A sphere impacts a plate at high speed causing failure of the plate. This model can be used to show how different contacts can behave differently in a rather simple model. Instructions of this are explained in the header of the input deck.
CONTACT_TIED_NODES_TO_SURFACE Discrete Nodes Tied to a Surface CONTACT_NODES_TO_SURFACE Rigid Sphere Impacts a Plate at High Speed LS-DYNA Manual Section: *CONTACT_NODES_TO_SURFACE Additional Sections: *CONSTRAINED_TIED_NODES_FAILURE Example: Rigid Sphere Impacts a Plate at High Speed Filename: contact.n2s-sphere.k Description: A sphere impacts a plate at high speed causing failure of the plate. This model can be used to show how different contacts can behave differently in a rather simple model. Instructions of this are explained in the header of the input deck. Model: A rigid sphere is made out of solid elements and given an initial velocity of 89 mm/ms towards a plate using the *DEFINE_BOX keyword. The plate is constructed out of shell elements. The shells of the plates do NOT have their nodes merged at common locations. Instead, tied nodes with failure constraints are used to connect the common nodes. This allows the plate to rupture and rip along seam lines instead of having elements fail (and being deleted) by using the more common failure criteria within the material definition. Results: The plate is definitely not made out of a bullet proof material. Example: Discrete Nodes Tied to a Surface Filename: contact.tied_nodes.box.k Description: A shell element drops onto and then rebounds from, a hollow box that is tied to an elastic plate. Model: The plate measures 40 * 40 * 1 mm3 and contains 16 Belytschko-Tsay shell elements. The dropped shell element has a side length of 10 mm, a thickness of 2 mm and a drop height of 10 mm. The box contains 12 Belytschko-Tsay shell elements. All shell element materials are elastic. The initial velocity of the shell elements is 100,000 mm/second. The calculation terminates at 0.002 seconds. Input: The nodes of the dropped shell are given an initial velocity (*INITIAL_VELOCITY). The nodes on the bottom of the box, those facing the plate, are tied to the plate (*CONTACT_TIED_NODES_TO_SURFACE). Automatic single surface contact is used to define the contact between the dropped shell and the box. Reference: Schweizerhof, K. and Weimar, K.
$ *CONSTRAINED_TIED_NODES_FAILURE at the end of the deck and re-run $ * Contact: nodes (plate - 2) to surface (sphere - 3) good <== this file $ * Part 2 - plate $ * Part 3 - sphere *BOUNDARY_SPC_NODE *CONSTRAINED_TIED_NODES_FAILURE *CONTACT_NODES_TO_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_RBDOUT *DATABASE_RCFORC *DEFINE_BOX *ELEMENT_SHELL *ELEMENT_SOLID *END *INITIAL_VELOCITY *KEYWORD *MAT_PIECEWISE_LINEAR_PLASTICITY *MAT_RIGID *NODE *PART *SECTION_SHELL *SECTION_SOLID *SET_NODE_LIST *TITLE
*KEYWORD
*TITLE
Rigid sphere dropped onto a plate
$
$ LSTC Example
$
$ Last Modified: September 4, 1997
$
$ * Part 2 - plate
$ Shells (2.5 mm thick)
$ Mild steel (with strain rate effect)
$ Constrained on all four edges
$ Connected using Tied Nodes with Failure Constraints
$
$ * Part 3 - sphere
$ Solids
$ Rigid
$ Initial Velocity: -89 mm/ms to all nodes of the sphere
$
$ * Contact: nodes (plate - 2) to surface (sphere - 3) good <== this file
$ nodes (sphere - 3) to surface (plate - 2) bad
$
$ Note: For a really good demonstration of bad contact, remove all of the
$ *CONSTRAINED_TIED_NODES_FAILURE at the end of the deck and re-run
$ with the two contact definitions pointed out above.
