- [Instructor] Now we're going to continue on
from the previous video.
We're going to set up loads and band conditions
and run the analysis.
This is for the mesh created from this surface body.
So want to right mouse click on fixtures and
choose fixed geometry,
and pick the left-hand edge here
and we need to choose advanced.
Reference geometry will be the front plane,
and I want to pick along direction one.
In other words, x, normal to the plane, in other words said.
I want to pick rotation about direction two, which is
rotation about the y-axis.
Check okay.
Right mouse , click on fixtures again.
Fixed geometry again.
This time I'm going to pick the corner vertex here
and choose advanced.
And I'm going to use front plane as my reference.
This time all I want to do is stop the trans-section on
direction two, which is the y direction.
Check okay.
This sets up a minimum constraint set to allow the
plate to stretch laterally when stretched.
In other words it can exhibit Poisson's ratio and we won't
have any singularities built in at the corners.
Right mouse click on external loads and choose force.
Pick the opposite end.
Now we choose the selected direction, again the reference
is going to be the front plane.
We choose direction one which is the x direction,
we're going to put in 1,000 pounds force.
Check okay.
We're going to rename this as horizontal.
I can right mouse click and copy, now I can paste back in.
We're going to rename this copy as vertical.
I'm going to edit the definition.
Now I want this to be a load in the normal sense.
In the zed direction.
I don't want the horizontal load anymore.
I'm going to make this 100 pounds force.
So it's gonna be a moment applied to my plate.
Check okay.
I want to run these one at a time.
So I am going to right mouse click on the vertical
and say suppress, then we can run the study.
We're looking at stress one, so let's go
to plot tools, probe.
They can move the elements in the middle.
And that will confirm the stress is 1,250 psi
which is correct.
Check okay.
Right mouse click on displacements
and double click to show.
And the values are effectively zero.
So the plate is responding as expected purely in plane.
Let's unsuppress the vertical loading and suppress the
horizontal loading and we'll run again.
This time with a bending load.
So right mouse click on stress one, let's edit the
definition and change this to stress in the x direction.
Notice we'll so have a top surface being represented
in the shell elements.
Check the pin, to keep visible, check okay.
Now if we look at the root stress values, it's around
33,990 psi and it's a compressive stress
at the top of plate, the root region.
This changes now to bottom, check okay.
Now the stress in the root region is
33,990 psi with intention.
So click x to exit.
Now there's one more way to look at the top and bottom
surfaces and the stresses on them directly.
So we can go to the stress again.
Go to chart options, under definition, go to advanced
options and render the shell thickness in 3-D.
So I can hold the pin there, check okay.
Now I have a visualization of the top stress,
the bottom stress.
We can see directly we got the 33,999 tension,
33,999 compression.
So when we come to settings, discrete doesn't seem
to be active here but we can come to mesh, click okay.
And then we get visualization mesh through thickness.
Now it isn't a 3-D mesh, it is still a 2-D mesh.
But it gives a simple indication of what's happening.
So it can be quite useful to see what's happening
top and bottom on a shell top structure.
You can see very clearly the compression the tension side.
We check out of that, come back to our normal view.
In summary, the plate seems to be responding accurately
to both axial and vertical loads.
Now we're going to contrast this in the next videos
with a plate mesh that we're going to create, using
solid geometry surfaces directly.
Where we'll put an offset into the element itself.
Let's save this off, save as, surface underscore plate
underscore end.
And we'll want to copy the results files.
So in the next video we'll continue
and we'll look at plate mesh created directly
from solid geometry surfaces.