A copper bar strikes a wall.
*CONTROL_ENERGY Bar Impact LS-DYNA Manual Section: *CONTROL_ENERGY Example: Bar Impact Filename: control_energy.bar-impact.k Description: A copper bar strikes a wall. Model: A 1/4 symmetry bar measures 0.32 cm in radius and 3.24 cm in length and contains 972 hexahedron element. The bar starts at 0.0227 cm/ usec and stops at 0 cm/ usec. The calculation illustrates the energy balance where E = KE + IE + HGE. Input: The hour glass energy is computed at a negligible cost. (*CONTROL_ENERGY) The initial velocity for every node is set to -0.0227 except the nodes at z = 0. Results: The undeformed and deformed shape of the bar are shown. The total, kinetic, internal and hourglass energies are also shown.
*CONTROL_ENERGY *CONTROL_HOURGLASS *CONTROL_OUTPUT *CONTROL_TERMINATION *DATABASE_BINARY_D3PLOT *DATABASE_BINARY_D3THDT *DATABASE_GLSTAT *DATABASE_HISTORY_NODE *DATABASE_NODOUT *DEFINE_BOX *ELEMENT_SOLID *END *INITIAL_VELOCITY *KEYWORD *MAT_PLASTIC_KINEMATIC *NODE *PART *SECTION_SOLID *TITLE
*KEYWORD
*TITLE
bar impact
$
$ LSTC Example
$
$ Last Modified: September 12, 1997
$
$ Units: gm, cm, microsec, 1e+07 N, Mbar, 1e+07 N-cm
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$$$$ Control Ouput
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
*CONTROL_TERMINATION
$ endtim endcyc dtmin endneg endmas
82.10
$
*CONTROL_ENERGY
$ hgen rwen slnten rylen
2
$
*CONTROL_HOURGLASS
$ ihq qh
4
$
*CONTROL_OUTPUT
$ npopt neecho nrefup iaccop opifs ipnint ikedit
0 0 0 0 2 1000
$
$
*DATABASE_BINARY_D3PLOT
$ dt lcdt
5.0
$
*DATABASE_BINARY_D3THDT
$ dt lcdt
1.0
$
*DATABASE_GLSTAT
$ dt
0.5
$
*DATABASE_NODOUT
$ dt/cycl lcdt
0.5
$
*DATABASE_HISTORY_NODE
$ id1 id2 id3 id4 id5 id6 id7 id8
1333
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$$$$ Initial Conditions
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
$$$$ Nodes within box 2 are given an initial velocity in the neg z-direction.
$$$$ These are all the nodes except for those on the bottom of the bar.
$
*INITIAL_VELOCITY
$ nsid nsidex boxid
0 0 2
$ vx vy vz vxe vye vze
0.0 0.0 -0.0227 0.0 0.0 0.0
$
*DEFINE_BOX
$ boxid xmm xmx ymn ymx zmn zmx
2 -1.e6 1.e6 -1.e6 1.e6 0.50e-02 1.e6
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$$$$ Define Parts and Materials
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
*PART
$ pid sid mid eosid hgid adpopt
Bar
1 1 1
$
$
*MAT_PLASTIC_KINEMATIC
$ mid ro e pr sigy etan beta
1 8.930 1.17 0.350 0.004 0.001 1.0
$ src srp fs
0.0 0.0 0.0
$
$
*SECTION_SOLID
$ sid elform
1 0
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$$$$ Define Nodes and Elements
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$$$$ Many nodes have boundary conditions to simulate symmetry.
$
$
*END
