2D Plate with a Hole using ANSYS Workbench
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- Опубліковано 4 жов 2024
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This video is a tutorial on how to perform a finite element analysis of a plate with a hole using ANSYS Workbench and 2D plane stress elements. We start off by describing the problem and obtaining an analytical solution using simple stress theory and stress concentration factors. We then perform two separate analyses: first an analysis of the full plate and secondly an analysis of quarter of the plate using symmetry. During the first analysis we show the problems that arise when trying to model the full plate and how we can use named selections and a singly constrained node to overcome these problems. We also demonstrate how to refine a 2D plane mesh. In the second analysis we show how to use symmetry regions in workbench to define the symmetry planes and we show how to control mesh sizing using line biasing.
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Thank you, that was helpful!
Glad it was helpful! Thanks for the comment.
really helpful, thank a lot
Glad it helped!
thank you sir
Nice video
Thanks!
Thanks for the video. Was really helpful.
One question though , the way you applied the boudary conditions seemed a little redundant to me.
If I was doing this analysis I probably would have gone with fixed support.
Can you explain a little bit as to why you took this approach? I am just a learner so maybe I am missing something obvious.
No problem - glad you found it useful!
If we applied a fixed support then the nodes that make up the edge of the plate would not be able to move in any direction. We want these nodes to be able to slide along the line that we have added the boundary conditions to - so that the plate can change shape due to the applied load. If we applied a fixed support instead then the plate would not deform properly. Hope this makes sense?
Hi, really helpful video! I'm wondering if you could explain why you ignore the negative value given on the normal strain results. Do + and - not indicate the maximum compressive and tensile values? Thank you
Hi, the negative values indicate compressive stress/strain while the positive values are tensile. The reason I am ignoring them is that, if you take a look, you will see that the negative values are (at least) an order of magnitude smaller than the positive values. For example, at time 36:00 in the video, the max tensile stress is 3e7 Pa while the max compressive stress is -6.7e5 Pa. Hope this helps.
I attempting to generate the surface, but when using the create surface tool , only the center hole gets filled.
Hi, it's possible that the lines making the outer square are not joined together - there may be a small gap between them. Try checking this and see if it helps!
If I do this with symmetry on a thin plate in 3d I get the error: "one or more bodies may be underconstrained and experience rigid body motion. Weak springs have been added to attain a solution"
How do I fix this problem?
The error message is telling you that your model is underconstrained and is moving around in space. If you did this in 3D then I am guessing that you put the symmetry constraints in the x and y axis but you also need to put at least one constraint in the z-direction.
after generating mesh i click on static structural but my model goes back to 2d plane with no thickness, and the mesh disappear
Hi, that normally isn't a problem. If you click on mesh again then the mesh should be redisplayed. Sometimes workbench turns off the display of the mesh to make it easier for you to pick geometrical features when applying loads etc.
hello sir instead of using the number of division tool in sizing if directly change the size of all elements then what will be the difference in meshing in that way.
Hi. it's possible to get a good mesh, or even the same mesh, with both methods
I did exactly as you said and The Analysis is in 2D i get this message ( A solver pivot model warning or error has been detected in the UZ degree of freedom of node 3806 located in UNknown this is usually a result of an ill conditioned .....etc) can you help me?pls
Hi, that error message is basically saying to you that your model is unconstrained in the z-direction and can move as much as it wants in the z-direction. Clearly this is a 2D model and should only have degrees of freedom (DOF) in the x and y directions. I suspect what has happened is that you forgot the step early in the video where you set the analysis type to a 2D analysis!
@@LearnFiniteElementAnalysis thanks alot for your help actually it was because the file name should be in English and i was using German letters so that was the problem
Hello,Thank you for the video.
I'm trying to apply symmetry BC on a plate with an elleptical hole in the middle (the geometry I made is a forth of this plate) , it's a composite model so I did the ACP-pre work then imported it to Static structural to apply the load and the BC. However, as I clicked on the symmetry icon to apply symmetry regio, the symmetry region icon is not activated and I can only use the cyclic symmetry. What should I do and what should I do to be able to use the symmetry region option ? Thank you.
You are welcome!
I haven't done a lot of work with ACP recently so I don't remember all of the intricacies but two things come to mind: 1) are you sure that your geometry is defined on the xy plane and not another plane? 2) did you make sure to select a 2D analysis at the start? - if it is expecting a 3D analysis then it may be forcing the cyclic option.