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