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: *RIGIDWALL_PLANAR_FORCES Example of: Cube Rebounding from a Rigidwall Example Filename: rigidwall_cube.key Description: A cube impacts and rebounds from a rigid plate modelled using a Stonewall (Rigidwall). The rigidwall is defined using four nodes si that it appears as a finite rigidwall in D3PLOT. Model: The cube measures 10 × 10 × 10 mm 3 and is 10 mm above the rigid plate. It has 8 brick elements with elastic material properties. The initial velocity of the cube is 100,000 mm/second. The plate is an infinite “Stonewall” surface. Termination time is 0.0004 seconds. Input: The box option defines the nodes with the initial velocity (*INITIAL_VELOCITY. The location of the “Stonewall” is at z=0 (*RIGIDWALL_PLANAR_FORCES). The nine nodes on the lower side of the cube are slave nodes to the “Stonewall” definition. These slave nodes will not pass this plane within 10 time steps by the contact with the “stonewall”. Reference: Schweizerhof, K. and Weimer, K. Page A.110
Oasys LS-DYNA Environment: User Guide (Version 8.1) List of LS-DYNA input deck: *KEYWORD *TITLE STONEWALL SURFACE $ $================================ 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 ] 4.001E-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 ] .000E+00 0 0 0 0 0 0 *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 ] .000E+00 .000E+00 0 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 ] 2 0 1 1 *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 1000 0 0 2.000E-06 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-07 0 *DATABASE_BINARY_D3DUMP 0 *DATABASE_BINARY_RUNRSF 0 *DATABASE_BINARY_INTFOR 2.000E-05 0 *DATABASE_HISTORY_NODE 13 201 *DATABASE_EXTENT_BINARY 0 0 0 1 0 0 0 0 0 0 0 $============================ MATERIAL PROPERTIES ============================== Page A.111
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Oasys LS-DYNA Environment 8.1 VOLUME 3 ... - Oasys Software

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