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. Nastran model 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 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