# Contact Friction II — Welcome to LS-DYNA Examples

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This models a drum rotating with initial angular velocity. The drum is brought to rest by a rubber pad pressed against it. From this example you can learn about friction, rubber, rigid material and angular velocity.

## Keywords

```*BOUNDARY_SPC_SET
*CONSTRAINED_EXTRA_NODES_NODE
*CONSTRAINED_NODE_SET
*CONTACT_NODES_TO_SURFACE
*CONTROL_CONTACT
*CONTROL_ENERGY
*CONTROL_TERMINATION
*CONTROL_TIMESTEP
*DATABASE_BINARY_D3PLOT
*DATABASE_GLSTAT
*DATABASE_HISTORY_NODE_SET
*DATABASE_MATSUM
*DATABASE_NODOUT
*DATABASE_RCFORC
*DEFINE_CURVE
*ELEMENT_SHELL
*ELEMENT_SOLID
*END
*INITIAL_VELOCITY_GENERATION
*KEYWORD
*MAT_MOONEY-RIVLIN_RUBBER
*MAT_RIGID
*NODE
*PART
*SECTION_SHELL
*SECTION_SOLID
*SET_NODE_LIST
*TITLE```

## Reduced Input

```  *KEYWORD
*TITLE
\$ learn friction, rubber and rigid material, and angular velocity
\$ drum with radius of 200 mm width of 150 mm and thickness of 5 mm
\$ is rotating with initial angulay velocity. The drum is to be brought to
\$ rest by rubber brake pad 50x100x100 mm. The normal force pressing the pad
\$ against the drum is 3498 N. The friction coeffecient is 0.15.
\$ units: m, s, Kg, N
\$ A. Tabiei 3/3/98
\$---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
*CONTROL_TIMESTEP
0.0000    0.9000
*CONTROL_TERMINATION
0.2500
*CONTROL_CONTACT
\$   SLSFAC    RWPNAL    ISLCHK    SHLTHK    PENOPT    THKCHG     ORIEN
2         2
\$   USRSTR    USRFAC     NSBCS    INTERM     XPENE

*CONTROL_ENERGY
\$     hgen      rwen    slnten     rylen
2                   2
\$---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
*DATABASE_BINARY_D3PLOT
0.01
*DATABASE_MATSUM
0.100E-04
*DATABASE_NODOUT
0.100E-04
*DATABASE_RCFORC
0.100E-02
*DATABASE_GLSTAT
0.100E-04
*DATABASE_HISTORY_NODE_SET
10
\$---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
*MAT_RIGID
\$      MID        RO         E        PR
1 7.890E+03 2.100E+11 3.000E-01
\$      CMO       CON      CON2
1.000E+00 7.000E+00 6.000E+00
\$ alternative method for specifying local system below (optional)

*MAT_MOONEY-RIVLIN_RUBBER
\$      MID        RO        PR         A         B
2 5.000E+03 4.900E-01 5.520E+05 1.380E+05
\$ if A=B=0, then a least square fit is computed from test based on data below

\$---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
*SECTION_SHELL
1         2 0.000E+00 3.000E+00 0.000E+00 0.000E+00
5.000E-03 5.000E-03 5.000E-03 5.000E-03 0.000E+00
*SECTION_SOLID
2         1
*PART
DRUM:
1         1         1
*PART
2         2         2
\$---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
*CONSTRAINED_NODE_SET
\$     NSID       DOF
11         1
*CONSTRAINED_EXTRA_NODES_NODE
\$      PID  NID/NSID
1       259
\$---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
*INITIAL_VELOCITY_GENERATION
\$       ID      STYP     OMEGA
1         2 3.000E+02
\$       XC        YC        ZC        NX        NY        NZ     PHASE
0.000E+00 0.000E+00 0.000E+00 0.000E+00 1.000E+00 0.000E+00         0
\$---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
*SET_NODE_LIST
10
259
*SET_NODE_LIST
11
215       216       219       220       223       224       227       228
231       232       235       236       239       240       243       244
247       248       251       252       255       256
\$---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
*CONTACT_nodes_TO_surface
2         1         3         3                             0         0
0.1500000 0.1500000 0.0000000 0.0000000 0.0000000         0 0.0000000 1.000E+20
1.0000000 1.0000000 0.0000000 0.0000000 1.0000000 1.0000000 1.0000000 1.0000000

\$---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
*DEFINE_CURVE
1
0.00000000000000E+00 1.0000000000000E+00
1.00000000000000E+04 1.0000000000000E+00
\$ NID/NSID       DOF      LCID        SF       CID
11         1         1 -1.59E+02         0
\$---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
*BOUNDARY_SPC_SET
\$ NID/NSID       CID      DOFX      DOFY      DOFZ     DOFRX     DOFRY     DOFRZ
11         0         0         1         1         0         0         0
\$---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
*NODE
\$
*ELEMENT_SHELL
\$
*ELEMENT_SOLID
\$
*END```