Bar I — Welcome to LS-DYNA Examples

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This example shows the deformation of two equivalent bars made of plastic material. Initial conditions are specified by *INITIAL_VELOCITY keyword. The upper bar is calculated using Lagrangian discretization, the lower one is calculated using SPH method.

Keywords

*BOUNDARY_SPC_SET
*CONTROL_CONTACT
*CONTROL_DAMPING
*CONTROL_ENERGY
*CONTROL_OUTPUT
*CONTROL_SHELL
*CONTROL_SPH
*CONTROL_TERMINATION
*CONTROL_TIMESTEP
*DATABASE_BINARY_D3PLOT
*DATABASE_EXTENT_BINARY
*DATABASE_GLSTAT
*DATABASE_MATSUM
*ELEMENT_SOLID
*ELEMENT_SPH
*END
*INITIAL_VELOCITY
*INITIAL_VELOCITY_NODE
*KEYWORD
*MAT_PLASTIC_KINEMATIC
*NODE
*PART
*SECTION_SOLID
*SECTION_SPH
*SET_NODE_LIST_GENERATE
*TITLE

Reduced Input

  *KEYWORD
  $* LS-DYNA Keyword file: LSTC LS-PRE/POST Ver 1.0(Beta)- 31OCT2002(1553)
  $* Total Number of Nodes  =    10652,Largest node ID  = 2002700
  $* Total Number of Solids =     2500,Largest Solid ID = 2500
  $* Total Number of Parts  =        4,Largest Part ID  = 102
  $* Total Number of Mats   =        1 Largest Mat ID   = 1
  *TITLE
  $
  $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
  $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
  $
  $$$$   NODES AND ELEMENTS
  $
  $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
  $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
  $
  Untitled                                                                        
  *CONTROL_CONTACT
  $*  slsfac    rwpnal    islchk    shlthk    penopt    thkchg     orien    enmass
         0.0       0.0
  $*  usrstr    usrfrc     nsbcs    interm     xpene     ssthk      ecdt   tiedprj
           0         0         0         0       0.0
  *CONTROL_DAMPING
  $*  nrcyck     drtol    drfctr    drterm    tssfdr    irelal     edttl    idrflg
           0       0.0       0.0       0.0       0.0         0       0.0
  *CONTROL_ENERGY
  $*    hgen      rwen    slnten     rylen     
           1         2         1         1
  *CONTROL_OUTPUT
  $*   npopt    neecho    nrefup    iaccop     opifs    ipnint    ikedit    iflush
           0         0         0         0       0.0
  *CONTROL_SHELL
  $*  wrpang     esort     irnxx    istupd    theory       bwc     miter      proj
         0.0         0         0         0         9
  *CONTROL_SPH
  $
  $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$   *CONTROL_SPH  $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
  $
  $*    ncbs     boxid        dt       dim    memory      form     start      maxv
           1         0       0.0         2         0         0       0.0       0.0
  *CONTROL_TERMINATION
  $*  endtim    endcyc     dtmin    endeng    endmas    
    20.00000         0       0.0       0.0       0.0
  *CONTROL_TIMESTEP
  $*  dtinit    tssfac      isdo    tslimt     dt2ms      lctm     erode     ms1st
         0.0  0.500000         0       0.0       0.0
  *DATABASE_GLSTAT
    0.001000
  *DATABASE_MATSUM
    0.001000
  *DATABASE_BINARY_D3PLOT
    0.400000
  *DATABASE_EXTENT_BINARY
           0         0         0         0         0         0         0         0
           0         0         0         0         0         0         0
  *ELEMENT_SOLID
  $
  $ ELEMENT CARDS FOR SOLID ELEMENTS 
  $
  *ELEMENT_SPH
  $
  *NODE
  $
  *INITIAL_VELOCITY_NODE
  $
  *INITIAL_VELOCITY
  $
  $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
  $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
  $
  $$$$     INITIAL CONDITION
  $
  $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
  $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
  $
           1
    0.010000       0.0       0.0       0.0       0.0       0.0
           2
   -0.010000       0.0       0.0       0.0       0.0       0.0
         101
    0.010000       0.0       0.0       0.0       0.0       0.0
         102
   -0.010000       0.0       0.0       0.0       0.0       0.0
  *BOUNDARY_SPC_SET
  $
  $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
  $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
  $
  $$$$    
  $
  $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
  $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
  $
           4         0         0         0         1         0         0         1
  *PART
  $* title                                                                        
                                                                                  
  $*     pid     secid       mid     eosid      hgid      grav    adpopt      tmid
           1         1         1
  *SECTION_SOLID
  $*   secid    elform       aet       
           1         1
  *MAT_PLASTIC_KINEMATIC
  $*     mid        ro         e        pr      sigy      etan      beta      
           1  2.700000  0.165600  0.330000  0.002900       0.0       0.0
  $*     src       srp        fs        vp        
         0.0       0.0       0.0       0.0
  *PART
  $* title                                                                        
                                                                                  
  $*     pid     secid       mid     eosid      hgid      grav    adpopt      tmid
           2         1         1
  *PART
  $
  $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ SPH PART    $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
  $
  $* title                                                                        
  material type #101                                                              
  $*     pid     secid       mid     eosid      hgid      grav    adpopt      tmid
         101       101         1
  *SECTION_SPH
  $
  $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$   *SECTION_SPH $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
  $
  $*   secid      cslh      hmin      hmax    sphini     death     start     
         101  1.100000       0.0       0.0       0.0       0.0       0.0
  *PART
  $* title                                                                        
  material type #102                                                              
  $*     pid     secid       mid     eosid      hgid      grav    adpopt      tmid
         102       102         1
  *SECTION_SPH
  $*   secid      cslh      hmin      hmax    sphini     death     start     
         102  1.100000       0.0       0.0       0.0       0.0       0.0
  *SET_NODE_LIST_GENERATE
           1       0.0       0.0       0.0       0.0
           1      2652
  *SET_NODE_LIST_GENERATE
           2       0.0       0.0       0.0       0.0
        2653      5304
  *SET_NODE_LIST_GENERATE
           4       0.0       0.0       0.0       0.0
           1      5304
  *SET_NODE_LIST_GENERATE
         101       0.0       0.0       0.0       0.0
     1000001   1002700
  *SET_NODE_LIST_GENERATE
         102       0.0       0.0       0.0       0.0
     2000001   2002700
  *END

Figures

image01.gif

image02.gif

Animated Result

Result

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