Shell 2
A cantilever beam has a concentrated load, and then the beam vibration critically damps. Lobatto integration rules place the quadrature points on the true surfaces of the shell. [ See Hughes]. Download is available in the download section of this document.
Introduction
Introduction
This example has been taken from the 'LS-DYNA Examples Manual'. Example name: integration_shell.lobotto.beam.k
A brief description of the example.
*INTEGRATION_SHELL Cantilever Beam with Lobatto Integration LS-DYNA Manual Section: *INTEGRATION_SHELL Additional Sections: *DAMPING_GLOBAL *LOAD_NODE_POINT Example: Cantilever Beam with Lobatto Integration Filename: integration_shell.lobotto.beam.k Description: A cantilever beam has a concentrated load, and then the beam vibration critically damps. Lobatto integration rules place the quadrature points on the true surfaces of the shell. [ See Hughes]. Model: The plate measures 1.00 * 0.10 * 0.01 in 3 and is modeled with 60 Belytschko-Tsay shell elements. The displacement of the nodes is fixed at one end and a concentrated load is applied to the other end. Symmetry conditions for the plane strain case exist on the beam sides. Input: The concentrated loads and load curve definition 1 defines the load on the end of the beam (*LOAD_NODE_POINT, *DEFINE_CURVE). The beam is critically damped (*DAMPING_GLOBAL) The number of integration points is 5 (*SECT ION_SHELL). The shell integration rule is the Lobatto integration rule (*SECTION_SHELL) Results: The displacement of the beam damps out critically. The x-stress values at the integration points exhibit tension on one side, compression on the opposite side, and balance at the neutral axis.
Keywords
Keywords
This example has been taken from the 'LS-DYNA Examples Manual'. Example name: integration_shell.lobotto.beam.k
The used Keywords in alphabetical order.
*CONTROL_ENERGY *CONTROL_OUTPUT *CONTROL_TERMINATION *DAMPING_GLOBAL *DATABASE_BINARY_D3PLOT *DATABASE_BINARY_D3THDT *DATABASE_ELOUT *DATABASE_EXTENT_BINARY *DATABASE_GLSTAT *DATABASE_HISTORY_NODE *DATABASE_HISTORY_SHELL *DATABASE_NODOUT *DEFINE_CURVE *ELEMENT_SHELL *END *INTEGRATION_SHELL *KEYWORD *LOAD_NODE_POINT *MAT_PLASTIC_KINEMATIC *NODE *PART *SECTION_SHELL *TITLE
Reduced Input
Reduced Input
This example has been taken from the 'LS-DYNA Examples Manual'. Example name: integration_shell.lobotto.beam.k
*Node and *Element Cards are removed.
*KEYWORD
*TITLE
Lobotto Integration
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$ LSTC Example
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$ Last Modified: September 17, 1997
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$ Units: lbf-s2/in, in, s, lbf, psi, lbf-in
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$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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$$$$ Control Ouput
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$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
*CONTROL_TERMINATION
$ endtim endcyc dtmin endneg endmas
0.015
$
*CONTROL_ENERGY
$ hgen rwen slnten rylen
2
$
*CONTROL_OUTPUT
$ npopt neecho nrefup iaccop opifs ipnint ikedit
0 0 0 0 2 1000
$
$
*DATABASE_BINARY_D3PLOT
$ dt lcdt
0.0003
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*DATABASE_BINARY_D3THDT
$ dt lcdt
10.
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*DATABASE_EXTENT_BINARY
$ neiph neips maxint strflg sigflg epsflg rltflg engflg
5
$ cmpflg ieverp beamip
$
*DATABASE_GLSTAT
$ dt
0.0001
$
*DATABASE_ELOUT
$ dt
0.0001
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*DATABASE_HISTORY_SHELL
$ id1 id2 id3 id4 id5 id6 id7 id8
1
$
*DATABASE_NODOUT
$ dt
0.0001
$
*DATABASE_HISTORY_NODE
$ id1 id2 id3 id4 id5 id6 id7 id8
31
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$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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$$$$ Loading
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$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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$$$$ Load nodes 31, 62, 93 in the negative z-direction.
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$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
*LOAD_NODE_POINT
$ nid dof lcid sf cid m1 m2 m3
31 3 1 -1.00E+00
62 3 1 -1.00E+00
93 3 1 -1.00E+00
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*DEFINE_CURVE
$ lcid sidr scla sclo offa offo
1
$ a o
0.000E+00 0.000E+00
8.000E-03 1.667E-03
1.534E-02 1.667E-03
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$$$$ Damping
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
*DAMPING_GLOBAL
$ lcid valdmp
2 0.0
$
*DEFINE_CURVE
$ lcid sidr scla sclo offa offo
2
$ a o
0.000E+00 0.000E+00
8.000E-03 0.000E+00
1.000E-02 2.353E+03
1.534E-02 2.353E+03
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$$$$ Define Parts and Materials
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$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
*PART
$ pid sid mid eosid hgid adpopt
Cantilever Beam - Aluminum
1 1 1
$
$
*MAT_PLASTIC_KINEMATIC
$ mid ro e pr sigy etan beta
1 7.85e-4 10.00e+6 0.300 20000.0 100000 1.0
$ src srp fs
0.0 0.0 0.0
$
$$$$ irid = -1 ===> integration rule 1 used (see below)
$
*SECTION_SHELL
$ sid elform shrf nip propt qr/irid icomp
1 0 5 -1
$ t1 t2 t3 t4 nloc
0.010 0.010 0.010 0.010
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$$$$ Integration Rule
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
*INTEGRATION_SHELL
$ irid nip esop
1 5
$ s wf pid
-1.000E+00 1.000E-01
-6.546E-01 5.444E-01
0.000E+00 7.111E-01
6.546E-01 5.444E-01
1.000E+00 1.000E-01
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$$$$ Define Nodes and Elements
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$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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$
*END
Figures
Figures
This example has been taken from the 'LS-DYNA Examples Manual'. Example name: integration_shell.lobotto.beam.k
Animated Result
Animated Result
This example has been taken from the 'LS-DYNA Examples Manual'. Example name: integration_shell.lobotto.beam.k
Download
Download
This example has been taken from the 'LS-DYNA Examples Manual'. Example name: integration_shell.lobotto.beam.k
