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Transcript
00:00
In this video, you’ll
00:05
Modify simulation study general and mesh settings.
00:09
Determine when a linear static study is appropriate.
00:14
Remove rigid body modes.
00:17
Define appropriate element order.
00:20
Select analysis type (modal, stress, displacement).
00:26
Open the file Modifying a Static Stress Simulation Study.f3d,
00:31
and then activate the Simulation workspace.
00:35
While this setup is technically complete, it has a few issues that will prevent it from solving,
00:41
which now need to be identified and corrected.
00:46
From the Toolbar, Solve panel, select Solve.
00:51
The Solve dialog displays and lists the study.
00:55
If the study does not appear on the list,
00:58
expand the View Options drop-down and select Show Studies with Errors.
01:05
In the Status column, there is a warning next to the simulation study.
01:10
Click Repair, and Fusion 360 attempts to identify the error within the setup.
01:17
Another dialog displays, indicating it is Ready to Solve with Warnings.
01:23
As you can see, the solver has identified that there are
01:27
insufficient structural constraints in 'Load Case 1'.
01:32
This means that the structure is not fully constrained;
01:37
in other words, it is free to translate or rotate.
01:42
These are called rigid body modes, and are not acceptable for linear static studies.
01:48
One way to mitigate this is by using Remove rigid body modes,
01:53
which can be used when either the model is fully unconstrained
01:58
or, if the model is constrained, all loads acting in the constrained direction
02:03
are balanced AND the sum of the moments equal zero.
02:09
For now, close the dialog.
02:12
To correct this for now, you will edit the constraints.
02:16
In the Browser, under Study 1- Static Stress, expand Constraints.
02:22
Here, you can see that the structure is held by two pin constraints.
02:27
Right-click Pin 1, and, from the shortcut menu, click Edit Structural Constraint.
02:34
This displays the Structural Constraints dialog.
02:37
Immediately, you can see that this pin constraint is only restricting motion radially.
02:44
Side-to-side motion of the pin is prevented.
02:48
However, the constraint is not restricting motion axially or tangentially.
02:55
Keep the tangential rotation free so that it acts like a pin joint.
03:01
However, fix the axial motion so that the structure does not slide along its axis.
03:09
To do this, click the icon next to Axial to enable it, and then click OK.
03:17
Repeat the process for Pin2.
03:21
From the Browser, right-click Pin2 and select Edit Structural Constraint.
03:28
From the dialog, enable Axial, and then click OK.
03:34
Next, look at the mesh.
03:37
From the Browser, toggle ON visibility for Mesh.
03:42
The Mesh view dialog displays indicating that the mesh has not yet been computed.
03:48
To compute the mesh, click Yes.
03:51
A progress dialog displays as the mesh is generated.
03:56
With the mesh generated, zoom in on the model.
03:59
And you can see that the mesh looks very rough, but you can make it finer.
04:06
From the Browser, right-click Mesh
04:09
and select Mesh Settings to open the Mesh Settings dialog.
04:15
Under Average Element Size,
04:18
use the slider to reduce the Model-based Size of the mesh to about 3%.
04:26
Click Advanced Settings to open the options and inspect the current settings.
04:32
Here, the Element Order is set to 'Linear'.
04:35
This means that the elements in the mesh use 4 nodes.
04:41
This is quick to compute, but is not the most accurate.
04:46
Expand the Element Order drop-down and select Parabolic.
04:52
Parabolic uses 10 nodes, allowing for greater accuracy but at the cost of more computation time.
05:01
To improve the accuracy even more, enable Create Curved Mesh Elements .
05:08
Click OK to confirm the changes.
05:11
Now, regenerate the mesh.
05:14
From the Browser, right-click Mesh and select Generate Mesh.
05:19
Once the new mesh completes, it better conforms to the model.
05:24
Now you can solve the study again.s
05:27
From the Toolbar, Solve panel, select Solve.
05:32
In the Solve dialog, leave the settings the same as they were and simply click Solve.
05:38
The results display in the canvas.
05:41
From the Toolbar, click Finish Results.
05:45
Save the model.
