Multiple mode geometric Imperfection

- August 8, 2019 at 4:37 am
  
  Venugopalb
  Subscriber
  
  Hello all!
  
  I am doing nonlinear buckling analysis, I need to incorporate the geometric imperfection into the model. I already know how to add geometric imperfection by using one mode shape. I would like to add a combination of mode shapes as a geometric imperfection(like modes 1,2,3 in linear buckling analysis). Is it possible to add it in workbench?
  
  Thanks in Advance!
- August 8, 2019 at 9:19 am
  jj77
  Subscriber
  See this video: In the upgeom.inp they show in the video you need to add another line with UPGEOM for a second mode (so say we want first and third mode to be combined). So the upgeom file would be then:
  
  /prep7
  
  UPGEOM, 0.001, 1, 1, file, rst,
  
  UPGEOM, 0.001, 1, 3, file, rst,
  
  cdwrite,db,file,cdb
  
  Or one could loop over ten modes adding a tenth of each mode (this is from an old help manual v16 ch 21.6):
```
/prep7

*do,i,1,10

upgeom,0.1,1,i,file,rst       ! Add imperfections as a tenth of each mode shape

*enddo
cdwrite,db,file,cdb
```

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