Error: Invalid topology for mapped brick meshing

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  • Last Post 18 November 2018
Abkhan274 posted this 15 November 2018

Hello guys,

I am new with Ansys. I created a geometry of a rectangular hollow steel section with solid 185 element. When I apply the mesh command, there appears a topology error. I've been trying to solve this error for quite a while but in vain. What I've understood is that there is some kind of problem in attributing element but I can't figure it out. It would be a big help if someone can review the code

 

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Aniket posted this 16 November 2018

Abkhan274,

ANSYS employees cannot download any attachments on a public forum. So can you please post the code inline along with inline images?

Also, from the description, it seems like you are using APDL to create and mesh this model. These things are comparatively easy for a new user inside workbench Mechanical. Is there any specific reason that you are not using Workbench and using APDL?

Abkhan274 posted this 18 November 2018

Yes I am using APDL. I am working on my master thesis and my supervisor asked me to use it.

finish
/clear,start

*afun,deg
/UNITS,SI


!chord parameters
B=0.280
H=0.280   
T=0.020
Len=2.80

!brace parameters
bo=0.140
ho=0.140
to=0.020
lob=0.70    !length of brace
lo=1.47        !location of brace from chord origin
linc=1.26    !location of 2nd brace from chord origin

EM=210000
PR=0.3
force=2000

/prep7
!keypoints for chord
k,1,0,0,0
k,2,B,0,0
k,3,B,H,0
k,4,0,H,0
    !Keypoints at middle of outer rec.
k,5,0,H/2,0
k,6,B/2,0,0
k,7,B,H/2,0
k,8,B/2,H,0
    !Keypoints at middle of inner rect.
k,9,B/2,H-T,0
k,10,T,H/2,0
k,11,B/2,T,0
k,12,B-T,H/2,0

!Keypoints for brace
    !Outer sec.
    k,21,0.070,H+lob,lo
    k,22,0.210,H+lob,lo
    k,23,0.210,H+lob,lo-0.140
    k,24,0.070,H+lob,lo-0.140

    !Keypoints at middle of outer rec.
    k,25,0.070,H+lob,lo-0.070
    k,26,0.140,H+lob,lo
    k,27,0.210,H+lob,lo-0.070
    k,28,0.140,H+lob,lo-0.140
   
    !inner rec.
    k,29,0.090,H+lob,lo-0.020
    k,30,0.190,H+lob,lo-0.020
    k,31,0.190,H+lob,lo-0.1-0.02
    k,32,0.090,H+lob,lo-0.1-0.02

!keypoints for 2nd brace (outer sec. on chord end)
k,33,0.070,H,linc
k,34,0.21,H,linc
k,35,0.21,H,linc-0.2178        !(1.54+0.2178)
k,36,0.070,H,linc-0.2178


    !(inner sec. on chord end)
    k,37,0.090,H,1.24
    k,38,0.190,H,1.24
    k,39,0.190,H,1.0622
    k,40,0.090,H,1.0622

!(outer sec. on free end)
k,41,0.07,H+0.4499,0.724
k,42,0.21,H+0.4499,0.724
k,43,0.21,H+0.3427,0.63401
k,44,0.07,H+0.3427,0.63401
   
    !(inner sec. on free end)
    k,45,0.090,H+0.4345,0.7111
    k,46,0.190,H+0.4345,0.7111
    k,47,0.190,H+0.3580,0.6468
    k,48,0.090,H+0.3580,0.6468

l,5,10
l,6,11
l,7,12
l,8,9
allsel,all

!Chord cross section
rectng,0,B,0,H
rectng,T,B-T,T,H-T
asba,1,2,,delete,delete
allsel,all

vext,all,,,0,0,Len

!Brace cross section
a,21,22,23,24
a,29,30,31,32
asel,all
asba,11,12,,delete,delete
asel,all
aglue,all
allsel,all

!Extruding brace area by offset
voffst,13,-lob

!2nd brace area
a,33,34,35,36    !outer sec
a,37,38,39,40    !inner sec


!2nd brace x-area at free end
!area
a,41,42,43,44
a,45,46,47,48

asba,21,22,,delete,delete
asel,all

btol,0.10e-1        !increasing the tolerance level so that the points within increased distanced are assumed to be coincident

asba,23,24,,delete,delete
asel,all

!Creating volume for incline brace by selecting keypoints of already defined area
v,37,38,39,40,45,46,47,48
v,33,34,35,36,41,42,43,44
vovlap,3,4
vdele,3
allsel,all
adele,28
!vglue,all
!aglue,all

et,1,185
mp,ex,1,EM                ! Definiere E-Modul
mp,prxy,1,PR

!esize,0.5
mat,1
type,1


mshape,0
mshkey,1

vmesh,all

 


!Boundary conditions (inclined brace free end)
!local,11,0,0,0.72990,0.7240,0,40,0,1,1
!allsel,all

!ksel,s,loc,z,0    !2nd brace (inclined)
!ksel,r,loc,y,0,0.140
!ksel,r,loc,x,0,0.140
!dk,all,uz,0
!ksel,all

Abkhan274 posted this 18 November 2018

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