薄膜太薄时收敛问题
薄壳收敛问题，当壳的厚度比较大时可以收敛，小的时候就不收敛了。膜厚度R,1,0.03, , , , , ,时收敛，但是R,1,0.03/10, , , , , ,不收敛，我给它加了阻尼，但是不起作用。下面是我的命令流
FINISH! Make sure we are at BEGIN level
/CLEAR,NOSTART! Clear model since no SAVE found
/PREP7
BOPTN,KEEP,0
BOPTN,NWARN,0
BOPTN,VERS,RV52
BTOL,1e-005,
/PNUM,KP,0
/PNUM,LINE,0
/PNUM,AREA,1
/PNUM,VOLU,0
/PNUM,NODE,0
/PNUM,TABN,0
/PNUM,SVAL,0
/NUMBER,0
!*
/PNUM,MAT,0
!*
!*
ET,1,SHELL181
KEYOPT,1,1,0
KEYOPT,1,3,2
!
ET,2,BEAM44
!*
!*
!* 膜材料
!*
MPTEMP,,,,,,,,
MPTEMP,1,0
MPDATA,EX,1,,15e9
MPDATA,PRXY,1,,0.3
MPDATA,DENS,1,,0.1/0.0003
MPDATA,BETA,1,,0.05
!
!*
!*膜厚度
!*
R,1,0.03/10, , , , , ,
RMORE, , , ,
RMORE
RMORE, ,
/PREP7
RECTNG,-10,10,-10,10,
TYPE, 1
MAT, 1
REAL, 1
ESYS, 0
SECNUM,
!*
!*定义网格密度
!*
LESIZE,ALL,0.5, , , ,1, , ,1,
MSHAPE,1,2D
MSHKEY,0
AMESH, 1
ALLSEL,ALL
/GO
SFA,1,1,PRES,400
DK,1, , , ,0,ALL, , , , , ,
DK,2, , , ,0,ALL, , , , , ,
DK,3, , , ,0,ALL, , , , , ,
DK,4, , , ,0,ALL, , , , , ,
finish
/solu
antype,static
nropt,full, ,on
nlgeom,on
pstr,on ! prestress analysis
sstif,on
NSUBST,20,
AUTOTS,on
TIME,1
LUMPM,0
EQSLV, , ,0,
PRECISION,0
MSAVE,0
PIVCHECK,1
ematwrite,yes
OUTRES,ERASE
OUTRES,ALL,ALL
solve
fini
出现的错误为
计算到最后不收敛，如下图
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