** connector friction tests for SLIDE-PLANE
**   -PREDEFINED + PRESTRESS
**   -CUSTOMIZED + PRESTRESS
** results should be identical between the two connector elements
**------------------------------------------------
*preprint,model=yes
*Node,nset = all
101,0,0,0
102,1,0,0
201,2,0,0
202,3,0,0
*orientation,name=global
1,0,0, 0,1,0
3,0.0
**-------------------------------------------------
*element,type=mass,elset=mass
10001,101
10002,102
20001,201
20002,202
*mass,elset=mass
1.0,
*element,type=rotaryI,elset=rotaryI
110001,101
110002,102
120001,201
120002,202
*rotary inertia,elset=rotaryI
1.0,1.0,1.0
**-------------------------------------------------
*element,type=conn3d2,elset=slidePredef
1001,101,102
*connector section,elset=slidePredef,behavior=fricPredef
slide-plane,
global,
**-------
*connector behavior,name=fricPredef
*connector friction, predefined
1.25
*friction
0.1,
**-------
*connector elastic,comp=2
12.0,
*connector elastic,comp=3
12.0,
**--------------------------------------------------
*element,type=conn3d2,elset=slideCustom
2001,201,202
*connector section,elset=slideCustom,behavior=fricCustom
slide-plane,
global,
**--------------
*connector behavior,name=fricCustom
*connector derived component, name=norm
1,
1.0,
*connector friction,contact force=norm
1.25,    0.0
1.20, 1000.0
*connector potential
2,
3,
*friction
0.1,
**------
*connector elastic,comp=2
12.0,
*connector elastic,comp=3
12.0,
**--------------------------------------------------
*boundary
101,1,6
201,1,6
*elset,elset=conn
 slidePredef,slideCustom
*amplitude,name=backforth
0,0,  0.6, 0.6, 1.0,0.2
*amplitude,name=step
0,1,1,1
*initial conditions, type=vel
102,2,2.0
102,3,3.0
202,2,2.0
202,3,3.0
**--------------------------------------------------
*step
*dynamic, explicit, direct user control
1.0E-04, 1.0
*cload,amplitude=step
**load that creates constraint forces
102,1,11.0
202,1,11.0
*boundary,type=vel,amplitude=backforth
102,2,2,2.0
102,3,3,3.0
202,2,2,2.0
202,3,3,3.0
*OUTPUT, FIELD, NUMBER INTERVAL=5
*NODE OUTPUT,nset=all
U,
*OUTPUT,HISTORY
*NODE OUTPUT,nset=all
U,
*ELEMENT OUTPUT,elset=conn
CU,CASU,CEF,CSF,CTF,CNF,CSF,CIVC
*ENERGY OUTPUT,VARIABLE=ALL
*end step
**--------------------------------------------------
*step
*dynamic, explicit, direct user control
1.0E-04, 1.0
*cload,amplitude=step
**load that creates constraint forces
102,1,11.0
202,1,11.0
*cload 
102,2,10.0
102,3,15.0
202,2,10.0
202,3,15.0
*boundary,op=new
101,1,6
201,1,6
*OUTPUT, FIELD, NUMBER INTERVAL=5
*NODE OUTPUT,nset=all
U,
*OUTPUT,HISTORY
*NODE OUTPUT,nset=all
U,
*ELEMENT OUTPUT,elset=conn
CU,CASU,CEF,CSF,CTF,CNF,CSF,CIVC
*ENERGY OUTPUT,VARIABLE=ALL
*end step
**--------------------------------------------------