spherical

Property Cards
""""""""""""""

  * PBAR -- Bar Property
  * PBEAM -- Beam Property
  * PBUSH -- Spring-and-Damper Property
  * PCOMP -- Layered Composite Element Property
  * PGAP -- Gap Property
  * PROD -- Rod Property
  * PSHELL -- Shell Element Property
  * PSOLID -- Properties of Solid Elements

Material Cards
""""""""""""""

  * MAT1 -- Isotropic Material Property Definition
  * MAT8 -- Shell Element Orthotropic Material Property Definition

Elements Cards
""""""""""""""

  * CBAR -- Simple Beam Element Connection
  * CBEAM -- Beam Element Connection
  * CBUSH -- Generalized Spring-and-Damper Connection
  * CGAP -- Gap or Friction Element
  * CONM2 -- Concentrated Mass Element Connection, Rigid Body Form
  * CQUAD4 -- Quadrilateral Plate Element Connection
  * CROD -- Rod Element Connection
  * CTRIA3 -- Triangular Plate Element Connection
  * RBE2 -- Rigid Body Element, Form 2
  * RBE3 -- Rigid Body Element, Form 3

--------------------
Nastran results file 
--------------------


the following vectors are readable:

Oloads Resultant (Nasca Vector #1):
"""""""""""""""""""""""""""""""""""
F06 title::

  OLOAD    RESULTANT 

Axis (Nasca axis / FEMAP equivalent axis):

+--------------+--------------+
| nasca vector | femap vector |
+==============+==============+
| load type    |              |
+--------------+--------------+
| t1           |              |
+--------------+--------------+
| t2           |              |
+--------------+--------------+
| t3           |              |
+--------------+--------------+
| r1           |              |
+--------------+--------------+
| r2           |              |
+--------------+--------------+
| r3           |              |
+--------------+--------------+

Displacements Vectors (Nasca Vector #10):
"""""""""""""""""""""""""""""""""""""""""
F06 title::

  D I S P L A C E M E N T   V E C T O R

Axis (Nasca axis / FEMAP equivalent axis):

+--------------+--------------------------------+
| nasca vector | femap vector                   |
+==============+================================+
| gid          | *index*                        |
+--------------+--------------------------------+
| type         | *index*                        |
+--------------+--------------------------------+
| t1           | ``2..T1 Translation/Rotation`` |
+--------------+--------------------------------+
| t2           | ``3..T2 Translation/Rotation`` |
+--------------+--------------------------------+
| t3           | ``4..T3 Translation/Rotation`` |
+--------------+--------------------------------+
| r1           | ``6..R1 Translation/Rotation`` |
+--------------+--------------------------------+
| r2           | ``7..R2 Translation/Rotation`` |
+--------------+--------------------------------+
| r3           | ``8..R3 Translation/Rotation`` |
+--------------+--------------------------------+

Load Vectors (Nasca Vector #11):
""""""""""""""""""""""""""""""""
F06 title::

  L O A D   V E C T O R

Axis (Nasca axis / FEMAP equivalent axis):

+--------------+---------------------------------+
| nasca vector | femap vector                    |
+==============+=================================+
| gid          | *index*                         |
+--------------+---------------------------------+
| type         | *index*                         |
+--------------+---------------------------------+
| t1           | ``42..T1 Applied Force/Moment`` |
+--------------+---------------------------------+
| t2           | ``43..T2 Applied Force/Moment`` |
+--------------+---------------------------------+
| t3           | ``44..T3 Applied Force/Moment`` |
+--------------+---------------------------------+
| r1           | ``46..R1 Applied Force/Moment`` |
+--------------+---------------------------------+
| r2           | ``47..R2 Applied Force/Moment`` |
+--------------+---------------------------------+
| r3           | ``48..R3 Applied Force/Moment`` |
+--------------+---------------------------------+

Forces On Spc Constraints (Nasca Vector #12):
"""""""""""""""""""""""""""""""""""""""""""""
F06 title::

  F O R C E S   O F   S I N G L E - P O I N T   C O N S T R A I N T

Axis (Nasca axis / FEMAP equivalent axis):

+--------------+------------------------------------+
| nasca vector | femap vector                       |
+==============+====================================+
| gid          | *index*                            |
+--------------+------------------------------------+
| type         | *index*                            |
+--------------+------------------------------------+
| t1           | ``52..T1 Constraint Force/Moment`` |
+--------------+------------------------------------+
| t2           | ``53..T2 Constraint Force/Moment`` |
+--------------+------------------------------------+
| t3           | ``54..T3 Constraint Force/Moment`` |
+--------------+------------------------------------+
| r1           | ``56..R1 Constraint Force/Moment`` |
+--------------+------------------------------------+
| r2           | ``57..R2 Constraint Force/Moment`` |
+--------------+------------------------------------+
| r3           | ``58..R3 Constraint Force/Moment`` |
+--------------+------------------------------------+

