I have been trying to figure out this error as your solved solution what shown on your forum so far but I can't. Could you figure out?
Solved! Go to Solution.
Hi jean.par.3
It is hard to tell from an image, but my guess is that the parts of the assembly are not connected together in the analysis. How did you connect them?
What steps have you taken to try to solve the problem? For example, have you added dummy constraints and loads to all parts so that you can see what is moving and therefore not connected? Have you tried a modal analysis? (See http://knowledge.autodesk.com/article/FATAL-ERROR-E5000-SINGULARITY-DETECTED-in-Nastran-In-CAD)
If that doesn't solve the problem, then please zip the assembly and part files together (use "File > Save As > Pack and Go" if some of the part files in scattered in different locations).
Hello John,
Please see my replies in red color
your Question : Did you define contact? I defined contact as "genera'" and set tol. "0.25" (via nastran in-cad 2016)
your Question : Did you setup continuous meshing? I set "40 mm." for element size and set "0.1" for tol. with checked on continuous meshing. (via nastran in-cad 2016)
your Question : Did you split the faces so that there are matching edges on each part? I did know how to split their faces. Which one I should do "split" or "don't split" (actually I have been following every step of autodesk's tutorial so far)
your Question : Have you added dummy constraints and loads to all parts so that you can see what is moving and therefore not connected Yes I added dummy constraints but I didn't assign load to all parts. I always checked DOF every time after I constraint or joint them and "translation & rotation" are all zero.
My previous checking : I have been checking them by assembly them part by part that, the result are fine (as my attached picture name FEA_CNPV-02.1p_case-post-1set_r1chk2, FEA_CNPV-02.1p_case-post-1set_r1chk3, FEA_CNPV-02.1p_case-post-1set_r1chk4) until I got this fatal error on "FEA_CNPV-02.1p_case-post-1set_r1chk5"
Hello John,
Here is my pack & go file for you to figure out.
NOTE#1 : My pack & go file (jean.par.3.zip) have been created via Inventor 2017 & Nastran In-cad 2017 but this fatal error caused on previous version of Inventor & Nastran In-cad
NOTE#2 : I don't understand why they fine if I analysis them via "Stress Analysis" of Inventor but I couldn't analysis them via Nastran In-cad.
Hello,
I see that you have two analyses set up in the model:
I think the reason the first analysis fails is because there is an interference between the nut and the bolt, so the automatic contact doesn't detect that they should be bonded. When you define the contact manually in the second analysis, it is able to create the contact in spite of the interference. (The bolts and nuts do not have threads; that is just an image in Inventor. So maybe the "bore" through the nut uses the ID of the thread and the "cylinder" of the bolt uses the OK of the thread, and this results in an interference fit between them?)
Since you have defined that all of the parts are bonded, you have several options:
Hello John,
Hi,
If a model has a part that is not statically stable, and therefore gives an error E5000 during a linear static stress analysis, doing a modal analysis will show where the problem occurs as follows:
The images that you attached in "Model Analysis.zip" look to be for a model that does not give error E5000. Is that correct? All of the mode shapes shown in the images look to be valid vibration of the model.
Hello John,
Assembly
FEA
The result shown "SUCCESSFUL"
NOTE : I analyze them via Inventor v.2017 & Nastran In-CAD v.2017 and this Fatal Error occurred on previous version of Inventor & Nastran In-CAD. On previous version of Nastran In-CAD sometime the result after solved it not shown "Solid Von Mises in result data"
Thank you
John
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