$
$ Units: mm, kg, ms, kN, GPa, kN-mm
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$$$$ Control Ouput
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
*CONTROL_TERMINATION
$ endtim endcyc dtmin endeng endmas
0.60 0 0.0 0.0 0.0
$
*CONTROL_ENERGY
$ hgen rwen slnten rylen
2 2
$
*CONTROL_OUTPUT
$ npopt neecho nrefup iaccop opifs ipnint ikedit
1 3
$
$
*DATABASE_BINARY_D3PLOT
$ dt lcdt
0.1
$
*DATABASE_EXTENT_BINARY
$ neiph neips maxint strflg sigflg epsflg rltflg engflg
$
$ cmpflg ieverp beamip
1
$
*DATABASE_BINARY_D3THDT
$ dt lcdt
999999
$
*DATABASE_GLSTAT
$ dt
0.005
$
*DATABASE_MATSUM
$ dt
0.005
$
*DATABASE_NODOUT
$ dt
0.005
$
*DATABASE_HISTORY_NODE
$ id1 id2 id3 id4 id5 id6 id7 id8
2633 362 489
$
*DATABASE_RBDOUT
$ dt
0.005
$
*DATABASE_RCFORC
$ dt
0.005
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$$$$ Initial Velocity
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
*INITIAL_VELOCITY
$
$ nsid nsidex boxid
5
$
$ vx vy vz wx wy wz
0.0 0.0 -89.0
$
*DEFINE_BOX
$
$ boxid xmm xmx ymn ymx zmn zmx
5 -39.0 39.0 -39.0 39.0 -25.41 51.0
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$$$$ Define Contacts - sliding interface definitions
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
*CONTACT_NODES_TO_SURFACE
$
$ ssid msid sstyp mstyp sboxid mboxid spr mpr
2 3 3 3
$
$ fs fd dc vc vdc penchk bt dt
$
$ sfs sfm sst mst sfst sfmt fsf vsf
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$$$$ Define Parts and Materials
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
*PART
$
$ pid sid mid eosid hgid grav adpopt
plate
2 1 1
sphere
3 2 2
$
$
$$$$ Materials
$
*MAT_PIECEWISE_LINEAR_PLASTICITY
$
$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$ mid ro e pr sigy etan eppf tdel
1 0.783E-05 200.0 0.3 0.207 0.750
$ Cowper/Symonds Strain Rate Parameters
$ c p lcss lcsr
40 5
$ Plastic stress/strain curves
0.000 0.080 0.160 0.400 1.000
0.207 0.250 0.275 0.290 0.300
$
$
*MAT_RIGID
$
$ mid ro e pr n couple m alias
2 0.783E-05 200.0 0.3
$
$ cmo con1 con2
$
$ lco/a1 a2 a3 v1 v2 v3
$
$
$$$$ Sections
$
*SECTION_SHELL
$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$ sid elform shrf nip propt qr/irid icomp
1 2 3.0
$ t1 t2 t3 t4 nloc
2.50 2.50 2.50 2.50
$
*SECTION_SOLID
$
$ sid elform
2
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$$$$ Boundary and Initial Conditions
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
$$$$ Fix all the edge nodes of the plate with SPC's.
