BEAM189压杆屈曲分析特征值比非线性值小
我用BEAM189做压杆屈曲分析。先做特征值分析，结果与理论值一样。然后接着做非线性屈曲分析，结果竟然比特征值分析所得结果大，前者为42346，后者为time=43833。
按照我的理解，42346N就是临界屈曲力的大小，而43833就是非线性分析时导致压杆屈曲的力的大小。
若是如此，则后者应该比前者小。但为什么大呢。下面是我的命令。求助呀。
/FILNAME,file,0
/TITLE,file
/PREP7
!*
ET,1,BEAM189
!*
!*
MPTEMP,,,,,,,,
MPTEMP,1,0
MPDATA,EX,1,,206e9
MPDATA,PRXY,1,,0.3
SECTYPE, 1, BEAM, RECT, , 0
SECOFFSET, CENT
SECDATA,0.05,0.05,0,0,0,0,0,0,0,0,0,0
K,1,0,0,0,
K,2,5,0,0,
LSTR, 1, 2
FLST,5,1,4,ORDE,1
FITEM,5,1
CM,_Y,LINE
LSEL, , , ,P51X
CM,_Y1,LINE
CMSEL,,_Y
!*
LESIZE,_Y1, , ,100, , , , ,1
!*
LMESH, 1
FLST,2,201,1,ORDE,2
FITEM,2,1
FITEM,2,-201
!*
/GO
D,P51X, , , , , ,UZ,ROTX,ROTY, , ,
FLST,2,1,1,ORDE,1
FITEM,2,2
!*
/GO
D,P51X, , , , , ,UY,UZ,ROTX,ROTY, ,
FLST,2,1,1,ORDE,1
FITEM,2,1
!*
/GO
D,P51X, , , , , ,UX,UY,UZ,ROTX,ROTY,
FLST,2,1,1,ORDE,1
FITEM,2,2
!*
/GO
F,P51X,FX,-1
SAVE
FINISH
/SOL
!*
ANTYPE,0
PSTRES,1
/STATUS,SOLU
SOLVE
FINISH
/SOLU
!*
ANTYPE,1
!*
BUCOPT,LANB,5,0,0,
MXPAND,5,0,1000000,1,0.001,
/STATUS,SOLU
SOLVE
FINISH
/POST1
SET,LIST
SAVE
!*
*GET,load,ACTIVE, ,SET,FREQ
FINISH
/PREP7
FINISH
/SOL
FINISH
/PREP7
SAVE
SAVE
/BATCH
/COM,ANSYS RELEASE 13.0 UP20101012 01:00:07 02/27/2012
/input,menust,tmp,'',,,,,,,,,,,,,,,,1
/COM,ANSYS RELEASE 13.0 UP20101012 01:00:07 02/27/2012
/GRA,POWER
/GST,ON
/PLO,INFO,3
/GRO,CURL,ON
/CPLANE,1
/REPLOT,RESIZE
WPSTYLE,,,,,,,,0
/SOLU
FINISH
/POST1
SET,LIST
SET,LIST,999
SET,,, ,,, ,1
!*
*GET,solution,ACTIVE, ,SET,FREQ
FINISH
/PREP7
UPGEOM,0.001,1,1,'file','rst',' '
!*
FINISH
/SOL
!*
ANTYPE,0
ANTYPE,0
NLGEOM,1
NSUBST,50,10000,50
OUTRES,ERASE
OUTRES,ALL,ALL
LNSRCH,1
TIME,1.15*solution
DOFSEL,S,FX
FSCALE,1.15*solution,
DOFSEL,ALL
!*
/STATUS,SOLU
SOLVE 不是很懂啊
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