Contact Friction I
This should model a drum rotating with initial angular velocity which should be brought to rest by a rubber pad pressed against it. This example does not work and you can learn from it, how to debug a LS-DYNA deck. See next example for solution. Download is available in the download section of this document.
Keywords
Keywords
This example has been taken from the introductory class of Prof. Dr. Ala Tabiei. Example name: brake_debug.k
The used Keywords in alphabetical order.
*BOUNDARY_SPC_SET *CONSTRAINED_EXTRA_NODES_NODE *CONSTRAINED_NODE_SET *CONTACT_NODES_TO_SURFACE *CONTROL_ENERGY *CONTROL_TERMINATION *CONTROL_TIMESTEP *DATABASE_BINARY_DPLOT *DATABASE_GLSTAT *DATABASE_HISTORY_NODE_SET *DATABASE_MATSUM *DATABASE_NODOUT *DATABASE_RCFORC *DEFINE_CURVE *ELEMENT_SHELL *ELEMENT_SOLID *END *INITIAL_VELOCITY_GENERATION *KEYWORD *LOAD_NODE_SET *MAT_MOONEY-RIVLIN_RUBBER *MAT_RIGID *NODE *PART *SECTION_SHELL *SECTION_SOLID *SET_NODE_LIST *TITLE
Reduced Input
Reduced Input
This example has been taken from the introductory class of Prof. Dr. Ala Tabiei. Example name: brake_debug.k
*Node and *Element Cards are removed.
*KEyWORD
*TItLE
BRAKING PROBLEM (N2S, RUBBER PAD)
$ learn how to debug an LS-DYNA deck
$ units: m, s, Kg, N
$ A. Tabiei 3/30/98
$---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
*CONTROL_TIMESTEP
0.0000 0.9000
*CONTROL_TERMINATION
0.2500
CONTROL_CONTACT
$ SLSFAC RWPNAL ISLCHK SHLTHK PENOPT THKCHG ORIEN
2 2
$ USRSTR USRFAC NSBCS INTERM XPENE
*CONTROL_ENERGY
$ hgen rwen slnten rylen
2 2
$---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
*DATABASE_BINARY_DPLOT
0.01
*DATABASE_MATSUM
0.100E-04
*DATABASE_NODOUT
0.100E-04
*DATABASE_RCFORC
0.100E-02
*DATABASE_GLSTAT
0.100E-04
*DATABASE_HISTORY_NODE_SET
10
$---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
*MAT_RIGID
$ MID RO E PR
1 7.890E+30 2.100E+11 3.000E-01
$ CMO CON CON2
1.000E+00 7.000E+00 5.000E+00
$ alternative method for specifying local system below (optional)
*MAT_MOONEY-RIVLIN_RUBBER
$ MID RO PR A B
2 5.000E+03 4.900E-01 5.520E+05 1.380E+05
$ if A=B=0, then a least square fit is computed from test based on data below
$---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
*SECTION_SHELL
1 2 0.000E+00 3.000E+00 0.000E+00 0.000E+00
5.000E-03 5.000E-03 5.000E-03 5.000E-03 0.000E+00
*SECTION_SOLID
2 1
*PART
DRUM:
10 1 1
*PART
BRAKE-PAD:
2 2 2
$---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
*CONSTRAINED_NODE_SET
$ NSID DOF
11 1
*CONSTRAINED_EXTRA_NODES_NODE
$ PID NID/NSID
1 259
$---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
*INITIAL_VELOCITY_GENERATION
$ ID STYP OMEGA
1 2 3.000E+02
$ XC YC ZC NX NY NZ PHASE
0.000E+00 0.000E+00 0.000E+00 0.000E+00 1.000E+00 0.000E+00 0
$---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
*SET_NODE_LIST
10
259
*SET_NODE_LIST
11
215 216 219 220 223 224 227 228
231 232 235 236 239 240 243 244
247 248 251 252 255 256
$---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
*LOAD_NODE_SET
$ NID/NSID DOF LCID SF CID
11 1 1 -1.59E+02 0
$---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
