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Any referenced datasets can be downloaded from "Module downloads" in the module overview.
Transcript
00:09
So for this exercise, we're working with this cable sheave part file once again.
00:14
You will notice that it has already been set up from the previous exercises.
00:18
So the boundary conditions, so your Loads and your Constraints,
00:22
as well as the Solid Element Idealization with a material and then a mesh has already been defined.
00:29
So at this stage, this analysis is ready to run.
00:33
So I will select "Run" from the "Solve" panel on the ribbon.
00:37
This will kick off the Inventor Nastran Solver.
00:41
When it's finished, you should get a window that comes up and says Nastran Solution Complete.
00:46
If you are missing a Constraint or a Load or there's some type of instability in the model,
00:52
you may get a Nastran Solution Failed window.
00:55
In this case, we know that this is set up properly.
00:58
So we'll select "Ok" to view the results.
01:01
So the first result that's going to show up is your Stress.
01:04
This is going to be your SOLID VON MISES STRESS by default.
01:08
You will notice, it shows you the legend on the left hand side here.
01:13
And if you'd like to change the type of result being shown, you can simply use these drop down menus right here.
01:18
You have your type, your subtype and then the units.
01:22
So if I change the type to Displacement, it'll show my total displacement in inches.
01:29
And then from here, I can also add in things like animation.
01:33
So at the top where you see the Results panel, there's an option to Animate. If I select "Animate",
01:40
it's going to take this Displacement result along with the deformed model, and it will animate the result in 3D.
01:48
So it shows the load being applied with an exaggerated deformation to show the path that that load would take,
01:54
and the resulting displacement.
01:57
When you're done with animating, you can click "Animate" again to turn it off.
02:02
So now I'm going to take a look at another way that you can visualize your results.
02:06
We've already seen Stress and Displacement plotted as three dimensional contours on our CAD model.
02:13
The other way you can pull results is using the XY Plot function.
02:17
This is going to give you the actual exact values versus their position and their coordinates.
02:25
So for instance, I can right-click on "XY Plot" at the bottom of my browser and select "New".
02:31
This will open up the XY Plot dialog box.
02:34
This is where I can choose Nodal results or Elemental results to plot.
02:39
My nodal results are going to be things like displacement and reaction force.
02:43
Elemental results would be your normal principle or von mises stresses that would be added to your Y-Axis.
02:50
So if I want to plot, for instance, the displacement of each node along a given area or line,
02:59
instead of choosing individual nodes in their positions, I can check the box for Along Selected Entity.
03:06
And I can actually choose this line right here, this vertical edge of my flange.
03:12
And then I can choose on the right hand side here,
03:16
the type of data I'd like to plot, which is going to be Displacement in this case.
03:20
The resulting plot will show the position of each node relative to the origin or its distance away from the origin.
03:29
And then it's going to plot the displacement of each on the Y-Axis.
03:33
So if I click "Show XY Plot", you'll see the Displacement versus Distance from the origin,
03:39
in inches, you'll see that magnitude increase as we get further away from the origin at the bottom of the part.
03:46
So as we go up this line, as we get closer to that load, and this flange bends more,
03:52
we should see that displacement increase along that edge. And that's exactly what the plot is showing.
03:57
What's great about this plot is if you hover over each individual data point,
04:02
it'll give you the actual true value of the displacement and the position.
04:07
If I'd like to save this for future use, I can click, "Ok".
04:11
I can give this a name. So in this case, we'll call it Displacement.
04:15
And then I can click "Save" at the bottom of my window here and it will save it.
04:19
So I'll click "Close" and you'll see it saved under XY Plot as Displacement.
04:24
This is really helpful because I can go back at any point,
04:27
and double click on that plot and it will open up that plot and I can then pull the data again.
04:36
Now, in the next exercise, we will discuss the mesh and making refinements in more detail.
04:41
But it should be noted that if you would like to reduce or change the mesh size in any ways,
04:47
and then rerun the analysis that can be done very quickly.
04:51
If you select "Mesh Settings" from the Mesh panel up top, you'll notice the Element Size here is chosen as 0.787679.
04:59
Your value may be slightly different.
05:01
This value is based off of a percentage of the overall bounding box of the model and it is automatically calculated by the solver.
05:09
If I would like to manually type in a value, I can do so.
05:12
So let's say, I choose roughly half of this. Let's do 0.375 inches.
05:19
And then I select "Generate". This will regenerate the mesh.
05:23
Now the old results at this point are no longer valid because they cannot be mapped to the nodes and elements now displayed.
05:30
So if I select "Ok", and then I click "Run" again, I can regenerate the results for the new mesh.
05:36
Now, there are more nodes and more elements that have been created.
05:40
So this should take slightly longer to solve. But I'll go ahead and select "Run" once again.
05:45
And this is the iterative process that you will typically use when you're performing an FEA,
05:50
in order to determine how sensitive your result is to the mesh size.
05:56
So when the solution is complete, once again, I'll select "Ok" to view the results.
06:01
And I now should see a slightly different result for my Stress. Your Stress will have increased.
06:08
So double check your value for Stress. It should be larger than the prior exercise.
06:13
It may not match mine exactly depending on the version of Inventor Nastran that you're using.
06:19
If you look at Displacement, that value should have also changed, it may have increased, it may have decreased,
06:25
but it should be more accurate.
06:26
Now that we have more elements in the model, capturing that load and capturing the stiffness of the model.
