Dear All,
Does anyone have an idea how to simulate this type of connector, in Nastran, between two points similar to abaqus? Here is the link to the definition.
http://abaqus.software.polimi.it/v6.12/books/usb/default.htm?startat=pt06ch31s01aus110.html#usb-elm-econnector-slide-plane
My...
Dear All,
I am trying to develop a new SN curve within Ncode Designlife using the material manager. Using the fatigue theory guide I generate all the parameters for aluminum uisng the equations given and the UTS of the material. I chart this in excel and everything looks good. The B1 value...
HI,
I am running a fatigue analysis in n-code and was trying to find out a way to run the analysis using time steps and eliminate the pre-load after the first cycle.
I run the time sequence in nastran for one fully reversed cycle including the pre-load. I post process in n-code and get good...
New to fatigue analysis and have a few fundamental questions of anyone would care to comment. Based on what I think I know is that a (S-N) stress based approach is best for high cycle fatigue and a (E-N) strain based approach for low cycle fatigue. The cut off generally being around 100K...
New to fatigue analysis and have a few fundamental questions of anyone would care to comment. Based on what I think I know is that a (S-N) stress based approach is best for high cycle fatigue and a (E-N) strain based approach for low cycle fatigue. The cut off generally being around 100K...
Dear All,
I am trying to perform an analysis on an aluminum part using a time varying load. Ultimately I will use these stresses for input into a fatigue analysis. As a test I run a static analysis (sol 101) at 8KN and the stresses are very low around 75 MPA. However, as mentioned I need...
Greetings,
I am setting up a durability analysis within the advanced simulations module based on a linear static analysis of several events. It is on an aluminum cast part for suspension.
I set up a durability solution with one static event and add three excitations based on three sub-cases...
Greetings,
I am trying to simulate a linear static analysis on a 4 bar linkage. I am using cbar2 to connect and releasing the proper DOF for rotation. Under lower loads (smaller rotation) everything seems to work okay. When I get to a higher load (larger rotation) the model solves but I am seen...
Dear All,
Can someone please explain to me in more detail the FRICMOD option in NX Nastran Sol 601. It appears that FRICMOD=4 requires three parameters A1,A2,A3. I believe that A1=Static and A2-Dyanmic but am not sure what A3=?? I believe that it may be speed but the documentation is very...
Dear All,
I am running a fairly simple non -linear material analysis of a plastic clip in UGNX sol 601. The stress strain curve has a slight negative slope in the plastic region and I have noticed that the solver seems to stop at the peak of the curve just before it starts down in the...
Blas,
Thanks, I actual found the UGNX tool that allows me to deselect the frequencies that have no or little contribution to the mass effects. Out of 100 frequencies I cut the run times down from 8hrs to 2 hrs.
One last strange thing that I found is related to units. The PSD chart I has the...
Thanks,
How many normal modes do you think is acceptable for the random vibration RMS stress accuracy? I am sweeping between 0 and 2000 hz and it finds 102 modes. This runs the solution time way up high and I was looking for a way to cut down the run times. I checked the .f06 file and it...
Dear Blas,
thanks, I agree the interface is very confusing but I think i did figure it out. Please let me know your thoughts.
I ran a sol 103 response and sweep thru about 100 modes.
I added a response to the results and picked the random event.
I added the enforced motion at the point when...
Dear Rothers,
Thanks for the response. This is what I was given in the form of a PSD table. So if I want just the acceleration in (m/s2) I would time the value by the given frequency and take the square root? Next create a table of frequency (Hz) vs Acceleration (m/s2) and apply this as an...
Dear All,
I am new to vibration analysis and could use some direction in UGNX 8.5. My customer supplied me with a PSD input table which plots frequency (Hz) vs PSD (g)2 or (m/s2)^2. There are about 15 entries and I am not sure what solution to use and how to input this into the model. The...
