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: *INTEGRATION_SHELL Example of: Cantilever Beam with Lobotto Integration Example File Name: beam_lobotto.key Description: A cantilever beam is loaded by a concentrated nodal load. The load is then removed and the beam vibration is critically damped. Lobotto integration rules place the quadrature points on the true surfaces on the shell. [See Hughes]. Model: The plate measures 1.00 × 0.10 × 0.01 in 3 and is modeled with 60 Belytschko-Tsay shell elements. The displacement of the nodes is fixed at one end and a concentrated load of 0.05 pounds is applied to the other end. Symmetry conditions for the plane strain case exist on the beam sides. The termination time is 0.01 seconds plus the period of the beam. Input: The concentrated loads and load curve definition 1 define the load on the end of the beam (*LOAD_NODE_POINT, *DEFINE_CURVE). The beam is critically damped (*DAMPING_GLOBAL) The number of integration points is 5 (*SECTION_SHELL). The shell integration rule is the Lobotto integration rule (*SECTION_SHELL) Results: The displacement of the beam damps out critically. The x-stress values at the integration points exhibit tension on one side, compression on the opposite side, and balance at the neutral axis. Page A.82
Oasys LS-DYNA Environment: User Guide (Version 8.1) List of LS-DYNA input deck: *KEYWORD *TITLE LOBOTTO INTEGRATION $ $================================ 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 ] 1.534E-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 ] 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 0 0 0 .000E+00 2 1000 *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_NODOUT 1.000E-04 *DATABASE_ELOUT 1.000E-04 *DATABASE_GLSTAT 1.000E-04 *DATABASE_BINARY_D3PLOT 3.068E-04 0 1 *DATABASE_BINARY_XTFILE *DATABASE_BINARY_D3THDT 1.000E-04 0 *DATABASE_BINARY_D3DUMP 0 *DATABASE_BINARY_RUNRSF 0 *DATABASE_BINARY_INTFOR 3.068E-04 0 *DATABASE_HISTORY_NODE 31 Page A.83
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Oasys LS-DYNA Environment 8.1 VOLUME 3 ... - Oasys Software

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