help ansys

[rmo]

someone who can help me with a problem to do with ansys apdl concerning a beam simply supported was tension plan.

 

[volaff]

Didn't you try to do something first? !
among other things on youtube find a lot of examples... .

 

[rmo]

Didn't you try to do something first? Yes I have a lot of doubts. I would need help above all with regard to the analysis of convergence and the shift for which I get great mistakes regarding the analytical solution of the maximum shift in half-car.

 

[rmo]

Didn't you try to do something first? !
among other things on youtube find a lot of examples... .

on the internet there are several real examples but there are no convergence analyses and the results are not compared with analytical solutions.

 

[volaff]

Try to make a pattern of your beam and see it. . .

 

[rmo]

 

[rmo]

I explain to you in the most exhaustive and clear way possible the problem. I have done the analysis of convergence considering the minimum tension that for the formula of ships for a beam simply supported turns out in half-way to the upper flap. with regard to the minimum voltage and maximum the errors committed are small both in the case in which I use beam188 elements that plane183 (state of tension plane), in this second case I am greater than the prof wants me to explain why it is sincerely I do not know. As for the maximum shift in half-carry that I compared with that obtained from plv I get an error of 9% with beam188 elements while with plane 183 of 33 and I do not know why.

 

[gerod]

View attachment 72061

you have attached photos that have little to do with the theme. You better take them off. Thank you.

 

[volaff]

try to make a thicker mesh and see what happens

 

[F_Ingrasciotta]

I explain to you in the most exhaustive and clear way possible the problem. I have done the analysis of convergence considering the minimum tension that for the formula of ships for a beam simply supported turns out in half-way to the upper flap. with regard to the minimum voltage and maximum the errors committed are small both in the case in which I use beam188 elements that plane183 (state of tension plane), in this second case I am greater than the prof wants me to explain why it is sincerely I do not know. As for the maximum shift in half-carry that I compared with that obtained from plv I get an error of 9% with beam188 elements while with plane 183 of 33 and I do not know why.

hello, reading your problem you understand while you are using ansys "classic" and not workbench.

in order to help you could post the code you entered in ansys to understand how you shaped the beam is using beam188 and plane183.

 

[rmo]

/batch

! /com,ansys release 2024 r2 build 24.2 up20240513 21:35:54

/input,start,ans,'c:\program files\ansys inc\ansys student\v242\ansys\apdl\'

!*

!*

/nopr

keyw,pr_set,1

keyw,pr_struc,1

keyw,pr_therm,0

keyw,pr_fluid,0

keyw,pr_elmag,0

keyw,magnod,0

keyw,magedg,0

keyw,maghfe,0

keyw,magelc,0

keyw,pr_multi,0

/go

!*

! /com,

! /com,preferences for gui filtering have been set to display:

! /com, structural

!*

/prep7

!*

et,1,beam188

!*

keyopt,1,1,0

keyopt,1,2,0

keyopt,1,3,3

keyopt,1,4,0

keyopt,1,6,0

keyopt,1,7,0

keyopt,1,9,0

keyopt,1,11,0

keyopt,1,12,0

keyopt,1,15,0

!*

!*

mptemp,,,,,,,,

mptemp,1,0

mpdata,ex,1,,210000

mpdata,prxy,1,,0.3

mptemp,,,,,,,,

mptemp,1,0

mpdata,dens,1,,7850e-9

sectype, 1, beam, rect, , 0

secoffset, cent

secdata,1000,300,0,0,0,0,0,0,0,0,0,0

k, ,,,,

k, ,5000,,,

lstr, 1, 2

!*

lesize,all, , ,10, ,1, , ,1,

lmesh, 1

flst,2,1,3,orde,1

fitem,2,1

!*

/go

dk,p51x,uy, , ,0,ux,uz,rotx, , , ,

flst,2,1,3,orde,1

fitem,2,2

!*

/go

dk,p51x,uz, , ,0,uy, , , , , ,

flst,2,1,3,orde,1

fitem,2,1

!*

/go

fk,p51x,fx,30000

flst,2,1,3,orde,1

fitem,2,2

!*

/go

fk,p51x,fx,-30000

acel,0,9.81,0,

finish

/sol

! /status,solu

solve

! lgwrite,'trave corretta','lgw','c:\users\raulmo\',comment

































/batch

! /com,ansys release 2024 r2 build 24.2 up20240513 22:01:49

/input,start,ans,'c:\program files\ansys inc\ansys student\v242\ansys\apdl\'

