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用riks算一个薄壁变截面圆管屈曲的时候收敛非常慢,实在没有耐心了,abaqus版关于屈曲的帖子好少啊,希望大侠斑竹们能够开了贴整理汇总一下有关屈曲方面的知识给我们学习学习啊,贴上inp,求牛人指导,下面是部分inp内容
*Elset, elset=_PickedSet3_#12, internal, generate
1, 112, 1
** Section: Section-1
*Solid Section, elset=_PickedSet3_#12, material=tj
,
** Section: Section-1
*Solid Section, elset=_PickedSet3_#13, material=tj
,
** Section: Section-1
*Solid Section, elset=_PickedSet4_#14, material=tj
,
** Section: Section-1
*Solid Section, elset=_PickedSet10_#15, material=tj
,
*End Part
** BOUNDARY CONDITIONS
**
** Name: BC-1 Type: Displacement/Rotation
*Boundary
_PickedSet242, 1, 1
_PickedSet242, 2, 2
_PickedSet242, 3, 3
_PickedSet242, 4, 4
_PickedSet242, 5, 5
_PickedSet242, 6, 6
** ----------------------------------------------------------------
**
** STEP: Step-1
**
*Step, name=Step-1, nlgeom=YES
*Static, riks
1., 1., 1e-05, , ,
**
** LOADS
**
** Name: Load-1 Type: Concentrated force
*Cload
_PickedSet238, 1, 700.
** Name: Load-2 Type: Concentrated force
*Cload
_PickedSet239, 1, 1170.
** Name: Load-3 Type: Concentrated force
*Cload
_PickedSet240, 1, 1840.
** Name: Load-4 Type: Concentrated force
*Cload
_PickedSet241, 1, 780.
** Name: Load-5 Type: Gravity
*Dload
, GRAV, 9.8, 0., -1., 0.
**
** OUTPUT REQUESTS
**
*Restart, write, frequency=0
**
** FIELD OUTPUT: F-Output-1
**
*Output, field
*Node Output
CF, RF, U
*Element Output, directions=YES
ELEDEN, ELEN, ENER, LE, PE, PEEQ, PEMAG, S
*Contact Output
CDISP, CSTRESS
**
** HISTORY OUTPUT: H-Output-1
**
*Output, history, variable=PRESELECT
*End Step
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