That duration of a simulation is fine for Implicit analysis. You should set your ASCII output frequency to however fine you want your data, usually quite a bit finer than your d3plot frequency. I'd try for at least 1000 output points so maybe 28000ms and see if that is fine enough. Note that smaller frequency values will drastically increase the file size of your outputs (.ascii, binout, .d3plot) so be careful with how low to assign it. And with regards to attachments, you'll either need to zip a folder with the files you want to attach (.7z, .rar, .gz, .gzip, .zip) or convert you .k file to a .key file. 7-zip is a free to download software that works well for zipping files, and zip files are smaller so I'd appreciate if you'd zip and then try to attach. If that doesn't work then I'll provide an email for you to send to.
In the future, I'll fill the About page to have guidelines for posting and attaching files. Two weeks is enough time to you to finish this I have no doubt.
do you mean set it to 28000ms for the ASCII options or 280? i'll send you my kfile soon. im making few tweaks and currently running it now. Does it take so much longer when you refine the mesh? just now my simulation was within few mins now im already like 20 mins in and its still running..
Oh you are correct sorry, 280ms for the ASCII options (280000ms total sim/1000 output points=280ms). Yes, refining the mesh will drastically increase computational time. There's something called a mesh refinement study where you find the optimal point of mesh size and accuracy. A mesh of 0.1mm edge length will not give drastically more accurate results than an edge length of 0.5mm, and it will take much much longer. Your element formulation (ELFORM) is going to effect accuracy and runtime as well. I would stick with fully integrated (ELFORM 16) and try increasing the mesh size slightly. If your object is 95mm long, try 1mm edge length. If it takes too long you can stick with the default ELFORM but you will need an hourglass, try HG=3 iq=0.2. Fully integrated elements do not hourglass and therefore do not need one defined.
Finally done! with the square hollow tube. For this im just using termination time 50 and displacement curve (0,0) and (47.5,47.5) because i want to see the end results fast.
The mesh size looks good. One thing to note however, you have modeled this structure with an inner and outer shell. Is this what was required? I would assume that the goal would have been to only model it with a single layer of shells. If that is the case, then you should delete the inner and connecting elements along the top and bottom, so that you only have the outer quad shells remaining. You can then assign a thickness of this single layer of shells to represent the structure that you are trying to model. Let me know if this makes sense.
i'm creating a model based on past journal given to me for guidelines. since i'm not doing any experimental work, i just used the exact same dimensions for the square tube which are Length=38mm, Height= 95mm, thickness= 1.2mm. i made that model using solidwork then imported it to PrePost. In solidwork, i made a square with thickness 1.2mm, and then extruded it to 95mm. i guess that's what you mean by i have an inner shell? So what you are saying is that, i can just make a normal square tube in solidwork without thickness, and then set the thickness in PrePost instead? (see image attached for clarification).
i'm using the same dimensions because i wanted my simulation to produce the same or almost the same outcome as the experimental work done by past paper. This is to validate my results and then with this i can simulate models of different geometries knowing that it would portray results of real life compression made to the tubes.
i've chosen, cylindrical tube, rectangular tube, hexagonal tube. and maybe if i've time i'll do a square tube with a partition in the middle or better else i'll just do 4 tubes but with a different material such as steel.
