Oasys LS-DYNA Environment 8.1 VOLUME 3 ... - Oasys Software

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Oasys LS-DYNA Environment: User Guide (Version 8.1) LS-DYNA Manual Section: *CONSTRAINED_JOINT_PLANAR Additional Sections: *LOAD_NODE_POINT *LOAD_SEGMENT *INITIAL_VELOCITY *CONSTRAINED_NODES_EXTRA_SET Example of: Sliding Blocks with Planar Joint Example File Name: joint_planar.key Description: This problem illustrates a planar joint connecting two rigid bodies. Model: The first block measuring 2 × 2 × 2 slides along a second block measuring 2 × 2 × 8. A third flexible body controls the time step size. The first block has a ramped pressure of 100 psi applied to the top surface and ramped concentrated nodal forces applied to a lower edge of 40 lbs. The initial velocity of the first block is 400 inches/second. Input: The model contains a single joint definition consisting of nodes 128, 126, 129 and 127 (*CONSTRAINED_JOINT_PLANAR). These nodes are coincident and are attached to the rigid bodies as extra nodes (*CONSTRAINED_EXTRA_NODES_SET, *SET_NODE_LIST) Results: The plots simply show that the first block correctly slides across the second block. Page A.8
Oasys LS-DYNA Environment: User Guide (Version 8.1) List of LS-DYNA input deck: *KEYWORD *TITLE LINEAR CONSTRAINT EQUATIONS $ $================================ CONTROL CARDS ================================ $ *CONTROL_TERMINATION $ [1] Termination time [2] Termination Cycle [3] Minimum timestep scale factor $ [4] % Energy change for termination [5] % Mass change for termination $ 1 ][ 2 ][ 3 ][ 4 ][ 5 ] 5.000E-04 0 .000E+00 .000E+00 .000E+00 *CONTROL_SHELL $ [1] Shell warpage angle [2] Automatic sorting of triangles [3] Hughes-Liu $ update option [4] Shell thickness change option [5] Shell theory [6] Warping $ stiffness [7] Plane stress plasticity option $ 1 ][ 2 ][ 3 ][ 4 ][ 5 ][ 6 ][ 7 ] 2.000E+01 2 -1 0 1 2 1 *CONTROL_CONTACT $ [1] Interface penalty scale factor [2] Rigid wall penalty scale factor $ [3] Initial penetration check [4] Shell thickness in type 3,5,10 contacts [5] $ Penalty stiffness option [6] Consider shell thickness change (single surface $ contact) [7] Automatic reorientation of interface segments $ 1 ][ 2 ][ 3 ][ 4 ][ 5 ][ 6 ][ 7 ] 1.000E-01 .000E+00 2 0 1 0 0 $ [1] Storage per contact surface [2] Storage per user defined friction $ [3] Timesteps between bucket searches [4] Intermittent searching [5] Search $ multiplier [6] Shell thickness logic [7] Timstep override for eroding contacts $ 1 ][ 2 ][ 3 ][ 4 ][ 5 ][ 6 ][ 7 ] 0 0 0 0 .000E+00 *CONTROL_ENERGY $ [1] Compute hourglass energy [2] Compute stonewall energy dissipation $ [3] Compute sliding interface energy [4] Compute Rayleigh energy dissipation $ 1 ][ 2 ][ 3 ][ 4 ] 0 0 0 0 *CONTROL_DAMPING $ [1] No cycles between convergence checks [2] DR convergence tolerance [3] DR $ damping factor [4] DR Optional termination time [5] Scale factor for DR time $ step [6] Automatic control for DR option [7] Convergence tolerance for $ automatic DR [8] DR flag for stress initialization $ 1 ][ 2 ][ 3 ][ 4 ][ 5 ][ 6 ][ 7 ][ 8 ] 0 .000E+00 .000E+00 .000E+00 .000E+00 0 .000E+00 0 *CONTROL_OUTPUT $ [1] Print suppression during input phase [2] Print suppression for echo file $ [3] Update beam reference nodes [4] Average accelerations from velocities $ [5] Output interval for interface file [6] Print all element initial timestep $ [7] Number of cycles between output to otf file $ 1 ][ 2 ][ 3 ][ 4 ][ 5 ][ 6 ][ 7 ] 0 0 0 0 .000E+00 0 0 *CONTROL_TIMESTEP $ [1] Initial timestep size [2] Scale factor for computed timestep [3] Basis of $ timestep size calculation [4] Minimum timestep for shell elements [5] Timestep $ size for mass scaled solution [6] Load curve number that limits time step $ [7] Erode solids and shells when minimum timestep reached $ 1 ][ 2 ][ 3 ][ 4 ][ 5 ][ 6 ][ 7 ] .000E+00 .000E+00 0 .000E+00 .000E+00 0 0 0 *CONTROL_HOURGLASS 4 .000E+00 $ $================================ DATABASE CARDS =============================== $ *DATABASE_BINARY_D3PLOT 2.000E-05 0 1 *DATABASE_BINARY_XTFILE *DATABASE_BINARY_D3THDT 1.000E-06 0 *DATABASE_BINARY_D3DUMP 0 *DATABASE_BINARY_RUNRSF 0 *DATABASE_BINARY_INTFOR 2.000E-05 0 *DATABASE_EXTENT_BINARY 0 0 0 1 0 0 0 0 0 0 0 $ $============================ MATERIAL PROPERTIES ============================== $ Page A.9
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Oasys LS-DYNA Environment 8.1 VOLUME 3 ... - Oasys Software

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