Video transcript
00:09
So for this exercise, we're working with this cable sheave part file once again.
00:14
You will notice that it has already been set up from the previous exercises.
00:18
So the boundary conditions, so your Loads and your Constraints,
00:22
as well as the Solid Element Idealization with a material and then a mesh has already been defined.
00:29
So at this stage, this analysis is ready to run.
00:33
So I will select "Run" from the "Solve" panel on the ribbon.
00:37
This will kick off the Inventor Nastran Solver.
00:41
When it's finished, you should get a window that comes up and says Nastran Solution Complete.
00:46
If you are missing a Constraint or a Load or there's some type of instability in the model,
00:52
you may get a Nastran Solution Failed window.
00:55
In this case, we know that this is set up properly.
00:58
So we'll select "Ok" to view the results.
01:01
So the first result that's going to show up is your Stress.
01:04
This is going to be your SOLID VON MISES STRESS by default.
01:08
You will notice, it shows you the legend on the left hand side here.
01:13
And if you'd like to change the type of result being shown, you can simply use these drop down menus right here.
01:18
You have your type, your subtype and then the units.
01:22
So if I change the type to Displacement, it'll show my total displacement in inches.
01:29
And then from here, I can also add in things like animation.
01:33
So at the top where you see the Results panel, there's an option to Animate. If I select "Animate",
01:40
it's going to take this Displacement result along with the deformed model, and it will animate the result in 3D.
01:48
So it shows the load being applied with an exaggerated deformation to show the path that that load would take,
01:54
and the resulting displacement.
01:57
When you're done with animating, you can click "Animate" again to turn it off.
02:02
So now I'm going to take a look at another way that you can visualize your results.
02:06
We've already seen Stress and Displacement plotted as three dimensional contours on our CAD model.
02:13
The other way you can pull results is using the XY Plot function.
02:17
This is going to give you the actual exact values versus their position and their coordinates.
02:25
So for instance, I can right-click on "XY Plot" at the bottom of my browser and select "New".
02:31
This will open up the XY Plot dialog box.
02:34
This is where I can choose Nodal results or Elemental results to plot.
02:39
My nodal results are going to be things like displacement and reaction force.
02:43
Elemental results would be your normal principle or von mises stresses that would be added to your Y-Axis.
02:50
So if I want to plot, for instance, the displacement of each node along a given area or line,
02:59
instead of choosing individual nodes in their positions, I can check the box for Along Selected Entity.
03:06
And I can actually choose this line right here, this vertical edge of my flange.
03:12
And then I can choose on the right hand side here,
03:16
the type of data I'd like to plot, which is going to be Displacement in this case.
03:20
The resulting plot will show the position of each node relative to the origin or its distance away from the origin.
03:29
And then it's going to plot the displacement of each on the Y-Axis.
03:33
So if I click "Show XY Plot", you'll see the Displacement versus Distance from the origin,
03:39
in inches, you'll see that magnitude increase as we get further away from the origin at the bottom of the part.
03:46
So as we go up this line, as we get closer to that load, and this flange bends more,
03:52
we should see that displacement increase along that edge. And that's exactly what the plot is showing.
03:57
What's great about this plot is if you hover over each individual data point,
04:02
it'll give you the actual true value of the displacement and the position.
04:07
If I'd like to save this for future use, I can click, "Ok".
04:11
I can give this a name. So in this case, we'll call it Displacement.
04:15
And then I can click "Save" at the bottom of my window here and it will save it.
04:19
So I'll click "Close" and you'll see it saved under XY Plot as Displacement.
04:24
This is really helpful because I can go back at any point,
04:27
and double click on that plot and it will open up that plot and I can then pull the data again.
04:36
Now, in the next exercise, we will discuss the mesh and making refinements in more detail.
04:41
But it should be noted that if you would like to reduce or change the mesh size in any ways,
04:47
and then rerun the analysis that can be done very quickly.
04:51
If you select "Mesh Settings" from the Mesh panel up top, you'll notice the Element Size here is chosen as 0.787679.
04:59
Your value may be slightly different.
05:01
This value is based off of a percentage of the overall bounding box of the model and it is automatically calculated by the solver.
05:09
If I would like to manually type in a value, I can do so.
05:12
So let's say, I choose roughly half of this. Let's do 0.375 inches.
05:19
And then I select "Generate". This will regenerate the mesh.
05:23
Now the old results at this point are no longer valid because they cannot be mapped to the nodes and elements now displayed.
05:30
So if I select "Ok", and then I click "Run" again, I can regenerate the results for the new mesh.
05:36
Now, there are more nodes and more elements that have been created.
05:40
So this should take slightly longer to solve. But I'll go ahead and select "Run" once again.
05:45
And this is the iterative process that you will typically use when you're performing an FEA,
05:50
in order to determine how sensitive your result is to the mesh size.
05:56
So when the solution is complete, once again, I'll select "Ok" to view the results.
06:01
And I now should see a slightly different result for my Stress. Your Stress will have increased.
06:08
So double check your value for Stress. It should be larger than the prior exercise.
06:13
It may not match mine exactly depending on the version of Inventor Nastran that you're using.
06:19
If you look at Displacement, that value should have also changed, it may have increased, it may have decreased,
06:25
but it should be more accurate.
06:26
Now that we have more elements in the model, capturing that load and capturing the stiffness of the model.
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