Several nodes on a cylinder are given initial velocities towards the center of the cylinder causing the cylinder to indent. To improve accuracy, adaptivity is defined so that the mesh of the cylinder is re-fined during the deformation.
*CONTROL_ADAPTIVE Cylinder Undergoing Deformation with Adaptivity LS-DYNA Manual Section: *CONTROL_ADAPTIVE Additional Sections: *DEFINE_COORDINATE_VECTOR Example: Cylinder Undergoing Deformation with Adaptivity Filename: control_adaptive.cylinder.k Description: Several nodes on a cylinder are given initial velocities towards the center of the cylinder causing the cylinder to indent. To improve accuracy, adaptivity is defined so that the mesh of the cylinder is re-fined during the deformation. Model: Only 1/4 of the system is modeled becaus e of symmetry. The boundary conditions on the cylinder are defined with single point constraints (SPC's). Because of the geometry orientation, several of the SPC's require local coordinate system defined using the keyword *DEFINE_COORDINATE_VECTOR. Results: Before and after mesh refinement are shown in the figures. Additionally, the total, kinetic and internal energy from the glstat ascii file are shown. The entire initial kinetic energy is absorbed by the cylinder due to material deformation (internal energy).
*BOUNDARY_SPC *CONTROL_ADAPTIVE *CONTROL_ENERGY *CONTROL_OUTPUT *CONTROL_SHELL *CONTROL_TERMINATION *DATABASE_BINARY_D3PLOT *DATABASE_GLSTAT *DATABASE_MATSUM *DEFINE_COORDINATE_VECTOR *ELEMENT_SHELL *END *INITIAL_VELOCITY_NODE *KEYWORD *MAT_PLASTIC_KINEMATIC *NODE *PART *SECTION_SHELL *TITLE
*KEYWORD
*TITLE
ADAPTIVITY: circular cylinder (8x16)
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$ LSTC Example
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$ Last Modified: October 14, 1997
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$ Units: lbf-s2/in, in, s, lbf, psi, lbf-in
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$$$$ Control Ouput
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$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
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*CONTROL_TERMINATION
$ endtim endcyc dtmin endeng endmas
0.0004
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*CONTROL_ENERGY
$ hgen rwen slnten rylen
2 2
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*CONTROL_OUTPUT
$ npopt neecho nrefup iaccop opifs ipnint ikedit
1 3
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*CONTROL_SHELL
$ wrpang itrist irnxx istupd theory bwc miter
1 2 1
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*DATABASE_BINARY_D3PLOT
$ dt lcdt
0.00002
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*DATABASE_GLSTAT
$ dt
0.00002
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*DATABASE_MATSUM
$ dt
0.00002
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$$$$ Adaptivity
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$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
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*CONTROL_ADAPTIVE
$ adpfreq adptol adpopt maxlvl tbirth tdeath lcadp ioflag
1.01e-5 10.0 2 3 0.0 0.0 0 1
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$$$$ Define Parts and Materials
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$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
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*PART
$ pid sid mid eosid hgid grav adpopt
al6061-t6
1 1 1 0 0 0 1
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*MAT_PLASTIC_KINEMATIC
$ mid ro e pr sigy etan beta
1 2.500E-04 1.050E+07 3.300E-01 4.400E+04 0.000E+00 1.000E+00
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$ src srp fs
0.000E+00 0.000E+00
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*SECTION_SHELL
$ sid elform shrf nip propt qr/irid icomp
1 2 1. 5. 0. 0. 0
$ t1 t2 t3 t4 nloc
0.125 0.125 0.125 0.125
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$$$$ Boundary Conditions
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$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
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*BOUNDARY_SPC
$ nid cid dofx dofy dofz dofrx dofry dofrz
1 1 1 1 0 0 1 1
2 1 1 0 0 0 1 1
3 1 1 0 0 0 1 1
4 1 1 0 0 0 1 1
5 1 1 0 0 0 1 1
6 1 1 0 0 0 1 1
7 1 1 0 0 0 1 1
8 1 1 0 0 0 1 1
9 1 1 0 0 0 1 1
10 1 1 0 0 0 1 1
11 1 1 0 0 0 1 1
12 1 1 0 0 0 1 1
13 1 1 0 0 0 1 1
14 1 1 0 0 0 1 1
15 1 1 0 0 0 1 1
16 1 1 0 0 0 1 1
17 1 1 1 0 0 1 1
18 2 0 1 0 0 1 1
34 2 1 1 0 0 1 1
35 3 0 1 0 0 1 1
51 3 1 1 0 0 1 1
52 4 0 1 0 0 1 1
68 4 1 1 0 0 1 1
69 5 0 1 0 0 1 1
85 5 1 1 0 0 1 1
86 6 0 1 0 0 1 1
102 6 1 1 0 0 1 1
103 7 0 1 0 0 1 1
119 7 1 1 0 0 1 1
120 8 0 1 0 0 1 1
136 8 1 1 0 0 1 1
137 1 1 1 1 1 1 1
138 1 1 1 1 1 1 1
139 1 1 1 1 1 1 1
140 1 1 1 1 1 1 1
141 1 1 1 1 1 1 1
142 1 1 1 1 1 1 1
143 1 1 1 1 1 1 1
144 1 1 1 1 1 1 1
145 1 1 1 1 1 1 1
146 1 1 1 1 1 1 1
147 1 1 1 1 1 1 1
148 1 1 1 1 1 1 1
149 1 1 1 1 1 1 1
150 1 1 1 1 1 1 1
151 1 1 1 1 1 1 1
152 1 1 1 1 1 1 1
153 1 1 1 1 1 1 1
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*DEFINE_COORDINATE_VECTOR
$ cid xx yx zx xv yv zv
1 1. 0. 0. 0. 1. 0.
