analysis of a plate

[danielec1]

Hi, my name is daniele and I'm a mechanical engineering student.
I carried out an analysis on a circular plate subject to a distributed load at the center, I obtained and represented in mathlab the functions related to deformation and radial and tangential tension.
Now I should do a verification with a qls software, better if ansys.
How do I apply the load only on part of the surface?
Does it also make sense of the radial moment set out below?

Let me know!

 

[gerod]

If you have to apply only on one side you have to make a geometric trick. I do not use ansys professional but ds, so I think with the professional you can do quietly.
However, you create a small section variation or you could make the plate in the red zone of 10 mm thick (I set a number) and the grey one of 10,0001 thickness.
That's what they taught at ansys ds and I've always done that.
Hi.

 

[danielec1]

Okay, thanks for the advice! Can you tell me anything about the chart of the moment?
carrying out all the calculations, the various integrations and the calculation of the 6 constants I determined the functions of the shift and then the moments.
The deformation chart is consistent (so I think that the constants you find are right) while that of the moment seems almost to present a discontinuity. . .
Could it be right?

 

[danielec1]

thanks anyway for the help! :

 

[gerod]

Well, that it is discontinuous (at level) numerical is quite obvious. in reality the edge does not exist.
I can't say whether it's right or not! How do I do if I don't have the model, the loads, the constraints? ? ?
If you make available what you did and we can give you directions. so on two feet, without data, I don't know what to say.
Hi.

 

[danielec1]

You're right, I've been unclear!
the plate is framed and the uniform pressure distributed on the concentric circumference is about 2*10^8 pa.
I have done nothing but supplement the equations found on qls plate analysis book (belluzzi). I found 2 different functions for moving, one valid in the red circumference where I have the load, the other valid outside the red circumference where I have no force applied. therefore using the conditions given by the constraints and those of the continuity between the functions found, I calculated the 6 integration constants.

all this I did (and checked more than once) by hand without any computer.
I also compared the graphs obtained with other exercises and the graph of the movement is consistent, less that of the two moments.
This is the kind of cusp that seems strange to me... even because I am an expert in mechanical structures.
Thanks again for the availability!