Hi all,

Can someone please help me in changing the .inp file below to allow for explicit analysis. I want to directly compare the results from the two simulations. I realise some of the commands in this .inp file are old and almost obsolete, but all I want to change is the step type. What I have tried both of the following:

1. Changed the lines 

*STEP, NAME=close_roller, nlgeom=YES, inc=500
*STATIC
0.05, 1.000000, 1e-06, 1.000000

to

*Step, name=close_roller, nlgeom=YES
*Dynamic, Explicit
, 0.400080
*Bulk Viscosity
0.06, 1.2
** Mass Scaling: Semi-Automatic
** sheet
*Fixed Mass Scaling, elset=E_BAR_0, factor=2000.

2. Changed the lines 

*STEP, NAME=rotate_roller, nlgeom=YES, inc=2000
*STATIC
0.05, 0.400080, 1e-06, 0.400080

to

*Step, name=rotate_roller, nlgeom=YES
*Dynamic, Explicit
, 0.400080

but I keep getting the error ``KEYWORD CARDS FOR STEP DEPENDENT INPUT MUST APPEAR AFTER THE FIRST *STEP CARD." The .inp file runs fine in the implicit case

** Roll Set-up Specifications **
**note: delh is gauge half-reduction(m), r: reduction (%), U: roller surface velocity, h0 is half-thickness(m)
**Nx=180;
**Ny=18;
**Nz=0;
**h0=0.05;
**h1=0.04;
**r=0.2;
**delh_tot=0.01;
**delh_top=0.010000000000000002;
**delh_bot=0.010000000000000002;
**R_top=0.13;
**R_bot=0.13;
**fr_top=0.3;
**fr_bot=0.3;
**U_top=1.24974997499;
**U_bot=1.24974997499;
**ms=2;
**width=0;
**length=1.0;
**l_rollbite=0.05;
**delta=1.0;
**refNode=150000000;
**materialproperties=
** elasticity=(1e+11, 0.3)
** plasticity=
** (173205080.757, 0)
** density=2700.0
**.INP File Starts Here **
*HEADING  
Plate Rolling: Plane strain, ABAQUS/Standard
(Analytical rigid surfaces)
SECTION CONTROLS USED (HOURGLASS=STIFFNESS))
Units - N, m 
** Workpiece Geometry - 2*h0 thickness**
*NODE
1, 0.05, -0.05
3259, 0.05, 0.05
181, -0.95, -0.05
3439, -0.95, 0.05
*NGEN, NSET=N_SURF_0
1, 181, 1
*NGEN, NSET=N_SURF_1
3259, 3439, 1
*NFILL,NSET=N_BAR_0
N_SURF_0, N_SURF_1, 18, 181
*ELEMENT, TYPE=CPE4R, ELSET=E_BAR_0
1, 1, 182, 183, 2
*ELGEN, ELSET=E_BAR_0
1, 180, 1, 1, 18, 181, 180
*ELSET,ELSET=E_SURF_0, GEN
1, 180, 1
*ELSET,ELSET=E_SURF_1, GEN
3061, 3240, 1
** Define bar material behaviour ** 
*SOLID SECTION, ELSET=E_BAR_0, MAT=WeakPerfectPlasticAprox, CONTROLS=SECT
1., 
*SECTION CONTROLS, NAME=SECT, HOURGLASS=STIFFNESS
*MATERIAL,NAME=WeakPerfectPlasticAprox
*ELASTIC 
1e+11, 0.3 
*PLASTIC 
300000000.0,0
*DENSITY 
2700.0, 
** Top Roll **
*NODE,NSET=REFTOP
150000000, 0.0 , 0.181
*SURFACE, TYPE=ELEMENT, NAME=SURFTOP, REGION TYPE=SLIDING
E_SURF_1,S2
*SURFACE, TYPE=SEGMENTS, NAME=RIGIDTOP
START,0.0,0.051
CIRCL,-0.13,0.181,0.0,0.181
CIRCL,0.0,0.311,0.0,0.181
CIRCL,0.13,0.181,0.0,0.181
CIRCL,0.0,0.051,0.0,0.181
*RIGID BODY, REFNODE=150000000, ANALYTICAL SURFACE=RIGIDTOP
** Bottom Roll **
*NODE,NSET=REFBOT
