*heading
 test Bergstrom-Boyce elastomeric hysteresis model.
 uniaxial cyclic loading with relaxation segments of 30s.
 strain rate=-.1/s, material: Chloroprene Rubber (15 pph carbon black)
*node
1,0.,0.
2,1.4e-2,0.
3,1.4e-2,1.3e-2
4,0.,1.3e-2
*nset,nset=top
3,4
*nset,nset=bot
1,2
*element,type=cax4,elset=eall
1,1,2,3,4
*solid section,elset=eall,material=hyster
*material,name=hyster
*hyperelastic,arruda-boyce,MODULI=LONG TERM
0.6,2.8284,0.01
*hysteresis
1.6,.9526,4.,-1.0
*boundary
bot,2,2,0.
**
**STEP 1
**load up to strain of -0.26
*DIAGNOSTICS,NONHYBRID=WARNING
*step,nlgeom,inc=100,unsymm=yes
*static
.26,2.6
*boundary
top,2,2,-2.976e-3
*el print
s, 
le, 
*node print,f=5
rf,u
*OUTPUT,FIELD
*ELEMENT OUTPUT
s,le
*OUTPUT,FIELD
*NODE OUTPUT
u,rf
*end step
**
**STEP 2
**relax
*step,nlgeom,inc=100,unsymm=yes
*static
3.,30.
*end step
**
**STEP 3
**load up to strain of -0.54
*step,nlgeom,inc=100,unsymm=yes
*static
.28,2.8,
*boundary
top,2,2,-5.424e-3
*end step
**
**STEP 4
**relax
*step,nlgeom,inc=100,unsymm=yes
*static
3.,30.
*end step
**
**STEP 5
**load up to strain of -0.72
*step,nlgeom,inc=100,unsymm=yes
*static
.18,1.8
*boundary
top,2,2,-6.672e-3
*end step
**
**STEP 6
**unload to strain of -0.54
*step,nlgeom,inc=100,unsymm=yes
*static
.18,1.8
*boundary
top,2,2,-5.424e-3
*end step
**
**STEP 7
**relax
*step,nlgeom,inc=100,unsymm=yes
*static
3.,30.
*end step
**
**STEP 8
**unload to strain of -0.26
*step,nlgeom,inc=100,unsymm=yes
*static
.28,2.8,
*boundary
top,2,2,-2.976e-3
*end step
**
**STEP 9
**relax
*step,nlgeom,inc=100,unsymm=yes
*static
3.,30.
*end step
**
**STEP 10
**unload to strain of 0.0
*step,nlgeom,inc=100,unsymm=yes
*static
.26,2.6
*boundary
top,2,2,0.0
*end step
**