Two plates are connected by four butt welds. The plates are pulled apart and the center two welds fail.
*CONSTRAINED_GENERALIZED_WELD Two Plates Connected With Butt Welds LS-DYNA Manual Section: *CONSTRAINED_GENERALIZED_WELD Additional Sections: *DATABASE_CROSS_SECTION_PLANE Example: Two Plates Connected with Butt Welds Filename: constrained.butt-weld.k Description: Two plates are connected by four butt welds. The plates are pulled apart and the center two welds fail. Model: Each plate is constructed with 12 shell elements. One end of one plate is fixed with SPC's. One end of the other plate has a prescribed motion condition defined. The other ends of the plates are butt welded together with failure criteria. Cross sections are defined through each plate to monitor the forces through the plates as they are pulled apart. results: butt weld constraint failed between nodes 35 & 23 : Time = 1.26913E+00 : xl-force = 5.56053E+00 : yl-force = 2.28915E-03 : zl-force = -1.93680E-07 : xl-moment = -3.16675E-07 : yl-moment = 9.09511E-07 : plastic ep= 0.00000E+00 Stresses in weld: : signn = 2.78026E-01 : tautn = 0.00000E+00 : signm = 9.09511E-08 : tautm = 0.00000E+00 : signs = 0.00000E+00 : tauts = 1.14458E-04 : tautw = -9.68398E-09 butt weld constraint failed between nodes 37 & 25 : Time = 1.26913E+00 : xl-force = 5.56054E+00 : yl-force = -2.29328E-03 : zl-force = -2.41027E-07 : xl-moment = 2.97763E-07 : yl-moment = 3.22515E-07 : plastic ep= 0.00000E+00 Stresses in weld: : signn = 2.78027E-01 : tautn = 0.00000E+00 : signm = 3.22515E-08 : tautm = 0.00000E+00 : signs = 0.00000E+00 : tauts = -1.14664E-04 : tautw = -1.20514E-08
*BOUNDARY_PRESCRIBED_MOTION_SET *BOUNDARY_SPC_NODE *CONSTRAINED_GENERALIZED_WELD_BUTT *CONTROL_ENERGY *CONTROL_OUTPUT *CONTROL_SHELL *CONTROL_TERMINATION *DATABASE_BINARY_D3PLOT *DATABASE_BINARY_D3THDT *DATABASE_CROSS_SECTION_PLANE *DATABASE_EXTENT_BINARY *DATABASE_GLSTAT *DATABASE_HISTORY_NODE *DATABASE_MATSUM *DATABASE_NODOUT *DATABASE_SECFORC *DEFINE_CURVE *ELEMENT_SHELL *END *KEYWORD *MAT_PLASTIC_KINEMATIC *NODE *PART *SECTION_SHELL *SET_NODE_LIST *TITLE
*KEYWORD
*TITLE
Two plates connected with a Butt Weld
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$ LSTC Example
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$ Last Modified: October 16, 1997
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$ Units: mm, kg, ms, kN, GPa, kN-mm
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$$$$ Control Ouput
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$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
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*CONTROL_TERMINATION
$ endtim endcyc dtmin endneg endmas
3.01
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*CONTROL_ENERGY
$ hgen rwen slnten rylen
2 2
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*CONTROL_OUTPUT
$ npopt neecho nrefup iaccop opifs ipnint ikedit
1 3
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*CONTROL_SHELL
$ wrpang itrist irnxx istupd theory bwc miter
1 6
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*DATABASE_BINARY_D3PLOT
$ dt lcdt
0.2
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*DATABASE_EXTENT_BINARY
$ neiph neips maxint strflg sigflg epsflg rltflg engflg
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$ cmpflg ieverp beamip
1
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*DATABASE_BINARY_D3THDT
$ dt lcdt
999999
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*DATABASE_GLSTAT
$ dt
0.1
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*DATABASE_MATSUM
$ dt
0.1
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*DATABASE_NODOUT
$ dt
0.1
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*DATABASE_HISTORY_NODE
$ id1 id2 id3 id4
22 23 35 36
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*DATABASE_SECFORC
$ dt
0.010
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$$$$ Define Cross Sections
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$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
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*DATABASE_CROSS_SECTION_PLANE
$ psid xct yct zct xch ych zch
0 15.0 0.0 0.0 100.0 0.0 0.0
$ xhev yhev xhev lenl lenm
15.0 1.0 0.0
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*DATABASE_CROSS_SECTION_PLANE
$ psid xct yct zct xch ych zch
0 65.0 0.0 0.0 100.0 0.0 0.0
$ xhev yhev xhev lenl lenm
65.0 1.0 0.0
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$$$$ Constrain the Plates Together with 4 Butt welds
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$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
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$$$$$$ weld 1
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*CONSTRAINED_GENERALIZED_WELD_BUTT
$ nsid cid
21
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$ tfail epsf sigy beta L D Lt
0.3 0.250 0.9 10.0 2.0 1.0
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*SET_NODE_LIST
$ sid
21
$ nid1 nid2
21 33
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$$$$$$ weld 2
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*CONSTRAINED_GENERALIZED_WELD_BUTT
$ nsid cid
23
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$ tfail epsf sigy beta L D Lt
0.3 0.250 0.9 10.0 2.0 1.0
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*SET_NODE_LIST
$ sid
23
$ nid1 nid2
23 35
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$$$$$ weld 3
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*CONSTRAINED_GENERALIZED_WELD_BUTT
$ nsid cid
25
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$ tfail epsf sigy beta L D Lt
0.3 0.250 0.9 10.0 2.0 1.0
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*SET_NODE_LIST
$ sid
25
$ nid1 nid2
25 37
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$$$$$$ weld 4
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*CONSTRAINED_GENERALIZED_WELD_BUTT
$ nsid cid
27
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$ tfail epsf sigy beta L D Lt
0.3 0.250 0.9 10.0 2.0 1.0
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*SET_NODE_LIST
$ sid
27
$ nid1 nid2
27 39
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$$$$ Boundary Conditions
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$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
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$$$ Fix left end nodes
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*BOUNDARY_SPC_NODE
$ nid cid dofx dofy dofz dofrx dofry dofrz
20 0 1 1 1 1 1 1
22 0 1 1 1 1 1 1
24 0 1 1 1 1 1 1
26 0 1 1 1 1 1 1
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$$$ Prescribe motion to right end nodes
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*BOUNDARY_PRESCRIBED_MOTION_SET
$ nid dof vad lcid sf vid
1 1 0 1 1.0 0
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*DEFINE_CURVE
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$ lcid sidr scla sclo offa offo
1
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$ abscissa ordinate
0.0000 0.0
5.0000 2.0000
20.0000 2.0000
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*SET_NODE_LIST
$ sid
1
$ nid1 nid2 nid3 nid4 nid5 nid6 nid7 nid8
34 36 38 40
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$$$$ Define Parts and Materials
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$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
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*PART
$ pid sid mid eosid hgid grav adpopt
plate1
2 2 1
plate2
3 2 1
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$$$$ Materials
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*MAT_PLASTIC_KINEMATIC
$ mid ro e pr sigy etan beta
1 2.70e-6 68.9 0.330 0.286 0.00689
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$ src srp fs
0.1
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$$$$ Sections
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*SECTION_SHELL
$ sid elform shrf nip propt qr/irid icomp
2 6
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$ t1 t2 t3 t4 nloc
2.0 2.0 2.0 2.0
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$$$$ Define Nodes and Elements
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$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
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*END