Video transcript
00:00
In this video, you’ll
00:05
Modify simulation study general and mesh settings.
00:09
Determine when a linear static study is appropriate.
00:14
Remove rigid body modes.
00:17
Define appropriate element order.
00:20
Select analysis type (modal, stress, displacement).
00:26
Open the file Modifying a Static Stress Simulation Study.f3d,
00:31
and then activate the Simulation workspace.
00:35
While this setup is technically complete, it has a few issues that will prevent it from solving,
00:41
which now need to be identified and corrected.
00:46
From the Toolbar, Solve panel, select Solve.
00:51
The Solve dialog displays and lists the study.
00:55
If the study does not appear on the list,
00:58
expand the View Options drop-down and select Show Studies with Errors.
01:05
In the Status column, there is a warning next to the simulation study.
01:10
Click Repair, and Fusion 360 attempts to identify the error within the setup.
01:17
Another dialog displays, indicating it is Ready to Solve with Warnings.
01:23
As you can see, the solver has identified that there are
01:27
insufficient structural constraints in 'Load Case 1'.
01:32
This means that the structure is not fully constrained;
01:37
in other words, it is free to translate or rotate.
01:42
These are called rigid body modes, and are not acceptable for linear static studies.
01:48
One way to mitigate this is by using Remove rigid body modes,
01:53
which can be used when either the model is fully unconstrained
01:58
or, if the model is constrained, all loads acting in the constrained direction
02:03
are balanced AND the sum of the moments equal zero.
02:09
For now, close the dialog.
02:12
To correct this for now, you will edit the constraints.
02:16
In the Browser, under Study 1- Static Stress, expand Constraints.
02:22
Here, you can see that the structure is held by two pin constraints.
02:27
Right-click Pin 1, and, from the shortcut menu, click Edit Structural Constraint.
02:34
This displays the Structural Constraints dialog.
02:37
Immediately, you can see that this pin constraint is only restricting motion radially.
02:44
Side-to-side motion of the pin is prevented.
02:48
However, the constraint is not restricting motion axially or tangentially.
02:55
Keep the tangential rotation free so that it acts like a pin joint.
03:01
However, fix the axial motion so that the structure does not slide along its axis.
03:09
To do this, click the icon next to Axial to enable it, and then click OK.
03:17
Repeat the process for Pin2.
03:21
From the Browser, right-click Pin2 and select Edit Structural Constraint.
03:28
From the dialog, enable Axial, and then click OK.
03:34
Next, look at the mesh.
03:37
From the Browser, toggle ON visibility for Mesh.
03:42
The Mesh view dialog displays indicating that the mesh has not yet been computed.
03:48
To compute the mesh, click Yes.
03:51
A progress dialog displays as the mesh is generated.
03:56
With the mesh generated, zoom in on the model.
03:59
And you can see that the mesh looks very rough, but you can make it finer.
04:06
From the Browser, right-click Mesh
04:09
and select Mesh Settings to open the Mesh Settings dialog.
04:15
Under Average Element Size,
04:18
use the slider to reduce the Model-based Size of the mesh to about 3%.
04:26
Click Advanced Settings to open the options and inspect the current settings.
04:32
Here, the Element Order is set to 'Linear'.
04:35
This means that the elements in the mesh use 4 nodes.
04:41
This is quick to compute, but is not the most accurate.
04:46
Expand the Element Order drop-down and select Parabolic.
04:52
Parabolic uses 10 nodes, allowing for greater accuracy but at the cost of more computation time.
05:01
To improve the accuracy even more, enable Create Curved Mesh Elements .
05:08
Click OK to confirm the changes.
05:11
Now, regenerate the mesh.
05:14
From the Browser, right-click Mesh and select Generate Mesh.
05:19
Once the new mesh completes, it better conforms to the model.
05:24
Now you can solve the study again.s
05:27
From the Toolbar, Solve panel, select Solve.
05:32
In the Solve dialog, leave the settings the same as they were and simply click Solve.
05:38
The results display in the canvas.
05:41
From the Toolbar, click Finish Results.
05:45
Save the model.
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