A beam twisted 90 degrees about its length is constrained on on e edge and has a point load prescribed normal to the opposite end of the beam.
*CONTROL_SHELL Twisted Cantilever Beam LS-DYNA Manual Section: *CONTROL_SHELL Example: Twisted Cantilever Beam Filename: control_shell.beam-twist.k Description: A beam twisted 90 degrees about its length is constrained on on e edge and has a point load prescribed normal to the opposite end of the beam. Model: The beam measures 12.00 * 1.10 * 0.32 cubic inches. A concentrated load is applied to one node on the end in the x-direction and the other node on the end in the z-direction. Input: This model uses the Hughes-Liu five through the thickness integration points (*CONTROL_SHELL, *SECTI ON_SHELL). The element has the shell normal update calculation performed at each nodal fiber every cycle (*CONTROL_SHELL). Note: This is another example that will not work correctly with the B-T shell formulation (unless warping stiffness is added). Results: The beam oscillates about a neutral amplitude. Reference: Belytschko, Wang and Chiang.
*CONTROL_OUTPUT *CONTROL_SHELL *CONTROL_TERMINATION *DATABASE_BINARY_D3PLOT *DATABASE_BINARY_D3THDT *DATABASE_BNDOUT *DATABASE_EXTENT_BINARY *DATABASE_GLSTAT *DATABASE_HISTORY_NODE *DATABASE_NODOUT *DEFINE_CURVE *ELEMENT_SHELL *END *KEYWORD *LOAD_NODE_POINT *MAT_ELASTIC *NODE *PART *SECTION_SHELL *TITLE
*KEYWORD
*TITLE
Twisted Beam
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$ LSTC Example
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$ Last Modified: September 15, 1997
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$ Units: lbf-s2/in, in, s, lbf, psi, lbf-in
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$$$$ Control Ouput
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$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
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*CONTROL_TERMINATION
$ endtim endcyc dtmin endneg endmas
0.018
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*CONTROL_OUTPUT
$ npopt neecho nrefup iaccop opifs ipnint ikedit
0 0 0 0 2 1000
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*CONTROL_SHELL
$ wrpang itrist irnxx istupd theory bwc miter
-2 1
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*DATABASE_EXTENT_BINARY
$ neiph neips maxint strflg sigflg epsflg rltflg engflg
4
$ cmpflg ieverp beamip
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*DATABASE_BINARY_D3PLOT
$ dt lcdt
0.001
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*DATABASE_BINARY_D3THDT
$ dt lcdt
0.0001
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*DATABASE_BNDOUT
$ dt
0.0001
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*DATABASE_GLSTAT
$ dt
0.0001
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*DATABASE_NODOUT
$ dt
0.0001
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*DATABASE_HISTORY_NODE
$ id1 id2 id3 id4 id5 id6 id7 id8
37
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$$$$ Loading
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$$$$ Load node 37, 38, 39 with 0.1667 lbs in both x and y direction.
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$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
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*LOAD_NODE_POINT
$ nid dof lcid sf cid m1 m2 m3
37 1 1 1.667E-01
38 1 1 1.667E-01
39 1 1 1.667E-01
37 2 1 1.667E-01
38 2 1 1.667E-01
39 2 1 1.667E-01
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*DEFINE_CURVE
$ lcid sidr scla sclo offa offo
1
$ a o
0.000E+00 1.000E+00
1.000E+03 1.000E+00
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$$$$ Define Parts and Materials
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$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
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*PART
$ pid sid mid eosid hgid adpopt
Twisted Beam
1 1 1
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*MAT_ELASTIC
$ mid ro e pr da db
1 2.00e-4 29.00e+6 0.330
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*SECTION_SHELL
$ sid elform shrf nip propt qr/irid icomp
1 0 4 0
$ t1 t2 t3 t4 nloc
0.320 0.320 0.320 0.320
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$$$$ Define Nodes and Elements
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$$$$ Nodes 1, 2, 3 have fixed boundary conditions.
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*END
