Ball

A rubber sphere is modeled with shell elements and Mooney-Rivlin material. It is pressurized using *AIRBAG_SIMPLE_PRESSURE_VOLUME_1 command and afterwards dropped against a rigid plate.

*AIRBAG_SIMPLE_PRESSURE_VOLUME_1
*CONTACT_SURFACE_TO_SURFACE
*CONTROL_CONTACT
*CONTROL_CPU
*CONTROL_DAMPING
*CONTROL_ENERGY
*CONTROL_OUTPUT
*CONTROL_SHELL
*CONTROL_TERMINATION
*CONTROL_TIMESTEP
*DATABASE_ABSTAT
*DATABASE_BINARY_D3PLOT
*DATABASE_BINARY_D3THDT
*DATABASE_EXTENT_BINARY
*DATABASE_GLSTAT
*DEFINE_CURVE
*END
*HOURGLASS
*KEYWORD
*LOAD_BODY_Y
*MAT_MOONEY-RIVLIN_RUBBER
*MAT_RIGID
*PART
*SECTION_SHELL
*SET_PART
*SET_PART_LIST
*TITLE

  *KEYWORD
  $ drop of pressurized (airbag type 1) sphere against rigid plate (jday 1/99)
  $
  $  dynamic relaxation to pressurize the sphere
  $  less pressure = lower frequency response and more flattening against plate
  $
  $  manually added curves for load_body
  *define_curve
  1
  0,1
  100,1
  $  unused curve to trigger dynamic relation 
  *define_curve
  2,1
  0,1
  100,1
  $  end manual additions
  $
  *TITLE
  airfilled.sphere                                                        
  *CONTROL_TERMINATION
   0.8000000         0 0.0000000         0 0.0000000
  *CONTROL_TIMESTEP
   0.0000000 0.9000000         0 0.0000000 0.0000000         0         0         0
  *CONTROL_SHELL
   0.0000000         0         0         0         0         0         0
  *CONTROL_DAMPING
           0 0.0000000 0.0000000 0.0000000 0.0000000         0 0.0000000         0
  *CONTROL_CONTACT
   0.0000000 0.0000000         0         0         0         0         2
           0         0         0         0 0.0000000         0         0         0
  *CONTROL_OUTPUT
           0         0         0         0 0.0000000         0         0
  *CONTROL_ENERGY
           2         2         1         1
  *DATABASE_BINARY_D3PLOT
   0.0200000                   0
  *DATABASE_BINARY_D3THDT
   10.000000
  *DATABASE_EXTENT_BINARY
           0         0         0         0         0         0         0         0
           0         0         0         0         0         0
  *DATABASE_GLSTAT
   0.0200000
  *DATABASE_ABSTAT
   0.0200000
  *CONTROL_CPU
   0.0000000
  *MAT_MOONEY-RIVLIN_RUBBER
           1 1.13000-4 0.4950000 100.00000 10.000000
   0.0000000 0.0000000 0.0000000         0
  *MAT_RIGID
           2 7.00000-4 3.00000+7 0.3000000 0.0000000 0.0000000 0.0000000          
   1.0000000 7.0000000 7.0000000
   0.0000000 0.0000000 0.0000000 0.0000000 0.0000000 0.0000000 0.0000000 0.0000000
  *SECTION_SHELL
           1         0 0.0000000 0.0000000 0.0000000 0.0000000         0
   0.2000000 0.2000000 0.2000000 0.2000000 0.0000000
  *SECTION_SHELL
           2         0 0.0000000 0.0000000 0.0000000 0.0000000         0
   0.1000000 0.1000000 0.1000000 0.1000000 0.0000000
  *HOURGLASS
           1         2 0.1000000         0 0.0000000 0.0000000
  *PART
   
           1         1         1         0         1         0         0         0
  *PART
   
           2         2         2         0         0         0         0         0
  $
  $ add nodes and elements
  $
  $ INTERFACE NAME: 1          $$$
  *CONTACT_SURFACE_TO_SURFACE                      
           1         2         2         2         0         0         0         0
   0.0000000 0.0000000 0.0000000 0.0000000 0.0000000         0 0.0000000 0.0000000
   0.1000000 0.1000000 0.0000000 0.0000000 0.0000000 0.0000000
  *SET_PART
           1
           1
  *SET_PART
           2
           2
  *LOAD_BODY_Y
  $ note that dynamic relax curve = 0 does NOT mean use transient lcurve for DR
           1 386.00000         0
  *AIRBAG_SIMPLE_PRESSURE_VOLUME_1
           3         1         0 0.0000000 0.0000000 0.0000000 150.00000 0.0000000
   3.0000000 1.0000000
  *SET_PART_LIST
           3
           1
  *END