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Transcript
00:09
In this unit, we will be reviewing the subcase results from the prior exercise.
00:17
So, we've set up two subcases, Subcase 1 with a gravity and a positive Z bearing load and Subcase 2 with gravity and a negative Z bearing load.
00:27
So, now I'm ready to solve this analysis and then compare the results.
00:30
So, I'll go ahead and select on "Run".
00:35
Now, I do recommend still performing a convergence analysis, so still doing mesh convergence for both subcases.
00:43
However, at this stage, we just want to make sure the results look correct and compare the magnitude for each one.
00:49
So, I'll select "Ok".
00:51
And I can now look at the results if again, if I'd like to clean things up,
00:54
I can go to the object visibility up here and I can turn off my loads, constraints,
00:60
maybe I turn off my unformed edges min max markers.
01:04
I could also turn off my mesh if I wanted to.
01:09
So, I can really see what's going on the part.
01:12
What I'll do next is compare the von mises stress for each subcase.
01:16
Now to do so you want to know which one you're looking at, if you go up to the top, you'll see Subcase 2 is the first one shown by default.
01:24
You'll also see on the left-hand side, the Von Mises icon here has a colored mesh next to it where the Subcase 1 does not.
01:32
So, up here, if I switch from Subcase 2 to Subcase 1, that now is going to show the results for Subcase 1.
01:40
So, I can compare the stresses I'm seeing for each.
01:43
Same goes with displacement.
01:45
If I switch to my displacement result with that load,
01:54
Subcase 1 is shown here again, up top here, I can switch from Subcase 1 to Subcase 2 and take a look at those results.
02:02
Another good thing to compare in the result sets is the magnitude of the reaction force.
02:08
So, if I go to one of the receiver constraints and I right click and I go to "Reactions",
02:14
it's going to load the reactions dialog box here for that Y direction constraint.
02:20
So, I should see here for Subcase 1.
02:22
If I activate it.
02:24
As it rotates, it's going to try to lift up in the Y direction, which means the magnitude of my reaction force will be negative Y.
02:32
If I switch to Subcase 2, it's the opposite.
02:35
So, as it's pushed in, so let's say that I were to decelerate the vehicle,
02:40
it would create a compressive load on this hitch and create a lifting motion in the Y direction.
02:46
So, a negative Y direction, which means the reaction force will be in the positive Y.
02:52
So, the magnitude and orientation of those reaction forces look correct.
02:56
So, I can go ahead and click on "Close".
02:59
So, the last thing that I'm going to compare between the two subcases is the amount of displacement at the end of the hitch.
03:05
Now, one quick way to do this is by creating XY plots for both subcase.
03:10
So, if I go to XY plot at the bottom of the tree and I right click and select "New", I can create a new plot.
03:16
I'll be using a node position.
03:19
And then for the entity to plot, I'm going to change this to a long-selected entity which lets me choose what I'd like to plot.
03:27
So, I'm going to choose this leading edge right here on the flat part of that hitch.
03:32
It will plot the position along that line on the X axis and then the displacement along the Y axis.
03:40
So, I'll select "Show" and this shows for Subcase 1,
03:44
the amount of displacement as I get further away from the beginning of that flat part, I should see the displacement increase.
03:51
And that's what I'm seeing here.
03:52
If I'd like to save this data, I can click "Copy Data to Clipboard" and I can actually paste it into an Excel spreadsheet.
03:60
And I can compare these side by side.
04:03
The other option is to take a screenshot and then just compare the two plots side by side.
04:07
I'll select, "Ok". And now what I'm going to do is plot Subcase 2.
04:11
So, I'll switch my subcase here to the second one, leaving the same edge, same result data and select "Show".
04:19
So, now it's going to show a new plot which should look similar,
04:22
but the magnitude of these values will be slightly different as it is under compression instead of tension.
04:28
So, again, I can take a screenshot or copy the data to a clipboard and move it into a spreadsheet click "Ok".
04:35
Close. And I can go ahead and save and continue with a mesh convergence study or probing for more detailed results.
