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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,1,0.03125,4.069e-5,0.125 ! 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 non-linear 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 non-linear 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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# Nonlinear analysis in ANSYS

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