Dear all:
I recently find an example in ABAQUS documentation cannont convergence.
The parametres related with the iteration of the Risk method is
arc length initial increment minmum increment maximum increment maximum number
1 0.0001 1E-10 1E+36 100000
The location of the exmaple in ABAQUS documentation is Abaqus Example Problems Manual->1 Static Stress/Displacement Analyses->1.1 Static and quasi-static stress analyses-> 1.1.5Collapse of a concrete slab
The .inp file named as collapseconcslab_s8r.inp in the documentation is as follows:
*HEADING
CORNER SUPPORTED TWO-WAY SLAB TESTED
BY MCNEICE
*NODE
1,0.,0.
7,18.,0.
61,0.,18.
67,18.,18.
*NGEN,NSET=Y-SYM
1,7
*NGEN,NSET=X-SYM
1,61,10
*NGEN,NSET=LX2
61,67
*NGEN,NSET=LY2
7,67,10
*NSET,NSET=ONE
1,
*NFILL
X-SYM,LY2,6,1
*ELEMENT,TYPE=S8R,ELSET=SLAB
1,1,3,23,21,2,13,22,11
*ELGEN,ELSET=SLAB
1,3,2,1,3,20,3
*SHELL SECTION,ELSET=SLAB,MATERIAL=A1
1.75,9
*REBAR LAYER
YY,0.014875, 1.0, -0.435,SLABMT,90,1
XX,0.014875, 1.0, -0.435,SLABMT,0,1
*MATERIAL,NAME=A1
*ELASTIC
4.15E6,.15
*CONCRETE
3000.,0.
5500.,.0015
*FAILURE RATIOS
1.16 , .0836
*TENSION STIFFENING
1.,0.
0.,2.E-3
*MATERIAL,NAME=SLABMT
*ELASTIC
29.E6,
*PLASTIC
50.E3,
*BOUNDARY
Y-SYM,YSYMM
X-SYM,XSYMM
67,3
*RESTART,WRITE,FREQUENCY=999
*STEP
*STATIC,RIKS
.05,1.,,,,1,3,-1.
*CLOAD
1,3,-5000.
*EL PRINT,FREQUENCY=10
S,
SINV,
E,
PE,
CRACK,
*EL FILE,FREQUENCY=10
S,
SINV,
E,
PE,
CRACK,
*OUTPUT,FIELD,FREQ=10
*ELEMENT OUTPUT
S,
SINV,
E,
PE,
*ELEMENT OUTPUT,REBAR
S
*NODE FILE,NSET=ONE
U,
*OUTPUT,FIELD
*NODE OUTPUT,NSET=ONE
U,
*END STEP
Thanks with best regards
Jarivis Yang