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Nonlinear analysis in ANSYS 
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#1
Jan1713, 11:20 AM

P: 13

hi,
I have some confusion for performing nonlinear analysis in ANSYS with NLGEOM.... I was following the tutorial, the APDL is given below /prep7 ! start preprocessor /title,NonLinear Analysis of Cantilever Beam k,1,0,0,0 ! define keypoints k,2,5,0,0 ! 5" beam (length) l,1,2 ! define line et,1,beam3 ! Beam r,1,0.03125,4.069e5,0.125 ! area, izz, height of beam mp,ex,1,30.0e6 ! Young's Modulus mp,prxy,1,0.3 ! Poisson's ratio esize,0.1 ! element size of 0.1" lmesh,all ! mesh the line finish ! stop preprocessor /solu ! start solution phase antype,static ! static analysis nlgeom,on ! turn on nonlinear geometry analysis autots,on ! auto time stepping nsubst,5,1000,1 ! Size of first substep=1/5 of the total load, max # substeps=1000, min # substeps=1 outres,all,all ! save results of all iterations dk,1,all ! constrain all DOF on ground fk,2,mz,100 ! applied moment solve /post1 pldisp,1 ! display deformed mesh PRNSOL,U,X ! lists horizontal deflections the maximum displacement is 1.019 now without NLGEOM option that is just omitting these lines from above apdl prog nlgeom,on ! turn on nonlinear geometry analysis autots,on ! auto time stepping nsubst,5,1000,1 ! Size of first substep=1/5 of the total load, max # substeps=1000, min # substeps=1 outres,all,all ! save results of all iterations maximum displacement is 1.024 , which should be less then the previous analysis with NLGEOM on I don't understand this... kindly guide me where I am wrong 


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