Material Nonlinearity

This example shows the deformation of a rubber bar to element failure and then complete release of the bar due to additional element failure. Nonlinear Example 1 from A Roadmap to Linear an Nonlinear Implicit Analysis in LS-DYNA by George Laird and Satish Pathy.

*BOUNDARY_PRESCRIBED_MOTION_NODE
*BOUNDARY_SPC_NODE
*CONTROL_ACCURACY
*CONTROL_IMPLICIT_AUTO
*CONTROL_IMPLICIT_DYNAMICS
*CONTROL_IMPLICIT_GENERAL
*CONTROL_IMPLICIT_SOLUTION
*CONTROL_OUTPUT
*CONTROL_TERMINATION
*DATABASE_BINARY_D3PLOT
*DATABASE_EXTENT_BINARY
*DATABASE_GLSTAT
*DATABASE_MATSUM
*DATABASE_SPCFORC
*DEFINE_CURVE_TITLE
*ELEMENT_SOLID (ten nodes format)
*END
*KEYWORD
*MAT_ADD_EROSION_TITLE
*MAT_SIMPLIFIED_RUBBER/FOAM_TITLE
*NODE
*PART
*SECTION_SOLID_TITLE
*TITLE

*KEYWORD
*TITLE
Roadmap Linear and Nonlinear Analyses - Material Nonlinearity
*CONTROL_ACCURACY
                                       1
*CONTROL_IMPLICIT_AUTO
         1                                      -5    
*CONTROL_IMPLICIT_DYNAMICS
         1       0.6      0.38     
*CONTROL_IMPLICIT_GENERAL
         1      0.01         
*CONTROL_IMPLICIT_SOLUTION
        
                                       2  
        
         
*CONTROL_OUTPUT
         
        
                                                 2  
        
*CONTROL_TERMINATION
       1.0         
*DATABASE_GLSTAT
    1.0E-3         3   
*DATABASE_MATSUM
    1.0E-3         3        
*DATABASE_SPCFORC
    1.0E-3         3  
*DATABASE_BINARY_D3PLOT
      0.01        
     
*DATABASE_EXTENT_BINARY
         0         0         3         0         1         1         1         1
         
         8                             
         
*PART
         1         1         1         0         0         0         0         0
*SECTION_SOLID_TITLE
Block
         1        16        
*DEFINE_CURVE_TITLE
Push
         1         0       1.0       1.0       0.0       0.0         0         0
*DEFINE_CURVE_TITLE
Silicone Rubber Dow EE3200 (lbf-in-s) (Smoothed)
         2         0       1.0       1.0       0.0       0.0         0         0
*ELEMENT_SOLID (ten nodes format)
*MAT_ADD_EROSION_TITLE
Tensile/Failure Criterion
         1       0.0       0.0       0.0       0.0       0.0       1.0       1.0
       0.0       0.0       0.0       0.5       0.0       0.0       0.0       0.0
         0       0.0         0       0.0       1.0       0.0       1.0         0
         0         0       0.0       0.0       0.0
*MAT_SIMPLIFIED_RUBBER/FOAM_TITLE
6061-T6
         11.00000E-4  100000.0       0.0       0.0       0.0       0.0       0.0
       1.0       1.0       1.0         2       0.0       0.0       0.0       0.0
*NODE
*BOUNDARY_PRESCRIBED_MOTION_NODE
*BOUNDARY_SPC_NODE
*END