Learning Forum

[hsfyah]

Hi all!

In a single simulation, I can easily export the nodes results by just clicking on the image like this:

[peteroznewman]

nWhy do you need the stress of each node? That seems like 99% unimportant information and 1% important information.nUnder Analysis Settings change the Number of Steps to 5.nThen on the Details of the Pressure load, there is Tabular Input, just type the 5 values you want to sweep over.nThe solver will be able to show you the stress results at each step, but you could just take the Tabular Data of the Stress plot, which will have a column for the Maximum Stress at each step.nYou can copy and paste the data from those columns into Excel to plot Maximum Stress vs Pressure.n

[hsfyah]

I want to investigate the failure of my model. (Later to be exported to machine learning part, so I kinda need lots of data)nHence, I'm analyzing it from the nodes perspective to prove this:n*It might not make sense,idk but what say you? Do you have any idea on proving the failure of the model other than Von Mises stress?n n

[peteroznewman]

nIt would be helpful to define what you mean by failure. In a pressure vessel, there can be many failure modes and each one has a different metric that best predicts the onset of failure.nOne failure mode is leakage at the joint. Many joints will have a gasket, while some joints use O-rings. Contact pressure of the O-ring to the flange would be a good predictor of leakage failure. Material properties can be temperature dependent, especially O-rings. Look up the Challenger disaster.nAnother failure mode is a burst pipe. There are different metrics for different materials. nDuctile materials will begin to plastically deform, therefore your model must have plasticity defined in the material model. A relevant metric for predicting failure is Total Equivalent Strain, which is compared against Elongation at Break. nBrittle materials will fracture. For a simple analysis, Ultimate Tensile Strength predicts fracture, but a more sophisticated analysis is to understand that fracture is more likely to occur at a pre-existing micro-crack that grows over time to a critical crack length. The fracture failure is predicted by the computing the Stress Intensity Factor (SIF) using the Fracture Tool, which is compared against the critical SIF.n

[hsfyah]

Hi Array ! nWow that's a lot of good ideas and suggestions. Thank you so much! nI have one final questions, do you have any idea on what does the output controls : Nodal forces do here?nBecause when I change it to Yes, nothing changes, I guess?n