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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.
Keywords
*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
Animated Result
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