Femap FAQ (English)This page is also available in German Femap FAQ.
03. How can I make Femap output the min and max values of the front- and backside of plate elements combined?
14. How much does Femap cost? [Removed, because the answer was outdated]
15. How much does similar FEM software cost? [Removed, because the answer was outdated]
Wikipedia page of Femap.
DATfile and comments are part of the checksum calculation.
03. How can I make Femap output the min and max values of the front- and backside of plate elements combined?In
From Output Set, and select the appropriate output set. As Vector select
Plate Top and Plate Botand then a new output set with min and max values will be generated. “How can I make Femap output the max and min values of front- and backside of plate elements combined?”
View/Selectchose one of the following options:
Option x-Axis ====== =======
XY vs IDID
XY vs Set OutputSet ID
XY vs Set ValueOutput Set Name, will be interpreted as name (e.g. for Eigenfrequencies).
XY vs PositionPosition along one of the axis
XY vs Function Value
Function vs Value— multiple curves associated with a given quantity
vs Time— time dependent loads for transient analysis
vs Frequency— frequency dependent loads for frequency response analysis
Viscous Damping vs Frequency— damping for transient/frequency response analysis
Critical Damping vs Frequency— damping for transient/frequency response analysis
Amplification vs Frequency— damping for transient/frequency response analysis
Function vs Critical Damping— tables obtained for/from Response Spectrum analysis
vs Temperature— temperature dependent material properties
vs Stress— stress dependent curves for nonlinear material properties
Function vs Temperature— multiple stress/strain curves as a function of strain rate for nonlinear material properties
vs Strain Rate— yield stress as function of strain rate for nonlinear material properties
Function vs Strain Rate— multiple stress/strain curves as a function of strain rate for nonlinear material properties
Stress vs Strain— stress/strain curve for nonlinear material properties
Stress vs Plastic Strain— stress/strain curve for nonlinear material properties for export to those analysis codes that require input in plastic strain
vs Curve Length— define load magnitude as a function of curve length
vs Parametric Length— define load magnitude as a function of parametric length
Dynamic QueryWindow in Femap. Sometimes they stay stuck on the screen and don't disappear automatically. To get rid of them, do:
Delete/Tools/Textand then select all the windows you want to delete. See also: “How can I get information about a certain node or element quickly?”
Dynamic Queryin the manual. Other useful functions are:
Dynamic Query+ left mouse button copies text in the List Window
Dynamic Query+ right mouse button copies text in the Graphic Window To view the test, it must be in the current Group and the screen must be redrawn.
Model/Load Body/Default Temperature
Model/Load/Body/Reference Temperature(is not actually written)
Cards that are used for the response spectrum calculation.
DLOAD -> RLOAD1 or RLOAD2 RLOAD1 -> DAREA -> LSEQ -> LOAD METHOD Refid EIGRL Refid
LSEQ Loadset <-> DAREA RLOAD2 DAREA PLOAD4 DLOAD scales RLOAD2 TABLED1 TID XAXIS YAXIS XY ... Loads TABDMP1 TID TYPE XY XY ... Modal Damping LSEQ SID DAREA LID RLOAD2 SID DAREA DELAY DPHASE TB PLOAD4 SID EID P1 DLOAD FREQ SID F1 FREQ3 SID F1 F2 TYPE NEF
PARAM,POST,-1statememt activates the writing of
PARAM,POST,0statement activates the writing of
PARAM,POST,1statement activates the writing of
Among the output statements in the
Case Control Sectionthere must be
In the document
Result-Destination-Summarythere is an overview of the possible options.
In Femap the output type is chosen in the
NASTRAN Case ControlDialog.
The dialog is available under
In newer versions of Femap it is under
Analysis Setof the
Output Request Dialog.
You can choose from:
Print Only: The output will be written into a
PostProcess Only: The output will be written into a
Print and PostProcess: The output will be written into the
Punch Only: The output will be written into the
Punch and PostProcess: The output will be written into the
Type/Material Orientation. The orientation can be defined with nodes, a vector, a coordinate system or an angle. (
Model/Property.../Elem/Property Type.../Element Material Orientation) (
Modify/Update Elements/Material Angle...)
For volume elements a coordinate system can be set at the assigned property. (
Model/Property.../Elem/Property Type.../Solid/OK/Material Axes) The coordinate system must already be defined. Alternatively the material can be defined with the axis that go through the nodes.
For line elements it is possible to define an element orientation. (
PARAM,MAXRATIO,This value is the threshold for the ratio between matrix diagonal and factor diagonal.
A setting of
PARAM,MAXRATIO,1.E+8is the standard default value.
When the value of
MAXRATIOis exceeded, the value of
BAILOUTdetermines what happens.
PARAM,BAILOUT,0NASTRAN will cancel the analysis run when the threshold is crossed.
threshold is ignored.
Tools/Parametersyou can choose the active coordinate system. This coordinate system is used for the data in
Here is how you can create a bitmap graphic:
- Turn on render mode
- Ctrl + C
- Paste Special
- As Device Independent Bitmap
File/Page Setup/Render Res Factor” does not work as it should.
A vector image can be made like this:
- Turn render mode off
- Ctrl + C
- Paste Special
- As Picture
RBEelements are called “Rigid Elements” in Femap. If an
RBE3element is produced depends on the presence of an interpolation factor in Femap.
rigid= no Factor
interpolation= with Factor
indy /|\ / | \ / | \ dep dep depRigid elements are used to
- model areas that are very stiff compared to the adjoining structure in order to prevent numerical difficulties and often to simplify the model
- used to connect two coincident nodes that have different coordinate systems
RBE3spider (e.g. for bolts)
123 123 123 \ | / \ | / \ | / 123456 /|\ / | \ / | \ 123 123 123
Symmetric Layers” in
Define Property - LAMINATE Elementsis checked, NASTRAN uses twice the specified thickness for analysis. Femap will show the specified thickness though.
RBE2element. A connection with
RBE3seems to work, but it is not entirely clear from the documentation if this is supported.
CELASdo not work here, because they require both nodes to be in the same coordinate system.
Scale Factor -1.
From Output Setselect
To Output Setselect
Another way is to animate the model and create the screenshot in the right moment.
2D Orthotropic) are transformed into
MAT2cards by NASTRAN. It can be useful to have these
MAT2cards and use them for example for plate elements that are laminates. To make NASTRAN output the
MAT2cards it uses internally, use a
statement at the beginning of the bulk file. You can enter this in Femap in “
Model/Analysis/NASTRAN Executive and Solution Options” under “
Start Text”. For current (~2006) NASTRAN versions this is enough, the
MAT2cards will be written as
INFORMATION MESSAGEto the
F06file. For older NASTRAN versions (for example those included in Femap) you need to additionally specify
Model/Analysis/Output Requests/Echo Model
MAT2cards can then be found, together with the
PSHELLcards, in the
TEMPP1. In order to enter one of these via Femap you have to create a dummy temperature load case first. You then have to assign a temperature to an arbitrary node. Then you can enter the card manually under
Model/Analysis/NASTRAN Bulk Data Options/StartFor example:
Caution: Femap uses a proportional font in this dialog, which makes the manual entry nearly impossible. It is better to write the card in a text editor and then copy it into Femap.
$2345678 2345678 2345678 2345678 2345678 2345678 TEMPP1 6 1 0.0 0.4 2 THRU 5000
Model/Load/Nodal/Temperature Method Variable !!!! Temperature dependent on coordinateThen enter
(xnd(!i), ynd(!i), znd(!i))as equation. It will not work if you forget to click “