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_LINEAR Example of: Linearly Constrained Plate Example Filename: plates_constrained.key Description: The center node of a plate moves in the direction normal to the plate. Two other nodes that are neighbors to the center node are constrained such that their displacement in the normal direction is identical. Model: The plate is made of an elastic material measuring 40 × 40 × 2 mm 3 and contains 64 Hughes-Liu shell elements. The center node displacement increases linearly. At the termination time, 0.0005 seconds, the displacement is 15 mm. The degree of freedom in the z-direction for the two constrained nodes is identical. Input: A load curve defines the magnitude of the prescribed displacement of the center node, 41 (*BOUNDARY_PRESCRIBED_MOTION_NODE, *DEFINE_CURVE). A linear constraint card defines the coupling of the displacement in the z-direction between the two constrained nodes, 40 & 42, (*CONSTRAINED_LINEAR). Two equal coefficients with opposite signs control the displacement. Results: The plots simply show that the two constrained nodes displace the same amount. Reference: Schweizerhof, K. and Weimer, K. Page A.12
Oasys LS-DYNA Environment: User Guide (Version 8.1) List of LS-DYNA input deck: *KEYWORD *TITLE TEST PLANAR JOINTS $ $================================ CONTROL CARDS ================================ $ *CONTROL_STRUCTURED *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 ] 2.000E-02 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 ] 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 $ $================================ DATABASE CARDS =============================== $ *DATABASE_JNTFORC 1.000E-05 *DATABASE_BINARY_D3PLOT 3.333E-05 0 1 *DATABASE_BINARY_XTFILE *DATABASE_BINARY_D3THDT .000E+00 0 *DATABASE_BINARY_D3DUMP 0 *DATABASE_BINARY_RUNRSF 0 *DATABASE_BINARY_INTFOR 3.333E-05 0 *DATABASE_EXTENT_BINARY 0 0 0 0 0 0 0 0 0 0 0 $ $============================ MATERIAL PROPERTIES ============================== Page A.13
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Oasys LS-DYNA Environment 8.1 VOLUME 3 ... - Oasys Software

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