Moving
A tube is crushed using a planar, moving rigid wall.
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Moving
A tube is crushed using a planar, moving rigid wall.
*RIGIDWALL_PLANAR_MOVING Symmetric Crush Tube LS-DYNA Manual Section: *RIGIDWALL_PLANAR_MOVING Additional Sections: *CONTACT_AUTOMATIC_SINGLE_SURFACE Example: Symmetric Crush Tube Filename: rigidwall_planar.symtube.k Description: A tube is crushed using a planar, moving rigid wall. Model: Because of symmetry ,only 1/4 of the system is modeled. Automatic single surface contact is defined to prevent penetrations as the tube folds on itself. The bottom nodes of the tube are fixed using SPC's. The top of the tube is hit by a rigidwall that is defined with a mass of 800 kg and an initial velocity of 8.94 mm/ms in the negative z-direction. The friction coefficient on the wall is 1.0, this means that the nodes are prevented from sliding along the plane of the wall. An extra node is defined and associated with the rigid wall so that the walls velocity and displacement can be tracked in the ascii output file nodout (node id 99999). Results: The tubes crush and the wall forces from the ascii output file rwforc are shown. The force deflection of the crush tube can be obtained by using the force data from rwforc and the displacement data from nodout.
*BOUNDARY_SPC_NODE *CONTACT_AUTOMATIC_SINGLE_SURFACE *CONTROL_ENERGY *CONTROL_OUTPUT *CONTROL_TERMINATION *DATABASE_BINARY_D3PLOT *DATABASE_BINARY_D3THDT *DATABASE_EXTENT_BINARY *DATABASE_GLSTAT *DATABASE_HISTORY_NODE *DATABASE_MATSUM *DATABASE_NODOUT *DATABASE_RWFORC *DATABASE_SLEOUT *ELEMENT_SHELL *END *KEYWORD *MAT_PIECEWISE_LINEAR_PLASTICITY *NODE *PART *RIGIDWALL_PLANAR_MOVING_FORCES *SECTION_SHELL *TITLE
*KEYWORD
*TITLE
Symmetric Short Crush Tube Impacted by a Moving Wall
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$ LSTC Example
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$ Last Modified: October 10, 1997
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$ Symmetric model - 1/4 of the tube
$ - Remove corner elements on desired initial crush area (2 shells)
$ shells commented out: 409, 410
$
$ Units: mm, kg, ms, kN, GPa, kN-mm
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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$$$$ Control Ouput
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$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
*CONTROL_TERMINATION
$ endtim endcyc dtmin endneg endmas
15.01 0 0.0 0.0 0.0
$
*CONTROL_ENERGY
$ hgen rwen slnten rylen
2 2 2
$
*CONTROL_OUTPUT
$ npopt neecho nrefup iaccop opifs ipnint ikedit
1 3
$
$
*DATABASE_BINARY_D3PLOT
$ dt lcdt
1.0
$
*DATABASE_EXTENT_BINARY
$ neiph neips maxint strflg sigflg epsflg rltflg engflg
$ cmpflg ieverp beamip
1
$
*DATABASE_BINARY_D3THDT
$ dt lcdt
999999
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*DATABASE_GLSTAT
$ dt
0.1
$
*DATABASE_MATSUM
$ dt
0.1
$
*DATABASE_NODOUT
$ dt
0.1
$
*DATABASE_HISTORY_NODE
$ id1 id2 id3 id4 id5 id6 id7 id8
99999 414 486
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*DATABASE_RWFORC
$ dt
0.1
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*DATABASE_SLEOUT
$ dt
0.1
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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$$$$ Define Contacts - Sliding Interfaces
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$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
*CONTACT_AUTOMATIC_SINGLE_SURFACE
$ ssid msid sstyp mstyp sboxid mboxid spr mpr
0
$ Equating ssid to zero means that all segments are included in the contact
$
$ fs fd dc vc vdc penchk bt dt
0.08 0.08
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$ sfs sfm sst mst sfst sfmt fsf vsf
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$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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$$$$ Define Rigidwalls
