Pendulum
A pendulum with two colliding spheres is calculated. The pendulum is modelled with beam elements of elastic behaviour. The spheres are modelled with shell elements of plastic behaviour and one of it is given an initial velocity. The *DEFORMABLE_TO_RIGID option is used to decrease execution time before impact.
https://www.dynaexamples.com/introduction/intro-by-a.-tabiei/misc/pendlum
https://www.dynaexamples.com/@@site-logo/LS-DYNA-Examples-Logo480x80.png
Pendulum
A pendulum with two colliding spheres is calculated. The pendulum is modelled with beam elements of elastic behaviour. The spheres are modelled with shell elements of plastic behaviour and one of it is given an initial velocity. The *DEFORMABLE_TO_RIGID option is used to decrease execution time before impact.
*BOUNDARY_SPC_NODE *CONTACT_AUTOMATIC_SINGLE_SURFACE *CONTROL_CONTACT *CONTROL_ENERGY *CONTROL_OUTPUT *CONTROL_SHELL *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 *DEFINE_CURVE *DEFORMABLE_TO_RIGID *ELEMENT_BEAM *ELEMENT_SHELL *END *INITIAL_VELOCITY *KEYWORD *LOAD_BODY_Y *MAT_ELASTIC *MAT_PLASTIC_KINEMATIC *NODE *PART *SECTION_BEAM *SECTION_SHELL *TITLE
*KEYWORD
*TITLE
Pendulum with 2 spheres colliding
$
$ J.D. Reid 6/22/95, 4/7/98
$
$ Units: mm, kg, ms, kN, GPa, kN-mm
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$$$$ Control Ouput
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
*CONTROL_TERMINATION
$ endtim endcyc dtmin endeng endmas
11.0
$
*CONTROL_ENERGY
$ hgen rwen slnten rylen
2 2
$
*CONTROL_OUTPUT
$ npopt neecho nrefup iaccop opifs ipnint ikedit
1 3
$
*CONTROL_SHELL
$ wrpang itrist irnxx istupd theory bwc miter
1 2
$
*DATABASE_BINARY_D3PLOT
$ dt lcdt
1.00
$ 0.1
$
*DATABASE_EXTENT_BINARY
$ neiph neips maxint strflg sigflg epsflg rltflg engflg
$ cmpflg ieverp beamip
1
$
*DATABASE_BINARY_D3THDT
$ dt lcdt
999999
$
$
*DATABASE_GLSTAT
$ dt
0.10
$
*DATABASE_MATSUM
$ dt
0.10
$
*DATABASE_NODOUT
$ dt
0.10
$
*DATABASE_HISTORY_NODE
$ define nodes that output into nodout
$ id1 id2 id3 id4 id5 id6 id7 id8
350 374 678 713
$
*DATABASE_RBDOUT
$ dt
0.10
$
*DATABASE_RCFORC
$ dt
0.10
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$$$$ Define Contacts - Sliding Interfaces
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
*CONTACT_AUTOMATIC_SINGLE_SURFACE
$ ssid msid sstyp mstyp sboxid mboxid spr mpr
0
$ Equating ssid to zero means that all segments are included in the contact
$
$ fs fd dc vc vdc penchk bt dt
0.08 0.08
$ sfs sfm sst mst sfst sfmt fsf vsf
$
$
$ Add Flag to insure that thickness is checked during surface/surface contact
$
$
*CONTROL_CONTACT
$ slsfac rwpnal islchk shlthk penopt thkchg orien
2
$ usrstr usrfrc nsbcs interm xpene ssthk ecdt tiedprj
$
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$$$$ Gravity
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
*LOAD_BODY_Y
$ lcid sf lciddr xc yc zc
1 0.00981
$
*DEFINE_CURVE
$ lcid sidr scla sclo offa offo
1
$
$ abscissa ordinate
$
0.00 1.000
10000.00 1.000
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$$$$ Boundary and Initial Conditions
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
$$$$ Constrain translation of end points of beams
$
*BOUNDARY_SPC_NODE
$ nid cid dofx dofy dofz dofrx dofry dofrz
45004 0 1 1 1 0 0 0
45005 0 1 1 1 0 0 0
45010 0 1 1 1 0 0 0
45011 0 1 1 1 0 0 0
$
$
*INITIAL_VELOCITY
$ nsid nsidex boxid
5
$
$ vx vy vz wx wy wz
0.0 -12.0 0.0
$
*DEFINE_BOX
$ boxid xmm xmx ymn ymx zmn zmx
5 -120.0 -80.0 80.0 120.0 -30.0 30.0
$
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$$$$ Define Parts and Materials
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
*PART
$ pid sid mid eosid hgid grav adpopt
sphere1
1 1 1
sphere2
2 2 1
$
$
$$$$ Materials
$
$ Aluminum
$
*MAT_PLASTIC_KINEMATIC
$ mid ro e pr sigy etan beta
1 2.70e-6 68.9 0.330 0.286 0.00689
$
$ src srp fs
$
$$$$ Sections
$
$
*SECTION_SHELL
$ sid elform shrf nip propt qr/irid icomp
1 2
$
$ t1 t2 t3 t4 nloc
1.0 1.0 1.0 1.0
$
*SECTION_SHELL
$ sid elform shrf nip propt qr/irid icomp
2 2
$
1.0 1.0 1.0 1.0
$
$
$$$$$ PENDULUM WIRES - ELASTIC BEAMS
$
*PART
Pendulum Wires - Elastic Beams
$ pid sid mid eosid hgid grav adpopt
45 45 45
$
$
*SECTION_BEAM
$ sid elform shrf qr/irid cst
45 3 1.00000 1.0
$
$ int: ts1 ts2 tt1 tt2 nsloc ntloc
$
$ res: a iss itt irr sa
10.0
$
$ disc:vol iner cid ca offset
$
$ t1 t2 t3 t4 nloc
$
$
*MAT_ELASTIC
$ mid ro e pr da db k
45 7.86e-6 210.0 0.30
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$$$$ Deformable Switching
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
*DEFORMABLE_TO_RIGID
$ pid mrb
1
$
*DEFORMABLE_TO_RIGID
$ pid mrb
2
$
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$$$$ Define Nodes and Elements
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
*END