*BOUNDARY_SPC_SET
$ NID/NSID CID DOFX DOFY DOFZ DOFRX DOFRY DOFRZ
11 0 0 1 1 0 0 0
$---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
*DEFINE_CURVE
1
0.00000000000000E+00 1.0000000000000E+00
1.00000000000000E+04 1.0000000000000E+00
$---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
*CONTACT_nodes_TO_surface
2 1 2 3 0 0
0.1500000 0.1500000 0.0000000 0.0000000 0.0000000 0 0.0000000 1.000E+20
1.0000000 1.0000000 0.0000000 0.0000000 1.0000000 1.0000000 1.0000000 1.0000000
$---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
*NODE
3 0.000000000E+00 7.500000000E-02 -2.00000000E-01
4 0.000000000E+00 -7.50000000E-02 -2.00000000E-01
5 -1.74311485E-02 -7.50000000E-02 -1.99238940E-01
6 -3.47296355E-02 -7.50000000E-02 -1.96961551E-01
7 -5.17638090E-02 -7.50000000E-02 -1.93185165E-01
8 -6.84040287E-02 -7.50000000E-02 -1.87938524E-01
9 -8.45236523E-02 -7.50000000E-02 -1.81261557E-01
10 -1.00000000E-01 -7.50000000E-02 -1.73205081E-01
11 -1.14715287E-01 -7.50000000E-02 -1.63830409E-01
12 -1.28557522E-01 -7.50000000E-02 -1.53208889E-01
13 -1.41421356E-01 -7.50000000E-02 -1.41421356E-01
14 -1.53208889E-01 -7.50000000E-02 -1.28557522E-01
15 -1.63830409E-01 -7.50000000E-02 -1.14715287E-01
16 -1.73205081E-01 -7.50000000E-02 -1.00000000E-01
17 -1.81261557E-01 -7.50000000E-02 -8.45236523E-02
18 -1.87938524E-01 -7.50000000E-02 -6.84040287E-02
19 -1.93185165E-01 -7.50000000E-02 -5.17638090E-02
20 -1.96961551E-01 -7.50000000E-02 -3.47296355E-02
21 -1.99238940E-01 -7.50000000E-02 -1.74311485E-02
22 -2.00000000E-01 -7.50000000E-02 2.119381739E-15
23 -1.99238940E-01 -7.50000000E-02 1.743114855E-02
24 -1.96961551E-01 -7.50000000E-02 3.472963553E-02
25 -1.93185165E-01 -7.50000000E-02 5.176380902E-02
26 -1.87938524E-01 -7.50000000E-02 6.840402867E-02
27 -1.81261557E-01 -7.50000000E-02 8.452365235E-02
28 -1.73205081E-01 -7.50000000E-02 1.000000000E-01
29 -1.63830409E-01 -7.50000000E-02 1.147152873E-01
30 -1.53208889E-01 -7.50000000E-02 1.285575219E-01
31 -1.41421356E-01 -7.50000000E-02 1.414213562E-01
32 -1.28557522E-01 -7.50000000E-02 1.532088886E-01
33 -1.14715287E-01 -7.50000000E-02 1.638304089E-01
34 -1.00000000E-01 -7.50000000E-02 1.732050808E-01
35 -8.45236523E-02 -7.50000000E-02 1.812615574E-01
36 -6.84040287E-02 -7.50000000E-02 1.879385242E-01
37 -5.17638090E-02 -7.50000000E-02 1.931851653E-01
38 -3.47296355E-02 -7.50000000E-02 1.969615506E-01
39 -1.74311485E-02 -7.50000000E-02 1.992389396E-01
40 1.396592536E-15 -7.50000000E-02 2.000000000E-01
41 1.396592536E-15 7.500000000E-02 2.000000000E-01
42 -1.74311485E-02 7.500000000E-02 1.992389396E-01
43 -3.47296355E-02 7.500000000E-02 1.969615506E-01
44 -5.17638090E-02 7.500000000E-02 1.931851653E-01
45 -6.84040287E-02 7.500000000E-02 1.879385242E-01
46 -8.45236523E-02 7.500000000E-02 1.812615574E-01
47 -1.00000000E-01 7.500000000E-02 1.732050808E-01
48 -1.14715287E-01 7.500000000E-02 1.638304089E-01
49 -1.28557522E-01 7.500000000E-02 1.532088886E-01
50 -1.41421356E-01 7.500000000E-02 1.414213562E-01
51 -1.53208889E-01 7.500000000E-02 1.285575219E-01
52 -1.63830409E-01 7.500000000E-02 1.147152873E-01
