The film itself is useful, however you definitely overconstrained the model. Both static and buckling analyses show that the model has tendency to move ends of the legs outside which is prohibited artificially. In fact, for such a model a classic 3-2-1 constrain method should be used. It means only one leg end should have no translations (as shown in the film), three other leg ends should have only vertical (global Y) translations constrained. Additionally, global rotation around Y axis should be constrained (there are several methods to do it). In such a case model deformation will be more natural and results could be quite different.
The other question, I already read your overview about buckling analysis in your website. You write that “we have the Buckling Factor of Safety, we can compare it between Factors of Safety from a Static study result”. Why we should compare it between Factor of Safety in Static study? Or we just compare the BFS into BFS standar value, which is BFS > Buckling not predictable, etc.
Comparing the Buckling SF to the Static SF quick way to assess whether a design will exhibit a buckling failure or a yield failure first. However, there are often other considerations to take into account such as a buckling failure can often be catastrophic whereas a yield failure can be safe. I'm not sure that the author mentions this nuance in this presentation.
Why didn't you just click and apply normal force in the beginning? Why to complicate it with 'selected direction' even though its essentially the same thing no?
Hey Supun, Thanks for watching our video! In this case it allows more movement. The Remote Load/Displacement fixes just a single point, and the entire face of the stool can rotate around that fixed point. For this buckling example, the restraints are 'looser' allowing buckling to happen earlier. We tend to want to get results for the worst case scenario, and this helps us get there. Hope that helps! Regards, Shivani Patel - GoEngineer
@@divyanshprakash9374 Hey Divyansh, Thanks for watching our video! In this case it allows more movement. The Remote Load/Displacement fixes just a single point, and the entire face of the stool can rotate around that fixed point. For this buckling example, the restraints are 'looser' allowing buckling to happen earlier. We tend to want to get results for the worst case scenario, and this helps us get there. Hope that helps! Regards, Shivani Patel - GoEngineer
The legs bottom faces do not have geometry features (vertexes) you can use to restrict them normal way, so he used displacement restriction for the faces and coordinate systems features. You can use normal restrictions but you have to create artificial geometry with vertexes on the legs bottom face so you can select the vertex and restrict the bottom face (legs can rotate around the vertex).
Thank you for this information. But In I can’t change the buckling mode in my solidworks simulation. I only use the mode 1. But in my case, I wanna compare the mode 1,2,3 and 4 to know the best fixture that I gonna use. Can you help me for this case?
You can adjust the numbers of modes that are you solving for in the STUDY PROPERTIES. Right-click the study name in the Analysis tree, and then select "Properties". It is often useful to view multiple modes since the first few modes can often be cosmetic and non-structural modes (think of a file cabinet frame with thin sheet metal attached; the sheet metal tends to show buckling before the important structural frame).
The film itself is useful, however you definitely overconstrained the model. Both static and buckling analyses show that the model has tendency to move ends of the legs outside which is prohibited artificially. In fact, for such a model a classic 3-2-1 constrain method should be used. It means only one leg end should have no translations (as shown in the film), three other leg ends should have only vertical (global Y) translations constrained. Additionally, global rotation around Y axis should be constrained (there are several methods to do it). In such a case model deformation will be more natural and results could be quite different.
If the chair legs are mounted in the holes in the floor they will not slide.
A very useful video. Thank you for all the small tips and tricks.
Good! Very useful! Thank you!
Muito bom. Eu estava procurando um vídeo que me ensinasse sobre isso. Muito obrigado
The other question, I already read your overview about buckling analysis in your website.
You write that “we have the Buckling Factor of Safety, we can compare it between Factors of Safety from a Static study result”.
Why we should compare it between Factor of Safety in Static study?
Or we just compare the BFS into BFS standar value, which is BFS > Buckling not predictable, etc.
Comparing the Buckling SF to the Static SF quick way to assess whether a design will exhibit a buckling failure or a yield failure first.
However, there are often other considerations to take into account such as a buckling failure can often be catastrophic whereas a yield failure can be safe. I'm not sure that the author mentions this nuance in this presentation.
Thnx for another upload!
We appreciate you watching.
Why didn't you just click and apply normal force in the beginning? Why to complicate it with 'selected direction' even though its essentially the same thing no?
Informative vdo but it will be good for us if you can explain the modeling in brief along with simulation.
Can you show us simulation on robotic. Stress analysis on robotic fingers.
what is the different using Remote load and limit the displacement instead of fixed geometry as we normally do.
I also have the same question..
Hey Supun,
Thanks for watching our video! In this case it allows more movement. The Remote Load/Displacement fixes just a single point, and the entire face of the stool can rotate around that fixed point. For this buckling example, the restraints are 'looser' allowing buckling to happen earlier. We tend to want to get results for the worst case scenario, and this helps us get there. Hope that helps!
Regards,
Shivani Patel - GoEngineer
@@divyanshprakash9374
Hey Divyansh,
Thanks for watching our video! In this case it allows more movement. The Remote Load/Displacement fixes just a single point, and the entire face of the stool can rotate around that fixed point. For this buckling example, the restraints are 'looser' allowing buckling to happen earlier. We tend to want to get results for the worst case scenario, and this helps us get there. Hope that helps!
Regards,
Shivani Patel - GoEngineer
Thank you Miss. Patel. Now it is clear to me.
The legs bottom faces do not have geometry features (vertexes) you can use to restrict them normal way, so he used displacement restriction for the faces and coordinate systems features. You can use normal restrictions but you have to create artificial geometry with vertexes on the legs bottom face so you can select the vertex and restrict the bottom face (legs can rotate around the vertex).
Thank you for this information.
But In I can’t change the buckling mode in my solidworks simulation. I only use the mode 1.
But in my case, I wanna compare the mode 1,2,3 and 4 to know the best fixture that I gonna use.
Can you help me for this case?
You can adjust the numbers of modes that are you solving for in the STUDY PROPERTIES. Right-click the study name in the Analysis tree, and then select "Properties". It is often useful to view multiple modes since the first few modes can often be cosmetic and non-structural modes (think of a file cabinet frame with thin sheet metal attached; the sheet metal tends to show buckling before the important structural frame).