## One Badge

1 years, 206 days

## @Rouben Rostamian   Dear Rouben T...

Dear Rouben

Thanks so much for your help.

Best Regards

## This equation is a general form of ......

Thanks. This equation is a general form of elasticity problem and may be used as 1,2 or 3D in plate and shell problems.

Could you please introduce me a refrence for finding procedure to calculate weak form of these terms?

Best

## I found this document at ......

Thanks, Rouben.

I found this document at

https://math.stackexchange.com/questions/2091901/how-to-derive-weak-form-of-the-poissons-equation

Please see it. My equation is similar to that, but my equation only has additional terms

.and

I need to apply the same procedure mentioned on that site on these additional terms.

Could you help me with how I can do the same task these terms?

This equation used in the elasticity problem and considering it as 3D lead to accurate results. This is the reason for using 3D.

Thanks for sharing the paper. The content of the paper was difficult for me because my field is not exactly mathematics, I am an engineering student.

Best

## dimension of the space variable is three...

Thanks so much, Rouben,

dimension of the space variable is three. In such case please update your comments.

will we want triangular elements again?

## check my calculations?...

Thanks.

Could you please check my calculations?

I provided them in the new maple file in attachments.

Best.

55555.mw

## How I can change three conditions.......

Thanks. How I can change three conditions to have 5  Eigenvectors that I mentioned their conditions and format in my main question?

Thanks

## can anyone help me.......

can anyone help me or if other information needed let me know.

## Could you please send me your calculatio...

@vv Could you please send me your calculation?

I think they are correct!!!

Thanks

## For the Jordan form.......

Thanks so much.

For the Jordan form how I can find those eigenvectors?

## plot new fuction...

Thanks so much. How I can plot

by having W[r]

functions.

I do not know how I can extract the solutions of xi[r] (r=1..6).

Thanks for helping me.

Best

displacement.mw

## @tomleslie  Thanks. what is the pr...

Thanks. what is the problem in new equations?

I want to repeat the same procedure for functions z1,z3,z5,z7,z9,z11 and plot the results.

Best

FIG_11_PLOT2.mw

## plot Phase portrait?...

Thanks so much,

How I can Plot Phase portrait {differential of xi[j] (t)  i.e.,
[diff(xi[j](t),t)] versus xi[j] (t)}?

## for case R<0...

Thanks. for case R<0, there is a problem!!

## I want to plot through using......

I saw that link. but I want to plot through using relation

in cylinderical coordinate and then change input data to create different shape.

Best

## not work...

This site not work for me!!!

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