53 -1.73205081E-01 7.500000000E-02 1.000000000E-01
54 -1.81261557E-01 7.500000000E-02 8.452365235E-02
55 -1.87938524E-01 7.500000000E-02 6.840402867E-02
56 -1.93185165E-01 7.500000000E-02 5.176380902E-02
57 -1.96961551E-01 7.500000000E-02 3.472963553E-02
58 -1.99238940E-01 7.500000000E-02 1.743114855E-02
59 -2.00000000E-01 7.500000000E-02 2.119381739E-15
60 -1.99238940E-01 7.500000000E-02 -1.74311485E-02
61 -1.96961551E-01 7.500000000E-02 -3.47296355E-02
62 -1.93185165E-01 7.500000000E-02 -5.17638090E-02
63 -1.87938524E-01 7.500000000E-02 -6.84040287E-02
64 -1.81261557E-01 7.500000000E-02 -8.45236523E-02
65 -1.73205081E-01 7.500000000E-02 -1.00000000E-01
66 -1.63830409E-01 7.500000000E-02 -1.14715287E-01
67 -1.53208889E-01 7.500000000E-02 -1.28557522E-01
68 -1.41421356E-01 7.500000000E-02 -1.41421356E-01
69 -1.28557522E-01 7.500000000E-02 -1.53208889E-01
70 -1.14715287E-01 7.500000000E-02 -1.63830409E-01
71 -1.00000000E-01 7.500000000E-02 -1.73205081E-01
72 -8.45236523E-02 7.500000000E-02 -1.81261557E-01
73 -6.84040287E-02 7.500000000E-02 -1.87938524E-01
74 -5.17638090E-02 7.500000000E-02 -1.93185165E-01
75 -3.47296355E-02 7.500000000E-02 -1.96961551E-01
76 -1.74311485E-02 7.500000000E-02 -1.99238940E-01
77 1.743114855E-02 7.500000000E-02 -1.99238940E-01
78 3.472963553E-02 7.500000000E-02 -1.96961551E-01
79 5.176380902E-02 7.500000000E-02 -1.93185165E-01
80 6.840402867E-02 7.500000000E-02 -1.87938524E-01
81 8.452365235E-02 7.500000000E-02 -1.81261557E-01
82 1.000000000E-01 7.500000000E-02 -1.73205081E-01
83 1.147152873E-01 7.500000000E-02 -1.63830409E-01
84 1.285575219E-01 7.500000000E-02 -1.53208889E-01
85 1.414213562E-01 7.500000000E-02 -1.41421356E-01
86 1.532088886E-01 7.500000000E-02 -1.28557522E-01
87 1.638304089E-01 7.500000000E-02 -1.14715287E-01
88 1.732050808E-01 7.500000000E-02 -1.00000000E-01
89 1.812615574E-01 7.500000000E-02 -8.45236523E-02
90 1.879385242E-01 7.500000000E-02 -6.84040287E-02
91 1.931851653E-01 7.500000000E-02 -5.17638090E-02
92 1.969615506E-01 7.500000000E-02 -3.47296355E-02
93 1.992389396E-01 7.500000000E-02 -1.74311485E-02
94 2.000000000E-01 7.500000000E-02 -7.67198125E-16
95 1.992389396E-01 7.500000000E-02 1.743114855E-02
96 1.969615506E-01 7.500000000E-02 3.472963553E-02
97 1.931851653E-01 7.500000000E-02 5.176380902E-02
98 1.879385242E-01 7.500000000E-02 6.840402867E-02
99 1.812615574E-01 7.500000000E-02 8.452365235E-02
100 1.732050808E-01 7.500000000E-02 1.000000000E-01
101 1.638304089E-01 7.500000000E-02 1.147152873E-01
102 1.532088886E-01 7.500000000E-02 1.285575219E-01
103 1.414213562E-01 7.500000000E-02 1.414213562E-01
104 1.285575219E-01 7.500000000E-02 1.532088886E-01
105 1.147152873E-01 7.500000000E-02 1.638304089E-01
106 1.000000000E-01 7.500000000E-02 1.732050808E-01
107 8.452365235E-02 7.500000000E-02 1.812615574E-01
108 6.840402867E-02 7.500000000E-02 1.879385242E-01
109 5.176380902E-02 7.500000000E-02 1.931851653E-01
110 3.472963553E-02 7.500000000E-02 1.969615506E-01
111 1.743114855E-02 7.500000000E-02 1.992389396E-01
112 1.743114855E-02 -7.50000000E-02 1.992389396E-01