$
*BOUNDARY_SPC_NODE
$ nid cid dofx dofy dofz dofrx dofry dofrz
773 0 1 1 1 1 1 1
774 0 1 1 1 1 1 1
776 0 1 1 1 1 1 1
777 0 1 1 1 1 1 1
780 0 1 1 1 1 1 1
781 0 1 1 1 1 1 1
784 0 1 1 1 1 1 1
785 0 1 1 1 1 1 1
788 0 1 1 1 1 1 1
789 0 1 1 1 1 1 1
792 0 1 1 1 1 1 1
793 0 1 1 1 1 1 1
796 0 1 1 1 1 1 1
797 0 1 1 1 1 1 1
800 0 1 1 1 1 1 1
801 0 1 1 1 1 1 1
804 0 1 1 1 1 1 1
805 0 1 1 1 1 1 1
808 0 1 1 1 1 1 1
809 0 1 1 1 1 1 1
812 0 1 1 1 1 1 1
813 0 1 1 1 1 1 1
816 0 1 1 1 1 1 1
817 0 1 1 1 1 1 1
820 0 1 1 1 1 1 1
821 0 1 1 1 1 1 1
824 0 1 1 1 1 1 1
825 0 1 1 1 1 1 1
828 0 1 1 1 1 1 1
829 0 1 1 1 1 1 1
832 0 1 1 1 1 1 1
833 0 1 1 1 1 1 1
836 0 1 1 1 1 1 1
837 0 1 1 1 1 1 1
840 0 1 1 1 1 1 1
841 0 1 1 1 1 1 1
844 0 1 1 1 1 1 1
845 0 1 1 1 1 1 1
848 0 1 1 1 1 1 1
849 0 1 1 1 1 1 1
852 0 1 1 1 1 1 1
853 0 1 1 1 1 1 1
856 0 1 1 1 1 1 1
857 0 1 1 1 1 1 1
860 0 1 1 1 1 1 1
861 0 1 1 1 1 1 1
864 0 1 1 1 1 1 1
865 0 1 1 1 1 1 1
868 0 1 1 1 1 1 1
869 0 1 1 1 1 1 1
872 0 1 1 1 1 1 1
873 0 1 1 1 1 1 1
876 0 1 1 1 1 1 1
877 0 1 1 1 1 1 1
880 0 1 1 1 1 1 1
881 0 1 1 1 1 1 1
884 0 1 1 1 1 1 1
885 0 1 1 1 1 1 1
888 0 1 1 1 1 1 1
889 0 1 1 1 1 1 1
891 0 1 1 1 1 1 1
892 0 1 1 1 1 1 1
893 0 1 1 1 1 1 1
894 0 1 1 1 1 1 1
1011 0 1 1 1 1 1 1
1012 0 1 1 1 1 1 1
1013 0 1 1 1 1 1 1
1014 0 1 1 1 1 1 1
1131 0 1 1 1 1 1 1
1132 0 1 1 1 1 1 1
1133 0 1 1 1 1 1 1
1134 0 1 1 1 1 1 1
1251 0 1 1 1 1 1 1
1252 0 1 1 1 1 1 1
1253 0 1 1 1 1 1 1
1254 0 1 1 1 1 1 1
1371 0 1 1 1 1 1 1
1372 0 1 1 1 1 1 1
1373 0 1 1 1 1 1 1
1374 0 1 1 1 1 1 1
1491 0 1 1 1 1 1 1
1492 0 1 1 1 1 1 1
1493 0 1 1 1 1 1 1
1494 0 1 1 1 1 1 1
1611 0 1 1 1 1 1 1
1612 0 1 1 1 1 1 1
1613 0 1 1 1 1 1 1
1614 0 1 1 1 1 1 1
1731 0 1 1 1 1 1 1
1732 0 1 1 1 1 1 1
1733 0 1 1 1 1 1 1
1734 0 1 1 1 1 1 1
1851 0 1 1 1 1 1 1
1852 0 1 1 1 1 1 1
1853 0 1 1 1 1 1 1
1854 0 1 1 1 1 1 1
1971 0 1 1 1 1 1 1
1972 0 1 1 1 1 1 1
1973 0 1 1 1 1 1 1
1974 0 1 1 1 1 1 1
2091 0 1 1 1 1 1 1
2092 0 1 1 1 1 1 1
2093 0 1 1 1 1 1 1
2094 0 1 1 1 1 1 1
2211 0 1 1 1 1 1 1
