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Any referenced datasets can be downloaded from "Module downloads" in the module overview.
Transcript
00:09
We will now go ahead and begin with the Inventor Nastran analysis using this simplified model.
00:16
So I'll go to the "Environments" tab where I will select "Autodesk Inventor Nastran" to load the environment.
00:25
Once open, you'll notice on the left-hand side, the Analysis Tree has automatically been populated.
00:31
You will see under "Idealizations", Solid 1 has been automatically created.
00:37
Expanding this Solid, you will see Generic has been assigned.
00:42
This is because a material was not defined in the part environment.
00:47
So what I'll do first is I'm going to edit Solid 1 by right clicking on the name and selecting "Edit".
00:56
Once this dialog box is open, I can then change the name as well as the material settings.
01:02
So I'll change the name to "Steel".
01:06
I will then click the icon next to the drop down menu for Material, where it says "New Material".
01:15
This opens up the Material dialog box where I can choose from the Autodesk Library by selecting "Select Material" at the top left.
01:25
In the Material Database options here, I will expand the Autodesk Material Library,
01:30
and I will scroll down to where it says "Alloy Steel".
01:35
Click on it and select, "Ok".
01:36
This will bring Alloy Steel into the Idealization and automatically load in the density,
01:42
Young's modulus, yield strength and tensile strength of the material.
01:46
I can then click, "Ok".
01:49
Notice the name, Coordinate System and Element type have remained the same.
01:53
I've now updated the Material to Alloy Steel, and I will then select "Ok" to confirm my changes.
01:60
And now in the Idealizations node, you'll see underneath Solids, Steel with an Alloy Steel material defined.
02:06
So that Idealization contains two things. One, the element type being used and two the material assigned to it.
02:13
Next to Mesh Model, you'll see this exclamation point.
02:17
What this means is that something has been changed and the mesh needs to be updated.
02:21
This will happen anytime you change an Idealization property, or you update the geometry in the original model.
02:29
So to generate the baseline mesh, I'm going to select "Generate Mesh" from the top ribbon on the Mesh panel,
02:38
this will generate a default mesh using a percentage of the model size.
02:43
We will refine the mesh with settings and parameters later on, but for now we'll use the basic mesh.
02:51
So now that I have my Materials and Idealizations confirmed, I can begin applying Constraints and Loads.
02:58
I'll start by applying constraints. In order to do that, I will select "Constraints" from the top ribbon.
03:05
From the dialog box,
03:06
I will then choose a Face or an Edge to apply the Constraint to, as well as what Degrees of Freedom are available.
03:14
I'll start by fixing the base of this plate as it will be welded to a larger structure.
03:20
In order to do that, I'm going to rotate my model and then select the bottom face of the plate.
03:28
It will then show up in the Selected Entities box as Face ID number 29.
03:33
For the name, I'm going to rename this constraint "Fixed",
03:37
so that I know what type of constraint it is just by glancing at the Subcase tree.
03:45
I will then click the Glasses" button at the very bottom to preview the location of the constraint,
03:51
which will show the icon at the center of that face.
03:55
Notice the X, Y and Z translation directions and the Rx, Ry, Rz rotation Degrees of Freedom are all checked,
04:03
meaning they are all constrained.
04:06
And I'll then select, "Ok".
04:09
Constraint Fixed has been added to the Constraints node in the Subcase.
04:14
And now I can continue adding additional constraints.
04:18
So the next constraint I will add will represent the symmetry along the symmetry plane we created earlier.
04:26
Symmetry is added to any face that was affected by the symmetry plane along the split line,
04:32
which in this case was the XZ plane, which means the symmetry direction is normal to that plane.
04:39
The symmetry direction in this case will be the Y direction.
04:43
In order to apply that constraint, I will once again activate "Constraints", this time selecting the side face where it was split,
04:52
that is chosen as face ID number 33.
04:56
I can then change the name of my Constraint to "Symmetry Y",
05:02
since it's symmetric in the Y direction.