2 0.99144 -0.13053 0.00000 0.13053 0.99144 0.00000
3 0.96593 -0.25882 0.00000 0.25882 0.96593 0.00000
4 0.92388 -0.38268 0.00000 0.38268 0.92388 0.00000
5 0.86603 -0.50000 0.00000 0.50000 0.86603 0.00000
6 0.79335 -0.60876 0.00000 0.60876 0.79335 0.00000
7 0.70711 -0.70711 0.00000 0.70711 0.70711 0.00000
8 0.60876 -0.79335 0.00000 0.79335 0.60876 0.00000
9 0.50000 -0.86603 0.00000 0.86603 0.50000 0.00000
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$$$$ Initial Conditions
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$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
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*INITIAL_VELOCITY_NODE
$ nid vx vy vz vxr vyr vzr
2 0.00 -5650.00 0.00 0.00 0.00 0.00
3 0.00 -5650.00 0.00 0.00 0.00 0.00
4 0.00 -5650.00 0.00 0.00 0.00 0.00
5 0.00 -5650.00 0.00 0.00 0.00 0.00
6 0.00 -5650.00 0.00 0.00 0.00 0.00
7 0.00 -5650.00 0.00 0.00 0.00 0.00
8 0.00 -5650.00 0.00 0.00 0.00 0.00
9 0.00 -5650.00 0.00 0.00 0.00 0.00
10 0.00 -5650.00 0.00 0.00 0.00 0.00
11 0.00 -5650.00 0.00 0.00 0.00 0.00
12 0.00 -5650.00 0.00 0.00 0.00 0.00
13 0.00 -5650.00 0.00 0.00 0.00 0.00
14 0.00 -5650.00 0.00 0.00 0.00 0.00
19 -737.47 -5601.66 0.00 0.00 0.00 0.00
20 -737.47 -5601.66 0.00 0.00 0.00 0.00
21 -737.47 -5601.66 0.00 0.00 0.00 0.00
22 -737.47 -5601.66 0.00 0.00 0.00 0.00
23 -737.47 -5601.66 0.00 0.00 0.00 0.00
24 -737.47 -5601.66 0.00 0.00 0.00 0.00
25 -737.47 -5601.66 0.00 0.00 0.00 0.00
26 -737.47 -5601.66 0.00 0.00 0.00 0.00
27 -737.47 -5601.66 0.00 0.00 0.00 0.00
28 -737.47 -5601.66 0.00 0.00 0.00 0.00
29 -737.47 -5601.66 0.00 0.00 0.00 0.00
30 -737.47 -5601.66 0.00 0.00 0.00 0.00
31 -737.47 -5601.66 0.00 0.00 0.00 0.00
36 -1462.33 -5457.48 0.00 0.00 0.00 0.00
37 -1462.33 -5457.48 0.00 0.00 0.00 0.00
38 -1462.33 -5457.48 0.00 0.00 0.00 0.00
39 -1462.33 -5457.48 0.00 0.00 0.00 0.00
40 -1462.33 -5457.48 0.00 0.00 0.00 0.00
41 -1462.33 -5457.48 0.00 0.00 0.00 0.00
42 -1462.33 -5457.48 0.00 0.00 0.00 0.00
43 -1462.33 -5457.48 0.00 0.00 0.00 0.00
44 -1462.33 -5457.48 0.00 0.00 0.00 0.00
45 -1462.33 -5457.48 0.00 0.00 0.00 0.00
46 -1462.33 -5457.48 0.00 0.00 0.00 0.00
47 -1462.33 -5457.48 0.00 0.00 0.00 0.00
48 -1462.33 -5457.48 0.00 0.00 0.00 0.00
53 -2162.16 -5219.92 0.00 0.00 0.00 0.00
54 -2162.16 -5219.92 0.00 0.00 0.00 0.00
55 -2162.16 -5219.92 0.00 0.00 0.00 0.00
56 -2162.16 -5219.92 0.00 0.00 0.00 0.00
57 -2162.16 -5219.92 0.00 0.00 0.00 0.00
58 -2162.16 -5219.92 0.00 0.00 0.00 0.00
59 -2162.16 -5219.92 0.00 0.00 0.00 0.00
60 -2162.16 -5219.92 0.00 0.00 0.00 0.00
61 -2162.16 -5219.92 0.00 0.00 0.00 0.00
62 -2162.16 -5219.92 0.00 0.00 0.00 0.00
63 -2162.16 -5219.92 0.00 0.00 0.00 0.00
64 -2162.16 -5219.92 0.00 0.00 0.00 0.00
65 -2162.16 -5219.92 0.00 0.00 0.00 0.00
70 -2825.00 -4893.04 0.00 0.00 0.00 0.00
71 -2825.00 -4893.04 0.00 0.00 0.00 0.00
72 -2825.00 -4893.04 0.00 0.00 0.00 0.00
73 -2825.00 -4893.04 0.00 0.00 0.00 0.00
74 -2825.00 -4893.04 0.00 0.00 0.00 0.00
75 -2825.00 -4893.04 0.00 0.00 0.00 0.00
76 -2825.00 -4893.04 0.00 0.00 0.00 0.00
77 -2825.00 -4893.04 0.00 0.00 0.00 0.00
78 -2825.00 -4893.04 0.00 0.00 0.00 0.00
79 -2825.00 -4893.04 0.00 0.00 0.00 0.00
80 -2825.00 -4893.04 0.00 0.00 0.00 0.00
81 -2825.00 -4893.04 0.00 0.00 0.00 0.00
82 -2825.00 -4893.04 0.00 0.00 0.00 0.00
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$$$$ Define Nodes and Elements
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*END