Forces In Quad4 (Nasca Vector #14):
"""""""""""""""""""""""""""""""""""
F06 title::

  F O R C E S   I N   Q U A D R I L A T E R A L   E L E M E N T S

Axis (Nasca axis / FEMAP equivalent axis):

+--------------+-----------------------------------------+
| nasca vector | femap vector                            |
+==============+=========================================+
| eid          | *index*                                 |
+--------------+-----------------------------------------+
| fx           | ``7206..Fx Plate Membrane/Transverse``  |
+--------------+-----------------------------------------+
| fy           | ``7207..Fy Plate Membrane/Transverse``  |
+--------------+-----------------------------------------+
| fxy          | ``7208..Fxy Plate Membrane/Transverse`` |
+--------------+-----------------------------------------+
| mx           | ``7211..Mx Plate Membrane/Transverse``  |
+--------------+-----------------------------------------+
| my           | ``7212..My Plate Membrane/Transverse``  |
+--------------+-----------------------------------------+
| mxy          | ``7213..Mxy Plate Membrane/Transverse`` |
+--------------+-----------------------------------------+
| qx           | ``7214..Qx Plate Membrane/Transverse``  |
+--------------+-----------------------------------------+
| qy           | ``7215..Qy Plate Membrane/Transverse``  |
+--------------+-----------------------------------------+

Forces In Tria3 (Nasca Vector #15):
"""""""""""""""""""""""""""""""""""
F06 title::

  F O R C E S   I N   T R I A N G U L A R   E L E M E N T S

Axis (Nasca axis / FEMAP equivalent axis):

+--------------+-----------------------------------------+
| nasca vector | femap vector                            |
+==============+=========================================+
| eid          | *index*                                 |
+--------------+-----------------------------------------+
| fx           | ``7206..Fx Plate Membrane/Transverse``  |
+--------------+-----------------------------------------+
| fy           | ``7207..Fy Plate Membrane/Transverse``  |
+--------------+-----------------------------------------+
| fxy          | ``7208..Fxy Plate Membrane/Transverse`` |
+--------------+-----------------------------------------+
| mx           | ``7211..Mx Plate Membrane/Transverse``  |
+--------------+-----------------------------------------+
| my           | ``7212..My Plate Membrane/Transverse``  |
+--------------+-----------------------------------------+
| mxy          | ``7213..Mxy Plate Membrane/Transverse`` |
+--------------+-----------------------------------------+
| qx           | ``7214..Qx Plate Membrane/Transverse``  |
+--------------+-----------------------------------------+
| qy           | ``7215..Qy Plate Membrane/Transverse``  |
+--------------+-----------------------------------------+

Forces In Mpc (Nasca Vector #16):
"""""""""""""""""""""""""""""""""
F06 title::

  F O R C E S   O F   M U L T I P O I N T   C O N S T R A I N T

Axis (Nasca axis / FEMAP equivalent axis):

+--------------+-------------------------------------+
| nasca vector | femap vector                        |
+==============+=====================================+
| gid          | *index*                             |
+--------------+-------------------------------------+
| type         | *index*                             |
+--------------+-------------------------------------+
| t1           | ``152..T1 Multipoint Force/Moment`` |
+--------------+-------------------------------------+
| t2           | ``153..T2 Multipoint Force/Moment`` |
+--------------+-------------------------------------+
| t3           | ``154..T3 Multipoint Force/Moment`` |
+--------------+-------------------------------------+
| r1           | ``156..R1 Multipoint Force/Moment`` |
+--------------+-------------------------------------+
| r2           | ``157..R2 Multipoint Force/Moment`` |
+--------------+-------------------------------------+
| r3           | ``158..R3 Multipoint Force/Moment`` |
+--------------+-------------------------------------+

Lam Ply (Nasca Vector #17):
"""""""""""""""""""""""""""
F06 title::

  S T R E S S E S   I N   L A Y E R E D   C O M P O S I T E   E L E M E N T S

Axis (Nasca axis / FEMAP equivalent axis):

+--------------+--------------+
| nasca vector | femap vector |
+==============+==============+
| eid          |              |
+--------------+--------------+
| ply_id       |              |
+--------------+--------------+
| normal-1     |              |
+--------------+--------------+
| normal-2     |              |
+--------------+--------------+
| shear-12     |              |
+--------------+--------------+
| shear xz-mat |              |
+--------------+--------------+
| shear yz-mat |              |
+--------------+--------------+
| angle        |              |
+--------------+--------------+
| major        |              |
+--------------+--------------+
| minor        |              |
+--------------+--------------+
| shear        |              |
+--------------+--------------+