05:06
Then down near the bottom right where you see Symmetry, I'm going to go ahead and select the "Y" button,
05:14
which will automatically apply Y symmetry conditions,
05:16
which are translation in the Y direction normal to the plane as well as rotation through that plane,
05:23
which is the rotation about the X axis as well as rotation about the Z axis.
05:29
Once again to preview that location, I can click the "Glasses" button to preview that constraint location,
05:35
and then select "Ok" to confirm.
05:40
Now that I have fully constrained the model, I can go ahead and begin adding my load conditions.
05:45
In this case, we will be adding a bearing load,
05:48
which will represent the pull of the sheave cable on this individual bolt hole here.
05:56
In order to do that, I will choose the Loads button from the ribbon.
06:01
From this dialog box, I can then choose the face on which this load will be acting as well as the type and magnitude.
06:09
I will choose the face shown here, Face ID number 21.
06:14
I will then change the type of my load from Force to a Bearing Load.
06:19
Since this load will only be acting in a compressive direction due to the bolt running through the center of that face.
06:27
Once Bearing Load has been activated, I can then give the same name,
06:31
which I will name Sheave 5000 lbf.
06:40
So it's the load coming from the Sheave with a magnitude of 5000 lbf, which I will then apply using the Magnitude options here.
06:51
In this case, the load is going to be acting in the horizontal direction,
06:55
which according to this coordinate system is the X direction.
06:59
In order to apply a load that direction, I will choose the Fx box and I will type in 5000 lbf.
07:07
Prior to confirming, I'm going to activate the glasses button along the bottom and confirm the load direction.
07:15
Notice the load arrows are facing to the right in this visual.
07:20
Where in reality, the load should be pulling to the left in order to change or reverse the load direction,
07:27
I can just type in a minus sign in front of 5000,
07:31
which will then flip the load to act in the negative X direction, which is the orientation of that Sheave.
07:40
I will then confirm by selecting "Ok".
07:43
And notice now in the Subcase 1,
07:45
I have a 5000 lbf load from the Sheave as well as a Fixed constraint and a Y Symmetry constraint.
Video transcript
00:09
We will now go ahead and begin with the Inventor Nastran analysis using this simplified model.
00:16
So I'll go to the "Environments" tab where I will select "Autodesk Inventor Nastran" to load the environment.
00:25
Once open, you'll notice on the left-hand side, the Analysis Tree has automatically been populated.
00:31
You will see under "Idealizations", Solid 1 has been automatically created.
00:37
Expanding this Solid, you will see Generic has been assigned.
00:42
This is because a material was not defined in the part environment.
00:47
So what I'll do first is I'm going to edit Solid 1 by right clicking on the name and selecting "Edit".
00:56
Once this dialog box is open, I can then change the name as well as the material settings.
01:02
So I'll change the name to "Steel".
01:06
I will then click the icon next to the drop down menu for Material, where it says "New Material".
01:15
This opens up the Material dialog box where I can choose from the Autodesk Library by selecting "Select Material" at the top left.
01:25
In the Material Database options here, I will expand the Autodesk Material Library,
01:30
and I will scroll down to where it says "Alloy Steel".
01:35
Click on it and select, "Ok".
01:36
This will bring Alloy Steel into the Idealization and automatically load in the density,
01:42
Young's modulus, yield strength and tensile strength of the material.
01:46
I can then click, "Ok".
01:49
Notice the name, Coordinate System and Element type have remained the same.
01:53
I've now updated the Material to Alloy Steel, and I will then select "Ok" to confirm my changes.
01:60
And now in the Idealizations node, you'll see underneath Solids, Steel with an Alloy Steel material defined.
02:06
So that Idealization contains two things. One, the element type being used and two the material assigned to it.
02:13
Next to Mesh Model, you'll see this exclamation point.
02:17
What this means is that something has been changed and the mesh needs to be updated.
02:21
This will happen anytime you change an Idealization property, or you update the geometry in the original model.
02:29
So to generate the baseline mesh, I'm going to select "Generate Mesh" from the top ribbon on the Mesh panel,
02:38
this will generate a default mesh using a percentage of the model size.