150000001, 0.0 , -0.181
*SURFACE, TYPE=ELEMENT, NAME=SURFBOT, REGION TYPE=SLIDING
E_SURF_0,S4
*SURFACE, TYPE=SEGMENTS, NAME=RIGIDBOT
START,0.0,-0.311
CIRCL,-0.13,-0.181,0.0,-0.181
CIRCL,0.0,-0.051,0.0,-0.181
CIRCL,0.13,-0.181,0.0,-0.181
CIRCL,0.0,-0.311,0.0,-0.181
*RIGID BODY, REFNODE=150000001, ANALYTICAL SURFACE=RIGIDBOT
** RAMPING DEFINITION **
*AMPLITUDE, NAME=apply_squeeze_ramp, DEFINITION=SMOOTH STEP
0,0,0.8,1
*AMPLITUDE, NAME=apply_roll_ramp, DEFINITION=SMOOTH STEP
0,0,1,1
** Surface Interactions **
*SURFACE INTERACTION,NAME=FRICTTOP
*FRICTION 
0.3,
*SURFACE BEHAVIOR, pressure-overclosure=EXPONENTIAL
0.0001, 100.
*SURFACE INTERACTION,NAME=FRICTBOT
*FRICTION
0.3, 
*SURFACE BEHAVIOR, pressure-overclosure=EXPONENTIAL
0.0001, 100.
*CONTACT PAIR,INTERACTION=FRICTTOP, type=SURFACE TO SURFACE
SURFTOP,RIGIDTOP
*CONTACT PAIR,INTERACTION=FRICTBOT, type=SURFACE TO SURFACE
SURFBOT,RIGIDBOT
** STEPPING INFORMATION **
*STEP, NAME=close_roller, nlgeom=YES, inc=500
*STATIC
0.05, 1.000000, 1e-06, 1.000000
** Top Roll Boundary Conditions **
*BOUNDARY
150000000,1,1
150000000,6,6
*BOUNDARY,TYPE=DISPLACEMENT, AMPLITUDE=apply_squeeze_ramp
150000000,2,2,-0.011
** Bottom Roll Boundary Conditions**
*BOUNDARY
150000001,1,1
150000001,6,6
*BOUNDARY,TYPE=DISPLACEMENT, AMPLITUDE=apply_squeeze_ramp
150000001,2,2,0.011
** Request output data **
*OUTPUT, FIELD, variable=PRESELECT, NUMBER INTERVAL=3
CSTRESS
*OUTPUT, FIELD, NUMBER INTERVAL=3
*ELEMENT OUTPUT
S,PEEQ,
*NODE OUTPUT
U,RF, V,
*OUTPUT,HISTORY, FREQUENCY=4, NAME=REFTOP
*NODE OUTPUT,NSET=REFTOP
RF2,RM3
*OUTPUT,HISTORY, FREQUENCY=4, NAME=REFBOT
*NODE OUTPUT,NSET=REFBOT
RF2,RM3
*OUTPUT,HISTORY, FREQUENCY=4
SSPEEQ,SSTORQ,SSFORC
*INCREMENTATION OUTPUT
*OUTPUT, HISTORY, VAR=PRESELECT
*ENERGY OUTPUT, VAR=PRESELECT
*ENDSTEP 
*STEP, NAME=rotate_roller, nlgeom=YES, inc=2000
*STATIC
0.05, 0.400080, 1e-06, 0.400080
** Top Roll Boundary Conditions **
*BOUNDARY
150000000,1,1
*BOUNDARY,TYPE=DISPLACEMENT
150000000,2,2,-0.011
150000000,3,5
*BOUNDARY,TYPE=VELOCITY, AMPLITUDE=apply_roll_ramp
150000000,6,6,9.613461346115374
** Bottom Roll Boundary Conditions**
*BOUNDARY
150000001,1,1
*BOUNDARY,TYPE=DISPLACEMENT
150000001,2,2,0.011
150000001,3,5
*BOUNDARY,TYPE=VELOCITY, AMPLITUDE=apply_roll_ramp
150000001,6,6,-9.613461346115374
** Request output data **
*OUTPUT, FIELD, variable=PRESELECT, NUMBER INTERVAL=20
CSTRESS
*OUTPUT, FIELD, NUMBER INTERVAL=20
*ELEMENT OUTPUT
S,PEEQ,
*NODE OUTPUT
U,RF, V,
*OUTPUT,HISTORY, FREQUENCY=4, NAME=REFTOP
*NODE OUTPUT,NSET=REFTOP
RF2,RM3
*OUTPUT,HISTORY, FREQUENCY=4, NAME=REFBOT
*NODE OUTPUT,NSET=REFBOT
RF2,RM3
*OUTPUT,HISTORY, FREQUENCY=4
SSPEEQ,SSTORQ,SSFORC
*INCREMENTATION OUTPUT
*OUTPUT, HISTORY, VAR=PRESELECT
*ENERGY OUTPUT, VAR=PRESELECT
*ENDSTEP 

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