Video transcript
00:09
In this unit, we will be reviewing the subcase results from the prior exercise.
00:17
So, we've set up two subcases, Subcase 1 with a gravity and a positive Z bearing load and Subcase 2 with gravity and a negative Z bearing load.
00:27
So, now I'm ready to solve this analysis and then compare the results.
00:30
So, I'll go ahead and select on "Run".
00:35
Now, I do recommend still performing a convergence analysis, so still doing mesh convergence for both subcases.
00:43
However, at this stage, we just want to make sure the results look correct and compare the magnitude for each one.
00:49
So, I'll select "Ok".
00:51
And I can now look at the results if again, if I'd like to clean things up,
00:54
I can go to the object visibility up here and I can turn off my loads, constraints,
00:60
maybe I turn off my unformed edges min max markers.
01:04
I could also turn off my mesh if I wanted to.
01:09
So, I can really see what's going on the part.
01:12
What I'll do next is compare the von mises stress for each subcase.
01:16
Now to do so you want to know which one you're looking at, if you go up to the top, you'll see Subcase 2 is the first one shown by default.
01:24
You'll also see on the left-hand side, the Von Mises icon here has a colored mesh next to it where the Subcase 1 does not.
01:32
So, up here, if I switch from Subcase 2 to Subcase 1, that now is going to show the results for Subcase 1.
01:40
So, I can compare the stresses I'm seeing for each.
01:43
Same goes with displacement.
01:45
If I switch to my displacement result with that load,
01:54
Subcase 1 is shown here again, up top here, I can switch from Subcase 1 to Subcase 2 and take a look at those results.
02:02
Another good thing to compare in the result sets is the magnitude of the reaction force.
02:08
So, if I go to one of the receiver constraints and I right click and I go to "Reactions",
02:14
it's going to load the reactions dialog box here for that Y direction constraint.
02:20
So, I should see here for Subcase 1.
02:22
If I activate it.
02:24
As it rotates, it's going to try to lift up in the Y direction, which means the magnitude of my reaction force will be negative Y.
02:32
If I switch to Subcase 2, it's the opposite.
02:35
So, as it's pushed in, so let's say that I were to decelerate the vehicle,
02:40
it would create a compressive load on this hitch and create a lifting motion in the Y direction.
02:46
So, a negative Y direction, which means the reaction force will be in the positive Y.
02:52
So, the magnitude and orientation of those reaction forces look correct.
02:56
So, I can go ahead and click on "Close".
02:59
So, the last thing that I'm going to compare between the two subcases is the amount of displacement at the end of the hitch.
03:05
Now, one quick way to do this is by creating XY plots for both subcase.
03:10
So, if I go to XY plot at the bottom of the tree and I right click and select "New", I can create a new plot.
03:16
I'll be using a node position.
03:19
And then for the entity to plot, I'm going to change this to a long-selected entity which lets me choose what I'd like to plot.
03:27
So, I'm going to choose this leading edge right here on the flat part of that hitch.
03:32
It will plot the position along that line on the X axis and then the displacement along the Y axis.
03:40
So, I'll select "Show" and this shows for Subcase 1,
03:44
the amount of displacement as I get further away from the beginning of that flat part, I should see the displacement increase.
03:51
And that's what I'm seeing here.
03:52
If I'd like to save this data, I can click "Copy Data to Clipboard" and I can actually paste it into an Excel spreadsheet.
03:60
And I can compare these side by side.
04:03
The other option is to take a screenshot and then just compare the two plots side by side.
04:07
I'll select, "Ok". And now what I'm going to do is plot Subcase 2.
04:11
So, I'll switch my subcase here to the second one, leaving the same edge, same result data and select "Show".
04:19
So, now it's going to show a new plot which should look similar,
04:22
but the magnitude of these values will be slightly different as it is under compression instead of tension.
04:28
So, again, I can take a screenshot or copy the data to a clipboard and move it into a spreadsheet click "Ok".
04:35
Close. And I can go ahead and save and continue with a mesh convergence study or probing for more detailed results.
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