02:43
We will refine the mesh with settings and parameters later on, but for now we'll use the basic mesh.
02:51
So now that I have my Materials and Idealizations confirmed, I can begin applying Constraints and Loads.
02:58
I'll start by applying constraints. In order to do that, I will select "Constraints" from the top ribbon.
03:05
From the dialog box,
03:06
I will then choose a Face or an Edge to apply the Constraint to, as well as what Degrees of Freedom are available.
03:14
I'll start by fixing the base of this plate as it will be welded to a larger structure.
03:20
In order to do that, I'm going to rotate my model and then select the bottom face of the plate.
03:28
It will then show up in the Selected Entities box as Face ID number 29.
03:33
For the name, I'm going to rename this constraint "Fixed",
03:37
so that I know what type of constraint it is just by glancing at the Subcase tree.
03:45
I will then click the Glasses" button at the very bottom to preview the location of the constraint,
03:51
which will show the icon at the center of that face.
03:55
Notice the X, Y and Z translation directions and the Rx, Ry, Rz rotation Degrees of Freedom are all checked,
04:03
meaning they are all constrained.
04:06
And I'll then select, "Ok".
04:09
Constraint Fixed has been added to the Constraints node in the Subcase.
04:14
And now I can continue adding additional constraints.
04:18
So the next constraint I will add will represent the symmetry along the symmetry plane we created earlier.
04:26
Symmetry is added to any face that was affected by the symmetry plane along the split line,
04:32
which in this case was the XZ plane, which means the symmetry direction is normal to that plane.
04:39
The symmetry direction in this case will be the Y direction.
04:43
In order to apply that constraint, I will once again activate "Constraints", this time selecting the side face where it was split,
04:52
that is chosen as face ID number 33.
04:56
I can then change the name of my Constraint to "Symmetry Y",
05:02
since it's symmetric in the Y direction.
05:06
Then down near the bottom right where you see Symmetry, I'm going to go ahead and select the "Y" button,
05:14
which will automatically apply Y symmetry conditions,
05:16
which are translation in the Y direction normal to the plane as well as rotation through that plane,
05:23
which is the rotation about the X axis as well as rotation about the Z axis.
05:29
Once again to preview that location, I can click the "Glasses" button to preview that constraint location,
05:35
and then select "Ok" to confirm.
05:40
Now that I have fully constrained the model, I can go ahead and begin adding my load conditions.
05:45
In this case, we will be adding a bearing load,
05:48
which will represent the pull of the sheave cable on this individual bolt hole here.
05:56
In order to do that, I will choose the Loads button from the ribbon.
06:01
From this dialog box, I can then choose the face on which this load will be acting as well as the type and magnitude.
06:09
I will choose the face shown here, Face ID number 21.
06:14
I will then change the type of my load from Force to a Bearing Load.
06:19
Since this load will only be acting in a compressive direction due to the bolt running through the center of that face.
06:27
Once Bearing Load has been activated, I can then give the same name,
06:31
which I will name Sheave 5000 lbf.
06:40
So it's the load coming from the Sheave with a magnitude of 5000 lbf, which I will then apply using the Magnitude options here.
06:51
In this case, the load is going to be acting in the horizontal direction,
06:55
which according to this coordinate system is the X direction.
06:59
In order to apply a load that direction, I will choose the Fx box and I will type in 5000 lbf.
07:07
Prior to confirming, I'm going to activate the glasses button along the bottom and confirm the load direction.
07:15
Notice the load arrows are facing to the right in this visual.
07:20
Where in reality, the load should be pulling to the left in order to change or reverse the load direction,
07:27
I can just type in a minus sign in front of 5000,
07:31
which will then flip the load to act in the negative X direction, which is the orientation of that Sheave.
07:40
I will then confirm by selecting "Ok".
07:43
And notice now in the Subcase 1,
07:45
I have a 5000 lbf load from the Sheave as well as a Fixed constraint and a Y Symmetry constraint.
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