2212 0 1 1 1 1 1 1
2213 0 1 1 1 1 1 1
2214 0 1 1 1 1 1 1
2331 0 1 1 1 1 1 1
2332 0 1 1 1 1 1 1
2333 0 1 1 1 1 1 1
2334 0 1 1 1 1 1 1
2451 0 1 1 1 1 1 1
2452 0 1 1 1 1 1 1
2453 0 1 1 1 1 1 1
2454 0 1 1 1 1 1 1
2571 0 1 1 1 1 1 1
2572 0 1 1 1 1 1 1
2573 0 1 1 1 1 1 1
2574 0 1 1 1 1 1 1
2691 0 1 1 1 1 1 1
2692 0 1 1 1 1 1 1
2693 0 1 1 1 1 1 1
2694 0 1 1 1 1 1 1
2811 0 1 1 1 1 1 1
2812 0 1 1 1 1 1 1
2813 0 1 1 1 1 1 1
2814 0 1 1 1 1 1 1
2931 0 1 1 1 1 1 1
2932 0 1 1 1 1 1 1
2933 0 1 1 1 1 1 1
2934 0 1 1 1 1 1 1
3051 0 1 1 1 1 1 1
3052 0 1 1 1 1 1 1
3053 0 1 1 1 1 1 1
3054 0 1 1 1 1 1 1
3171 0 1 1 1 1 1 1
3172 0 1 1 1 1 1 1
3173 0 1 1 1 1 1 1
3174 0 1 1 1 1 1 1
3291 0 1 1 1 1 1 1
3292 0 1 1 1 1 1 1
3293 0 1 1 1 1 1 1
3294 0 1 1 1 1 1 1
3411 0 1 1 1 1 1 1
3412 0 1 1 1 1 1 1
3413 0 1 1 1 1 1 1
3414 0 1 1 1 1 1 1
3531 0 1 1 1 1 1 1
3532 0 1 1 1 1 1 1
3533 0 1 1 1 1 1 1
3534 0 1 1 1 1 1 1
3651 0 1 1 1 1 1 1
3652 0 1 1 1 1 1 1
3653 0 1 1 1 1 1 1
3654 0 1 1 1 1 1 1
3771 0 1 1 1 1 1 1
3772 0 1 1 1 1 1 1
3773 0 1 1 1 1 1 1
3774 0 1 1 1 1 1 1
3891 0 1 1 1 1 1 1
3892 0 1 1 1 1 1 1
3893 0 1 1 1 1 1 1
3894 0 1 1 1 1 1 1
4011 0 1 1 1 1 1 1
4012 0 1 1 1 1 1 1
4013 0 1 1 1 1 1 1
4014 0 1 1 1 1 1 1
4131 0 1 1 1 1 1 1
4132 0 1 1 1 1 1 1
4133 0 1 1 1 1 1 1
4134 0 1 1 1 1 1 1
4251 0 1 1 1 1 1 1
4252 0 1 1 1 1 1 1
4253 0 1 1 1 1 1 1
4254 0 1 1 1 1 1 1
4255 0 1 1 1 1 1 1
4258 0 1 1 1 1 1 1
4259 0 1 1 1 1 1 1
4262 0 1 1 1 1 1 1
4263 0 1 1 1 1 1 1
4266 0 1 1 1 1 1 1
4267 0 1 1 1 1 1 1
4270 0 1 1 1 1 1 1
4271 0 1 1 1 1 1 1
4274 0 1 1 1 1 1 1
4275 0 1 1 1 1 1 1
4278 0 1 1 1 1 1 1
4279 0 1 1 1 1 1 1
4282 0 1 1 1 1 1 1
4283 0 1 1 1 1 1 1
4286 0 1 1 1 1 1 1
4287 0 1 1 1 1 1 1
4290 0 1 1 1 1 1 1
4291 0 1 1 1 1 1 1
4294 0 1 1 1 1 1 1
4295 0 1 1 1 1 1 1
4298 0 1 1 1 1 1 1
4299 0 1 1 1 1 1 1
4302 0 1 1 1 1 1 1
4303 0 1 1 1 1 1 1
4306 0 1 1 1 1 1 1
4307 0 1 1 1 1 1 1
4310 0 1 1 1 1 1 1
4311 0 1 1 1 1 1 1
4314 0 1 1 1 1 1 1
4315 0 1 1 1 1 1 1
4318 0 1 1 1 1 1 1
4319 0 1 1 1 1 1 1
