Hello Friends,
I am working on the project of analysing the failure of the diaphragm used in a vent valve. The valve supposed to work for 80cycles failed at 40 cycles. Analysing the deformed part we decided to carry out a step wise approach in Ansys. First the analysis was carried out using the static methodology, and considering the non_ linearities. A time step of 5 was given but the the unconverged solution was obtained at 0.2. The operating pressure is 50bar. But the solution didnot converge at apressure of 1 bar. I am not sure with the ARC LENGTH method. Some of my colleague told it mmight be the case of the snap through buckling.
I want guidance on how to approach the problem. And how to carry out the problem in LS Dyna and the Transient. Please provide me step wise expalnation on the approach for the problem.
Thanks for the consideration.
Bye
G.Mohana Durga Prasad
You might use Non-linear stabilization algorithm
According to my experience, your problem may be snap through one and arc-length algorithm can deal with it. In general, the limit load is considered to reach as long as the arc lengh starts to decrease in ANSYS. This is because the nonlinear calculation performance of ANSYS does not work well like ABAQUS and NASTRAN. Besides, if you use ABAQUS, you may select either Non-linear stabilization algorithm or arc-length algorithm. In my previous study, the Non-linear stabilization algorithm exhibits more preferable calculation efficiency than the arc-length algorithm in ABAQUS. Maybe, you might try them.
According to my
According to my experience, your problem may be snap through one and arc-length algorithm can deal with it. In general, the limit load is considered to reach as long as the arc lengh starts to decrease in ANSYS. This is because the nonlinear calculation performance of ANSYS does not work well like ABAQUS and NASTRAN. Besides, if you use ABAQUS, you may select either Non-linear stabilization algorithm or arc-length algorithm. In my previous study, the Non-linear stabilization algorithm exhibits more preferable calculation efficiency than the arc-length algorithm in ABAQUS. Maybe, you might try them.