!*

!*

/nopr

keyw,pr_set,1

keyw,pr_struc,1

keyw,pr_therm,0

keyw,pr_fluid,0

keyw,pr_elmag,0

keyw,magnod,0

keyw,magedg,0

keyw,maghfe,0

keyw,magelc,0

keyw,pr_multi,0

/go

!*

! /com,

! /com,preferences for gui filtering have been set to display:

! /com, structural

!*

/prep7

!*

et,1,plane183

!*

keyopt,1,1,0

keyopt,1,3,3

keyopt,1,6,0

!*

!*

r,1,300,

!*

rectng,0,5000,0,1000,

flst,2,1,3,orde,1

fitem,2,1

flst,2,1,3,orde,1

fitem,2,1

!*

/go

dk,p51x,uy, , ,0,ux, , , , , ,

flst,2,1,3,orde,1

fitem,2,2

!*

/go

dk,p51x, , , ,0,uy, , , , , ,

aesize,all,200,

mshkey,0

cm,_y,area

asel, , , , 1

cm,_y1,area

chkmsh,'area'

cmsel,s,_y

!*

amesh,_y1

!*

cmdele,_y

cmdele,_y1

cmdele,_y2

!*

flst,2,1,4,orde,1

fitem,2,4

/go

!*

sfl,p51x,pres,0,

flst,2,1,4,orde,1

fitem,2,2

/go

!*

sfl,p51x,pres,-0.1,

flst,2,2,4,orde,2

fitem,2,2

fitem,2,4

sfldele,p51x,pres

flst,2,1,4,orde,1

fitem,2,4

/go

!*

sfl,p51x,pres,0.1,

flst,2,1,4,orde,1

fitem,2,2

/go

!*

sfl,p51x,pres,0.1,

acel,0,9.81,0,

finish

/sol

! /status,solu

solve

finish

/prep7

sectype, 1, beam, rect, , 0

secoffset, cent

secdata,1000,300,0,0,0,0,0,0,0,0,0,0

finish

/sol

! /status,solu

solve

finish

/prep7

!*

mptemp,,,,,,,,

mptemp,1,0

mpdata,ex,1,,210000

mpdata,prxy,1,,0.3

mptemp,,,,,,,,

mptemp,1,0

mpdata,dens,1,,7850e-9

finish

/sol

! /status,solu

solve

finish

/post1

set,first

!*

! /efacet,1

! plnsol, s,x, 0,1.0

! elist,all,,,0,0

! lgwrite,'lastra corretta','lgw','c:\users\raulmo\',comment

una è la trave beam188 l’altra plane183, non sono ripuliti ma girano

 

[F_Ingrasciotta]

for the code I look calmer tonight, but are you sure that the difference is not trivially linked to the question timoshenko/bernulli? in the beam188 code does not seem to have seen the command seccontrol,txz,,txy

 

[rmo]

Yes! in case I use beam elements should be that. I used the plv for analytical solution so I did hp of eb beams instead ansys uses timoshenko right? is there any way to change the model?

 

[F_Ingrasciotta]

Yes! in case I use beam elements should be that. I used the plv for analytical solution so I did hp of eb beams instead ansys uses timoshenko right? is there any way to change the model?

Yes, use timoshenko, to change and use seals you have to provide cutting deformability values by seccontrol command.

Look at me. This is what slide presentation 41 to 44.