Hello brut3. Can you show us pictures of your mesh or describe what type of mesh you want to get? Maybe you try to create solid mesh on this thin walled part and get errors.
GregLocock
It moves, here is zoomed view.
I made nonlinear analysis (SOL106, Nastran) with geometric nonlinearity.
Yep, that`s what I get when use animated view with setting Linear-Full in Femap. Here is better animation with intermediate nonlinear results.
I am not a Strand7 but I assume that you can and know how to fix any of 6 DOFs in any particular node in your mesh. Than you should use 3-2-1 method to apply additional support to model.
https://www.digitalengineering247.com/article/free-floating-fea-models/
Here is an example, plate located in...
I am not familiar with this exact type of Nastran solver - SOL400 but in general Normal Modes is linear solution only. You can find modes either for closed or open gap. You can use prestressed state from nonlinear static analysis but it still represent only one contact state - either open o...
For initial guess you can decompose complex loading into basic directions and think what modes they excite and what not. Than use higher of possible frequencies. Like you have bending and axial load and axial frequency if bigger than use it.
Than to prove that your timestep is small enough you...
Here I made simple beam model with lateral load that excite first bending mode (811 Hz). You can clearly observe dynamic behavior both on nodes motion and bending moment.
I have included Nastran input files both for Normal Modes and Frequency Response, you can import them into Femap by...
Burner2k
All dynamics begin with Normal Modes. Run normal modes and find first frequency(lambda) of mode that represent rod movement in axial direction.
Now if you want to observe some transient behavior you should apply load at duration with same order as one period of oscillation...
In Nastran axis for axisymmetric elements is hardcodded so you do not need to define it. Your axisymmetric mesh (element types CQUADX4, CQUADX8, CTRAX3, and CTRAX6) should obey those rules (taken from Nastran Quick Refrence Guide, QRG.pdf).
Maybe if O-ring is made from some hard material than it if possible to use formulas for wedge, for example from here.
https://engineeringstatics.org/Chapter_09-block-and-wedge-friction.html
From your pictures P is much lower than Fy but for wedge you should get much bigger P than initial load...
Can you add some pictures with your geometry, mesh, loads, constraints and results and show on them what you are doing.
From my experience I remember that modeling O-ring in the flange is nonlihear problem both due material nonlinearities and sliding contact. Do you model your part as nonlinear...
Yes, now I can recreate error on your model. Interesting. Maybe problem in scaling. Measure distance in model, whole your part is like 0.1x0.1 units, not 30 m as you say. Maybe roundoff errors on such small scale chew up your mesh.
Try to create new model. On empty model before any geometry...
Yep, parts only expands/shrink due to uniform temperature load without stresses if nothing prevent expansion. You should introduce some nonuniform thermal load to get thermal stress in model constrained by 3-2-1 method.
Run your case and check reactions at constrained nodes. If they are zero that nodes do not prevent model expansion because other vice you get some reaction forces.
If your channel can expand freely (as usually heat exchanges do) than you can use 3-2-1 method described here. If you apply constraints properly you get zero or near zero constraint forces at constrained nodes.
https://www.digitalengineering247.com/article/free-floating-fea-models
Recently there...
BioMes
Scuba tank is not open. I don`t know exact design and location but scuba tank should have gas reductor/breathe regulator to reduce breathing gas pressure to allowable value. For strength calculations we can neglect pressure after gas reductor (300 bar in tank and like 0.05...0.1 bar after...
Hello, ecFem.
Your geometry look fairly simple. You need to make a couple additional slices to decompose geometry into simple parts. Use Solid Slice->Using Curve to slice middle cylinder into two collinear cylinders.
Here is my proposal how to divide it into hex meshable parts. 1/4 part of shaft...
