General Mechanical

General Mechanical

Multiple mode geometric Imperfection

    • 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!

    • 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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