4322 0 1 1 1 1 1 1
4323 0 1 1 1 1 1 1
4326 0 1 1 1 1 1 1
4327 0 1 1 1 1 1 1
4330 0 1 1 1 1 1 1
4331 0 1 1 1 1 1 1
4334 0 1 1 1 1 1 1
4335 0 1 1 1 1 1 1
4338 0 1 1 1 1 1 1
4339 0 1 1 1 1 1 1
4342 0 1 1 1 1 1 1
4343 0 1 1 1 1 1 1
4346 0 1 1 1 1 1 1
4347 0 1 1 1 1 1 1
4350 0 1 1 1 1 1 1
4351 0 1 1 1 1 1 1
4354 0 1 1 1 1 1 1
4355 0 1 1 1 1 1 1
4358 0 1 1 1 1 1 1
4359 0 1 1 1 1 1 1
4362 0 1 1 1 1 1 1
4363 0 1 1 1 1 1 1
4366 0 1 1 1 1 1 1
4367 0 1 1 1 1 1 1
4370 0 1 1 1 1 1 1
4371 0 1 1 1 1 1 1
4372 0 1 1 1 1 1 1
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$.........
*CONSTRAINED_TIED_NODES_FAILURE
$ nsid eppf
928 0.5000
*SET_NODE_LIST
$ sid
928
4195 4198 4316 4317
*CONSTRAINED_TIED_NODES_FAILURE
$ nsid eppf
929 0.5000
*SET_NODE_LIST
$ sid
929
4199 4202 4320 4321
*CONSTRAINED_TIED_NODES_FAILURE
$ nsid eppf
930 0.5000
*SET_NODE_LIST
$ sid
930
4203 4206 4324 4325
*CONSTRAINED_TIED_NODES_FAILURE
$ nsid eppf
931 0.5000
*SET_NODE_LIST
$ sid
931
4207 4210 4328 4329
*CONSTRAINED_TIED_NODES_FAILURE
$ nsid eppf
932 0.5000
*SET_NODE_LIST
$ sid
932
4211 4214 4332 4333
*CONSTRAINED_TIED_NODES_FAILURE
$ nsid eppf
933 0.5000
*SET_NODE_LIST
$ sid
933
4215 4218 4336 4337
*CONSTRAINED_TIED_NODES_FAILURE
$ nsid eppf
934 0.5000
*SET_NODE_LIST
$ sid
934
4219 4222 4340 4341
*CONSTRAINED_TIED_NODES_FAILURE
$ nsid eppf
935 0.5000
*SET_NODE_LIST
$ sid
935
4223 4226 4344 4345
*CONSTRAINED_TIED_NODES_FAILURE
$ nsid eppf
936 0.5000
*SET_NODE_LIST
$ sid
936
4227 4230 4348 4349
*CONSTRAINED_TIED_NODES_FAILURE
$ nsid eppf
937 0.5000
*SET_NODE_LIST
$ sid
937
4231 4234 4352 4353
*CONSTRAINED_TIED_NODES_FAILURE
$ nsid eppf
938 0.5000
*SET_NODE_LIST
$ sid
938
4235 4238 4356 4357
*CONSTRAINED_TIED_NODES_FAILURE
$ nsid eppf
939 0.5000
*SET_NODE_LIST
$ sid
939
4239 4242 4360 4361
*CONSTRAINED_TIED_NODES_FAILURE
$ nsid eppf
940 0.0850
*SET_NODE_LIST
$ sid
940
4243 4246 4364 4365
*CONSTRAINED_TIED_NODES_FAILURE
$ nsid eppf
941 0.0850
*SET_NODE_LIST
$ sid
941
4247 4250 4368 4369
$
$
*END
