Видео

Glad you like them!

Apologies for the late reply - but the answer to your question is yes. (1.) When you generate the report (right mouse click on Analysis in the Model Tree - Generate Report), presuming that you have Min/Max Markers turned on - when the program takes various images for the report, Displacement should be one of those images. The Min/Max markers should display location and value. (2a.) You can get all of the displacement values printed to the *.OUT file. If you double click on the analysis type (e.g. Linear Static) in the Model Tree, this should bring up the Analysis form. The default 'Output Options' pull-down you'll see is set to Plot by default. If you change that setting to Print, it will write all the displacements to the .out file. Note that if you have many nodes in the model, this can make for a very large out file. help.autodesk.com/view/NINCAD/2024/ENU/?guid=GUID-10BFD564-87F7-465B-B3BB-05F61E291DFA (2b.) If there is a smaller region of interest, it might be better to use the XY plot and select an edge of the geometry (for instance) or a few select nodes and then after plotting the values you can export that as a .csv file (which can open in Excel). help.autodesk.com/view/NINCAD/2024/ENU/?guid=GUID-3B982345-7F90-455E-894C-0B20F5D32A09

Hello Jura! Because it is a steady state linear thermal analysis, the program is finding the thermal distribution after some 'infinite' amount of time, so the initial temperatures of the 'other' nodes does not matter because the lowest and highest temperatures in the model will be dictated by the loads that we did apply to the model and all other nodes will end up somewhere between those extremes. That said, two things to note (1.) if no load of any type is applied to a surface, the surface is treated as an adiabatic surface and (2.) the temperature of the other nodes would matter in a transient thermal analysis where we might want to see how fast something heats up or cools down. If it is a transient thermal analysis, then you would want to make sure that an initial temp is defined... this could be done with the 'initial condition' load with the 'sub type' of temperature - or first running a steady thermal to get the starting distribution for the transient analysis. I'll make sure to get to some transient thermal analysis as an example.

@@mikefiedler2039 Thank you for a clear explanation!

Hello Zeinab. This geometry was constructed in Autodesk Fusion 360. The Fusion 360 product has cad modeling abilities along with simulation, drawing creation, rendering and more. You can find more information about that product here www.autodesk.com/products/fusion-360/overview?term=1-YEAR&tab=subscription Disclosure: While these videos are done in my leisure to help educate and promote the use of FEA, they are not officially part of Autodesk formal learning content - though I am an Autodesk employee. Thanks for watching!

You're welcome!

You are welcome!

Hello Adil Apha - thanks for watching the video! So, the z symmetry constraint (or Tz) constraint is really there just added at one end of the model to keep the model statically stable - but I don't want to over constrain the model. To apply the z constraint at the opposite end would restrict any axial expansion or contraction that might happen in the model due to the loading. When we look at one of the radial directions, we do expect it to be a non-gradient result (e.g. same at the top and bottom)... but right, since I didn't control that growth or contraction, the model does experience about .0015" of axial contraction. So, at the 6:41 mark in the video, what is displayed is total displacement - or a combination of the x, y and z components - and because of that difference in the z results, we get the gradient. Good observation, hopefully that explanation makes sense to you. In short though - ultimately the most important thing is trying to make sure that your constraints match the 'real world' as much as possible when it comes time to perform your analysis... and good to observe how the decisions to apply (or not apply) particular constraints influence those results. Take care!

@@mikefiedler2039 Understood. Thank you for your detailed response.

You're very welcome!

Thank you for watching!

Certainly! Thank you for watching!

Hello. Thanks for watching! In reply to your question, 2 different ways to possibly approach this; 1. When adding the constraint, note that 'Constraints' is a pull-down menu. If you change it to 'Pin", then you can apply constraints to be able to fix (or not fix) the radial, axial, and tangential directions. Note this must be applied to cylindrical faces. 2. Otherwise, further down the Model Tree, you should see an entry labeled 'Coordinate System'. There you can define other rectangular, cylindrical and spherical local coordinate systems. The newly defined coordinate systems can then be used when applying either constraints or loads on the model. Applying: knowledge.autodesk.com/support/inventor-nastran/learn-explore/caas/CloudHelp/cloudhelp/2019/ENU/NINCAD-UsersGuide/files/GUID-EB94687D-45AE-4A43-9BFF-6B367E4B59A6-htm.html Using the lcs: knowledge.autodesk.com/support/inventor-nastran/troubleshooting/caas/sfdcarticles/sfdcarticles/How-to-visualize-the-coordinate-system-in-Inventor-Nastran.html.

@@mikefiedler2039 Thank you.

1. When I tried doing the pin constraint, the solver came up with the fatal error "FATAL ERROR "E5000: SINGULARITY DETECTED". The model is very similar to that you have in the video.

@@navalfa7291 Constraints are a fairly common source of that issue. So, you indicated that you were using some pin constraints. Imagine you only constrain the tangential direction on a cylinder. If the loading should cause the model, as a whole, to (for example) translate axially, that would lead to it being statically unstable and end with that error. You should try and ensure that all possible directions of motion are accounted for in some way in a linear static stress model. The simple test to see if that is the source of the error would be to just add a fully fixed constraint somewhere on the part, try and run it again and see if that fixes it. If so, then you can remove the fully fixed constraint and try to apply something more appropriate. Material properties are another source of this error message. You should take a look at the material properties and make sure that all have a reasonable modulus of elasticity and Poisson's ration. If you have gravity or any other type of acceleration, make sure you also have an appropriate material density. The help page for this error message is here; knowledge.autodesk.com/support/inventor-nastran/troubleshooting/caas/sfdcarticles/sfdcarticles/FATAL-ERROR-E5000-in-Nastran-Analysis.html#:~:text=If%20the%20problem%20is%20caused,low)%20values%20in%20material%20properties.&text=If%20G3005%20warnings%20occur%20in,or%20using%20a%20finer%20mesh.