113 3.472963553E-02 -7.50000000E-02 1.969615506E-01
114 5.176380902E-02 -7.50000000E-02 1.931851653E-01
115 6.840402867E-02 -7.50000000E-02 1.879385242E-01
116 8.452365235E-02 -7.50000000E-02 1.812615574E-01
117 1.000000000E-01 -7.50000000E-02 1.732050808E-01
118 1.147152873E-01 -7.50000000E-02 1.638304089E-01
119 1.285575219E-01 -7.50000000E-02 1.532088886E-01
120 1.414213562E-01 -7.50000000E-02 1.414213562E-01
121 1.532088886E-01 -7.50000000E-02 1.285575219E-01
122 1.638304089E-01 -7.50000000E-02 1.147152873E-01
123 1.732050808E-01 -7.50000000E-02 1.000000000E-01
124 1.812615574E-01 -7.50000000E-02 8.452365235E-02
125 1.879385242E-01 -7.50000000E-02 6.840402867E-02
126 1.931851653E-01 -7.50000000E-02 5.176380902E-02
127 1.969615506E-01 -7.50000000E-02 3.472963553E-02
128 1.992389396E-01 -7.50000000E-02 1.743114855E-02
129 2.000000000E-01 -7.50000000E-02 -7.67198125E-16
130 1.992389396E-01 -7.50000000E-02 -1.74311485E-02
131 1.969615506E-01 -7.50000000E-02 -3.47296355E-02
132 1.931851653E-01 -7.50000000E-02 -5.17638090E-02
133 1.879385242E-01 -7.50000000E-02 -6.84040287E-02
134 1.812615574E-01 -7.50000000E-02 -8.45236523E-02
135 1.732050808E-01 -7.50000000E-02 -1.00000000E-01
136 1.638304089E-01 -7.50000000E-02 -1.14715287E-01
137 1.532088886E-01 -7.50000000E-02 -1.28557522E-01
138 1.414213562E-01 -7.50000000E-02 -1.41421356E-01
139 1.285575219E-01 -7.50000000E-02 -1.53208889E-01
140 1.147152873E-01 -7.50000000E-02 -1.63830409E-01
141 1.000000000E-01 -7.50000000E-02 -1.73205081E-01
142 8.452365235E-02 -7.50000000E-02 -1.81261557E-01
143 6.840402867E-02 -7.50000000E-02 -1.87938524E-01
144 5.176380902E-02 -7.50000000E-02 -1.93185165E-01
145 3.472963553E-02 -7.50000000E-02 -1.96961551E-01
146 1.743114855E-02 -7.50000000E-02 -1.99238940E-01
215 2.525000000E-01 -5.00000000E-02 -5.00000000E-02
216 2.525000000E-01 5.000000000E-02 -5.00000000E-02
217 2.025000000E-01 -5.00000000E-02 -5.00000000E-02
218 2.025000000E-01 5.000000000E-02 -5.00000000E-02
219 2.525000000E-01 -5.00000000E-02 -4.00000000E-02
220 2.525000000E-01 5.000000000E-02 -4.00000000E-02
221 2.025000000E-01 -5.00000000E-02 -4.00000000E-02
222 2.025000000E-01 5.000000000E-02 -4.00000000E-02
223 2.525000000E-01 -5.00000000E-02 -3.00000000E-02
224 2.525000000E-01 5.000000000E-02 -3.00000000E-02
225 2.025000000E-01 -5.00000000E-02 -3.00000000E-02
226 2.025000000E-01 5.000000000E-02 -3.00000000E-02
227 2.525000000E-01 -5.00000000E-02 -2.00000000E-02
228 2.525000000E-01 5.000000000E-02 -2.00000000E-02
229 2.025000000E-01 -5.00000000E-02 -2.00000000E-02
230 2.025000000E-01 5.000000000E-02 -2.00000000E-02
231 2.525000000E-01 -5.00000000E-02 -1.00000000E-02
232 2.525000000E-01 5.000000000E-02 -1.00000000E-02
233 2.025000000E-01 -5.00000000E-02 -1.00000000E-02
234 2.025000000E-01 5.000000000E-02 -1.00000000E-02
235 2.525000000E-01 -5.00000000E-02 1.387778781E-17
236 2.525000000E-01 5.000000000E-02 1.387778781E-17
237 2.025000000E-01 -5.00000000E-02 1.387778781E-17
238 2.025000000E-01 5.000000000E-02 1.387778781E-17
239 2.525000000E-01 -5.00000000E-02 1.000000000E-02
240 2.525000000E-01 5.000000000E-02 1.000000000E-02
