Reduced Input
*Node and *Element Cards are removed.
*KEYWORD
*TITLE
Foam Material Model for a Single Element
$
$ LSTC Example
$
$ Last Modified: September 18, 1997
$
$ This problem contains a single element with one degree of
$ freedom on a single side. The element compresses and expands
$ following a prescribed velocity motion.
$
$ The material is a foam which follows a pressure volumetric
$ strain relationship. The foam block is compressed and
$ expanded in a range of relative volume (V/Vo) from 1.0
$ to 0.0091 to 1.441.
$
$ Two types of unloading are explored:
$ 1. Unloading follows the loading curve
$ 2. Bulk unloading modulus is used - volumetric crushing
$
$ The foam has a tensile fracture pressure cutoff of 0.5
$
$ Units: lbf-s2/in, in, s, lbf, psi, lbf-in
$
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$
$$$$ Control Ouput
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
*CONTROL_TERMINATION
$ endtim endcyc dtmin endneg endmas
0.250
$
*CONTROL_ENERGY
$ hgen rwen slnten rylen
2 2
$
$
*DATABASE_BINARY_D3PLOT
$ dt/cycl lcdt
0.005
$
*DATABASE_BINARY_D3THDT
$ dt/cycl lcdt
0.001
$
*DATABASE_GLSTAT
$ dt/cycl lcdt
0.005
$
*DATABASE_ELOUT
$ dt/cycl lcdt
0.005
$
*DATABASE_HISTORY_SOLID
1
$
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$
$$$$ Boundary Motion Conditions
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$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
*BOUNDARY_PRESCRIBED_MOTION_SET
$ nid dof vad lcid sf vid
1 3 0 1 1.0 0
$
*DEFINE_CURVE
$ lcid sidr scla sclo offa offo
1
$ abscissa ordinate
0.000E+00 -9.000E+02
1.000E-01 -9.000E+02
1.010E-01 9.000E+02
2.500E-01 9.000E+02
$
*SET_NODE_LIST
$ sid
1
$ nid1 nid2 nid3 nid4 nid5 nid6 nid7 nid8
5 6 7 8
$
$
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$
$$$$ Define Parts and Materials
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$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
*PART
$ pid sid mid eosid hgid adpopt
foam block
1 1 1
$
$
*MAT_SOIL_AND_FOAM
$ mid ro g bulk a0 a1 a2 pc
1 6.740E-11 5.760E+01 1.794E+01 1.200E-01 0.000E+00 0.000E+00-5.000E-01
$ f f
$ vcr dun
$
$ Unloading follows the loading curve
$ 1.000E+00 0.000E+00
$
$ Bulk unloading modulus is used - volumetric crushing
0.000E+00 0.000E+00
$
$ eps1 eps2 eps3 eps4 eps5 eps6 eps7 eps8
-2.500E-02-5.000E-02-1.050E-01-3.570E-01-6.930E-01-9.160E-01-1.200E+00-1.610E+00
$
$ eps9 eps10
0.000E+00 0.000E+00
$
$ p1 p2 p3 p4 p5 p6 p7 p8
3.450E-01 5.170E-01 6.890E-01 8.070E-01 1.110E+00 1.240E+00 1.300E+00 1.500E+00
$
$ p9 p10
0.000E+00 0.000E+00
$
$
*SECTION_SOLID
$ sid elform
1
$
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$
$$$$ Define Nodes and Elements
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$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
$
*END