Nodes Force Balance (Nasca Vector #18):
"""""""""""""""""""""""""""""""""""""""
F06 title::

  G R I D   P O I N T   F O R C E   B A L A N C E

Axis (Nasca axis / FEMAP equivalent axis):

+--------------+--------------+
| nasca vector | femap vector |
+==============+==============+
| gid          |              |
+--------------+--------------+
| eid          |              |
+--------------+--------------+
| source       |              |
+--------------+--------------+
| t1           |              |
+--------------+--------------+
| t2           |              |
+--------------+--------------+
| t3           |              |
+--------------+--------------+
| r1           |              |
+--------------+--------------+
| r2           |              |
+--------------+--------------+
| r3           |              |
+--------------+--------------+

Forces In Rod Elements (Nasca Vector #19):
""""""""""""""""""""""""""""""""""""""""""
F06 title::

  F O R C E S   I N   R O D   E L E M E N T S

Axis (Nasca axis / FEMAP equivalent axis):

+--------------+--------------+
| nasca vector | femap vector |
+==============+==============+
| eid          |              |
+--------------+--------------+
| axial force  |              |
+--------------+--------------+
| axial torque |              |
+--------------+--------------+

Forces In Beam Elements (Nasca Vector #20):
"""""""""""""""""""""""""""""""""""""""""""
F06 title::

  F O R C E S   I N   B E A M   E L E M E N T S

Axis (Nasca axis / FEMAP equivalent axis):

+----------------+--------------+
| nasca vector   | femap vector |
+================+==============+
| eid            |              |
+----------------+--------------+
| end            |              |
+----------------+--------------+
| gid            |              |
+----------------+--------------+
| length         |              |
+----------------+--------------+
| moment 1       |              |
+----------------+--------------+
| moment 2       |              |
+----------------+--------------+
| web shear 1    |              |
+----------------+--------------+
| web shear 2    |              |
+----------------+--------------+
| axial force    |              |
+----------------+--------------+
| total torque   |              |
+----------------+--------------+
| warping torque |              |
+----------------+--------------+

Forces In Bush Elements (Nasca Vector #21):
"""""""""""""""""""""""""""""""""""""""""""
F06 title::

  F O R C E S   I N   B U S H   E L E M E N T S

Axis (Nasca axis / FEMAP equivalent axis):

+--------------+--------------+
| nasca vector | femap vector |
+==============+==============+
| eid          |              |
+--------------+--------------+
| fx           |              |
+--------------+--------------+
| fy           |              |
+--------------+--------------+
| fz           |              |
+--------------+--------------+
| mx           |              |
+--------------+--------------+
| my           |              |
+--------------+--------------+
| mz           |              |
+--------------+--------------+

Stresses In Quad Elems (Nasca Vector #22):
""""""""""""""""""""""""""""""""""""""""""
F06 title::

  S T R E S S E S   I N   Q U A D R I L A T E R A L   E L E M E N T S

Axis (Nasca axis / FEMAP equivalent axis):

+----------------+--------------+
| nasca vector   | femap vector |
+================+==============+
| eid            |              |
+----------------+--------------+
| loc            |              |
+----------------+--------------+
| fiber distance |              |
+----------------+--------------+
| normal x       |              |
+----------------+--------------+
| normal y       |              |
+----------------+--------------+
| shear xy       |              |
+----------------+--------------+
| angle          |              |
+----------------+--------------+
| major          |              |
+----------------+--------------+
| minor          |              |
+----------------+--------------+
| vm             |              |
+----------------+--------------+

Stresses In Tria Elems (Nasca Vector #23):
""""""""""""""""""""""""""""""""""""""""""
F06 title::

  S T R E S S E S   I N   T R I A N G U L A R    E L E M E N T S

Axis (Nasca axis / FEMAP equivalent axis):

+----------------+--------------+
| nasca vector   | femap vector |
+================+==============+
| eid            |              |
+----------------+--------------+
| loc            |              |
+----------------+--------------+
| fiber distance |              |
+----------------+--------------+
| normal x       |              |
+----------------+--------------+
| normal y       |              |
+----------------+--------------+
| shear xy       |              |
+----------------+--------------+
| angle          |              |
+----------------+--------------+
| major          |              |
+----------------+--------------+
| minor          |              |
+----------------+--------------+
| vm             |              |
+----------------+--------------+