241 2.025000000E-01 -5.00000000E-02 1.000000000E-02
242 2.025000000E-01 5.000000000E-02 1.000000000E-02
243 2.525000000E-01 -5.00000000E-02 2.000000000E-02
244 2.525000000E-01 5.000000000E-02 2.000000000E-02
245 2.025000000E-01 -5.00000000E-02 2.000000000E-02
246 2.025000000E-01 5.000000000E-02 2.000000000E-02
247 2.525000000E-01 -5.00000000E-02 3.000000000E-02
248 2.525000000E-01 5.000000000E-02 3.000000000E-02
249 2.025000000E-01 -5.00000000E-02 3.000000000E-02
250 2.025000000E-01 5.000000000E-02 3.000000000E-02
251 2.525000000E-01 -5.00000000E-02 4.000000000E-02
252 2.525000000E-01 5.000000000E-02 4.000000000E-02
253 2.025000000E-01 -5.00000000E-02 4.000000000E-02
254 2.025000000E-01 5.000000000E-02 4.000000000E-02
255 2.525000000E-01 -5.00000000E-02 5.000000000E-02
256 2.525000000E-01 5.000000000E-02 5.000000000E-02
257 2.025000000E-01 -5.00000000E-02 5.000000000E-02
258 2.025000000E-01 5.000000000E-02 5.000000000E-02
259 0.000000000E+00 0.000000000E+00 0.000000000E+00
*ELEMENT_SHELL
1 1 4 5 76 3
2 1 5 6 75 76
3 1 6 7 74 75
4 1 7 8 73 74
5 1 8 9 72 73
6 1 9 10 71 72
7 1 10 11 70 71
8 1 11 12 69 70
9 1 12 13 68 69
10 1 13 14 67 68
11 1 14 15 66 67
12 1 15 16 65 66
13 1 16 17 64 65
14 1 17 18 63 64
15 1 18 19 62 63
16 1 19 20 61 62
17 1 20 21 60 61
18 1 21 22 59 60
19 1 22 23 58 59
20 1 23 24 57 58
21 1 24 25 56 57
22 1 25 26 55 56
23 1 26 27 54 55
24 1 27 28 53 54
25 1 28 29 52 53
26 1 29 30 51 52
27 1 30 31 50 51
28 1 31 32 49 50
29 1 32 33 48 49
30 1 33 34 47 48
31 1 34 35 46 47
32 1 35 36 45 46
33 1 36 37 44 45
34 1 37 38 43 44
35 1 38 39 42 43
36 1 39 40 41 42
37 1 3 77 146 4
38 1 77 78 145 146
39 1 78 79 144 145
40 1 79 80 143 144
41 1 80 81 142 143
42 1 81 82 141 142
43 1 82 83 140 141
44 1 83 84 139 140
45 1 84 85 138 139
46 1 85 86 137 138
47 1 86 87 136 137
48 1 87 88 135 136
49 1 88 89 134 135
50 1 89 90 133 134
51 1 90 91 132 133
52 1 91 92 131 132
53 1 92 93 130 131
54 1 93 94 129 130
55 1 94 95 128 129
56 1 95 96 127 128
57 1 96 97 126 127
58 1 97 98 125 126
59 1 98 99 124 125
60 1 99 100 123 124
61 1 100 101 122 123
62 1 101 102 121 122
63 1 102 103 120 121
64 1 103 104 119 120
65 1 104 105 118 119
66 1 105 106 117 118
67 1 106 107 116 117
68 1 107 108 115 116
69 1 108 109 114 115
70 1 109 110 113 114
71 1 110 111 112 113
72 1 111 41 40 112
*ELEMENT_SOLID
73 2 215 216 218 217 219 220 222 221
74 2 219 220 222 221 223 224 226 225
75 2 223 224 226 225 227 228 230 229
76 2 227 228 230 229 231 232 234 233
77 2 231 232 234 233 235 236 238 237
78 2 235 236 238 237 239 240 242 241
79 2 239 240 242 241 243 244 246 245
80 2 243 244 246 245 247 248 250 249
81 2 247 248 250 249 251 252 254 253
82 2 251 252 254 253 255 256 258 257
*END
Figures
Figures
This example has been taken from the introductory class of Prof. Dr. Ala Tabiei. Example name: brake_debug.k
Animated Result
Animated Result
This example has been taken from the introductory class of Prof. Dr. Ala Tabiei. Example name: brake_debug.k
Download
Download
This example has been taken from the introductory class of Prof. Dr. Ala Tabiei. Example name: brake_debug.k