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$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
*RIGIDWALL_PLANAR_MOVING_FORCES
$ nsid nsidex boxid
0 0 0
$
$ xt yt zt xh yh zh fric
0.0 0.0 274.0 0.0 0.0 0.0 1.0
$
$ sw mass sw vel
800.000 8.94000
$
$ soft ssid node1 node2 node3 node4
0 0 99999
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$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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$$$$ Define Parts and Materials
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$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
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*PART
$ pid sid mid eosid hgid grav adpopt
corner1
1 1 1
$
$
*MAT_PIECEWISE_LINEAR_PLASTICITY
$ mid ro e pr sigy etan eppf tdel
1 7.830E-06 200.0 0.3 0.207 0.750
$
$ c p lcss lcsr
40 5
$ PLASTIC STRESS/STRAIN CURVES
$ eps1 eps2 eps3 eps4 eps5 eps6 eps7 eps8
0.000 0.080 0.160 0.400 0.750
$ es1 es2 es3 es4 es5 es6 es7 es8
0.207 0.250 0.275 0.290 0.300
$
$
*SECTION_SHELL
$ sid elform shrf nip propt qr/irid icomp
1 2 3.0000
$ t1 t2 t3 t4 nloc
2.00 2.00 2.00 2.00
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$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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$$$$ Define Constraints and Boundary
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$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
$ Nodal single point constraints (SPC's)
$ - fix on bottom of tube
$ - symmetry along both sides of tube
$
*BOUNDARY_SPC_NODE
$ nid cid x y z rx ry rz
1, 0,1,1,1, 1, 1, 1
2, 0,1,1,1, 1, 1, 1
3, 0,1,1,1, 1, 1, 1
4, 0,1,1,1, 1, 1, 1
5, 0,1,1,1, 1, 1, 1
6, 0,1,1,1, 1, 1, 1
7, 0,1,1,1, 1, 1, 1
414, 0,1,1,1, 1, 1, 1
415, 0,1,1,1, 1, 1, 1
532, 0,1,1,1, 1, 1, 1
533, 0,1,1,1, 1, 1, 1
534, 0,1,1,1, 1, 1, 1
535, 0,1,1,1, 1, 1, 1
536, 0,1,1,1, 1, 1, 1
537, 0,0,1,0, 1, 0, 1
542, 0,0,1,0, 1, 0, 1
547, 0,0,1,0, 1, 0, 1
552, 0,0,1,0, 1, 0, 1
557, 0,0,1,0, 1, 0, 1
562, 0,0,1,0, 1, 0, 1
567, 0,0,1,0, 1, 0, 1
572, 0,0,1,0, 1, 0, 1
577, 0,0,1,0, 1, 0, 1
582, 0,0,1,0, 1, 0, 1
587, 0,0,1,0, 1, 0, 1
592, 0,0,1,0, 1, 0, 1
597, 0,0,1,0, 1, 0, 1
602, 0,0,1,0, 1, 0, 1
607, 0,0,1,0, 1, 0, 1
612, 0,0,1,0, 1, 0, 1
617, 0,0,1,0, 1, 0, 1
622, 0,0,1,0, 1, 0, 1
627, 0,0,1,0, 1, 0, 1
632, 0,0,1,0, 1, 0, 1
637, 0,0,1,0, 1, 0, 1
642, 0,0,1,0, 1, 0, 1
647, 0,0,1,0, 1, 0, 1
652, 0,0,1,0, 1, 0, 1
657, 0,0,1,0, 1, 0, 1
662, 0,0,1,0, 1, 0, 1
667, 0,0,1,0, 1, 0, 1
672, 0,0,1,0, 1, 0, 1
677, 0,0,1,0, 1, 0, 1
682, 0,0,1,0, 1, 0, 1
687, 0,0,1,0, 1, 0, 1
692, 0,0,1,0, 1, 0, 1
697, 0,0,1,0, 1, 0, 1
702, 0,0,1,0, 1, 0, 1
707, 0,0,1,0, 1, 0, 1
712, 0,0,1,0, 1, 0, 1
14, 0,1,0,0, 0, 1, 1
21, 0,1,0,0, 0, 1, 1
28, 0,1,0,0, 0, 1, 1
35, 0,1,0,0, 0, 1, 1
42, 0,1,0,0, 0, 1, 1
49, 0,1,0,0, 0, 1, 1
56, 0,1,0,0, 0, 1, 1
63, 0,1,0,0, 0, 1, 1
70, 0,1,0,0, 0, 1, 1
77, 0,1,0,0, 0, 1, 1
84, 0,1,0,0, 0, 1, 1
91, 0,1,0,0, 0, 1, 1
98, 0,1,0,0, 0, 1, 1
105, 0,1,0,0, 0, 1, 1
112, 0,1,0,0, 0, 1, 1
119, 0,1,0,0, 0, 1, 1
126, 0,1,0,0, 0, 1, 1
133, 0,1,0,0, 0, 1, 1
140, 0,1,0,0, 0, 1, 1
147, 0,1,0,0, 0, 1, 1
154, 0,1,0,0, 0, 1, 1
161, 0,1,0,0, 0, 1, 1
168, 0,1,0,0, 0, 1, 1
175, 0,1,0,0, 0, 1, 1
182, 0,1,0,0, 0, 1, 1
189, 0,1,0,0, 0, 1, 1
196, 0,1,0,0, 0, 1, 1
203, 0,1,0,0, 0, 1, 1
210, 0,1,0,0, 0, 1, 1
217, 0,1,0,0, 0, 1, 1
224, 0,1,0,0, 0, 1, 1
231, 0,1,0,0, 0, 1, 1
238, 0,1,0,0, 0, 1, 1
245, 0,1,0,0, 0, 1, 1
252, 0,1,0,0, 0, 1, 1
259, 0,1,0,0, 0, 1, 1
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$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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$$$$ Define Nodes and Elements
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$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
$
*END