Set up and run structural buckling simulations and review the results.
Transcript
00:06
In this video we will discuss structural buckling.
00:09
You may be wondering what buckling is and why simulate it during the design phase?
00:17
The technical explanation
00:19
is when an object is very long in comparison to its cross-sectional area
00:23
and becomes unstable under a compressive load.
00:27
You've probably seen this in plastic furniture
00:29
or standing on something that wasn't intended to hold the weight of a person.
00:33
The instability can end in a catastrophic failure,
00:36
which personally I'd rather see on a computer.
00:39
So, let's avoid buckling early on.
00:44
We are provided with a buckling load factor,
00:47
which multiplied by the load will cause buckling.
00:50
A value of less than one means that buckling will occur with the current load.
00:55
Typically, we look for the lowest buckling load factor from the different modes.
01:01
Let me show you how to set up and run a Structural Buckling study.
01:09
We bring our geometry into the Simulation workspace.
01:15
Select Structural Buckling as the study type in the New Study dialog.
01:20
At this time, we can access the Study Settings
01:23
and set the number of vibration modes.
01:26
The displaced shape from buckling is based on vibration modes.
01:29
The default of three is typically enough.
01:32
We can also adjust our mesh settings.
01:40
Now we can modify our materials
01:42
if they weren't assigned in the Modeling (Design) space.
01:55
We can assign constraints to keep the model from moving infinitely.
02:01
Fixing the bottom of the four legs is like if it were sitting in grass
02:04
and the legs couldn't slide like they might on a slippery floor.
02:14
Assign our loads.
02:16
This can be determined by design criteria, or we could use a value of 1.
02:25
The advantage of using 1 is that the load factor reported back to us
02:29
will be the force required to cause buckling.
02:33
We assign contacts that are appropriate for our model.
02:36
In this case the legs are coincident to the table,
02:39
and we can use the Automatic Contact Generator to create bonded contacts.
02:43
Now we can solve our analysis in the cloud.
02:56
Once the analysis is finished
02:58
we have the same results mentioned previously for the different buckling modes.
03:02
Since we used the load of 1
03:04
the buckling load factor is the force required to cause structural buckling.
03:09
For this setup, about 195 pounds.
03:23
I hope this helps, happy simulating.
00:06
In this video we will discuss structural buckling.
00:09
You may be wondering what buckling is and why simulate it during the design phase?
00:17
The technical explanation
00:19
is when an object is very long in comparison to its cross-sectional area
00:23
and becomes unstable under a compressive load.
00:27
You've probably seen this in plastic furniture
00:29
or standing on something that wasn't intended to hold the weight of a person.
00:33
The instability can end in a catastrophic failure,
00:36
which personally I'd rather see on a computer.
00:39
So, let's avoid buckling early on.
00:44
We are provided with a buckling load factor,
00:47
which multiplied by the load will cause buckling.
00:50
A value of less than one means that buckling will occur with the current load.
00:55
Typically, we look for the lowest buckling load factor from the different modes.
01:01
Let me show you how to set up and run a Structural Buckling study.
01:09
We bring our geometry into the Simulation workspace.
01:15
Select Structural Buckling as the study type in the New Study dialog.
01:20
At this time, we can access the Study Settings
01:23
and set the number of vibration modes.
01:26
The displaced shape from buckling is based on vibration modes.
01:29
The default of three is typically enough.
01:32
We can also adjust our mesh settings.
01:40
Now we can modify our materials
01:42
if they weren't assigned in the Modeling (Design) space.
01:55
We can assign constraints to keep the model from moving infinitely.
02:01
Fixing the bottom of the four legs is like if it were sitting in grass
02:04
and the legs couldn't slide like they might on a slippery floor.
02:14
Assign our loads.
02:16
This can be determined by design criteria, or we could use a value of 1.
02:25
The advantage of using 1 is that the load factor reported back to us
02:29
will be the force required to cause buckling.
02:33
We assign contacts that are appropriate for our model.
02:36
In this case the legs are coincident to the table,
02:39
and we can use the Automatic Contact Generator to create bonded contacts.
02:43
Now we can solve our analysis in the cloud.
02:56
Once the analysis is finished
02:58
we have the same results mentioned previously for the different buckling modes.
03:02
Since we used the load of 1
03:04
the buckling load factor is the force required to cause structural buckling.
03:09
For this setup, about 195 pounds.
03:23
I hope this helps, happy simulating.
Want to try this? In the Fusion Data Panel, open the start file from Samples > Basic Training > 11 - Simulation > Plastic Table.
For more, see Structural buckling analysis.
