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: *CONTACT Example of: Shell Rebounds from Plate Using Five Contact Types Example Filenames: plate_type_3.key plate_type_4.key plate_type_5.key plate_type_10.key plate_type_13.key Description: A shell element drops and rebounds on an elastic plate. Model: The plate measures 40 × 40 × 1 mm 3 and contains 16 shell elements. The dropped shell element has a side length of 10 mm, a thickness of 2 mm and drop height of 10 mm. All shell elements are elastic with Belytschko-Tsay formulation. The dropped shell element has an initial velocity of 100,000 mm/second vertically towards the plate. The calculations terminate at 0.0002 seconds. Input: All nodes have an initial velocity as specified above. (*INITIAL_VELOCITY). Contact types 3, 5 and 10 use the dropped shell element as slave side and the four shell elements in the center of the plate as master side. Type 3 contact is a two way surface to surface algorithm. The segments on the slave side are checked for penetration of the master segment then the opposite search takes place. Type 4 is a single surface algorithm. The nodes of all segments are checked for penetration of all segments. Type 5 is a node to surface one way algorithm. The program checks that no slave node penetrates any master segment. Type 10 converts surface to surface definition into a node to surface definition. Type 13 is a more robust version of the single surface algorithm. It works especially well in the contact in airbag unfolding problems. Reference: Schweizerhof, K. and Weimer, K. Page A.22
Oasys LS-DYNA Environment: User Guide (Version 8.1) List of LS-DYNA input deck: CONTACT TYPE 3 *KEYWORD *TITLE SLIDING INTERFACE TYPE 3 $ $================================ 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 ] 2.000E-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 ] .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 ] 1 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 5.000E-01 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 5.000E-01 0 .000E+00 .000E+00 0 0 0 *CONTROL_HOURGLASS 4 .000E+00 $ $================================ DATABASE CARDS =============================== $ *DATABASE_MATSUM 1.000E-06 *DATABASE_NCFORC 1.000E-06 *DATABASE_RCFORC 1.000E-06 *DATABASE_BINARY_D3PLOT 1.000E-05 0 1 *DATABASE_BINARY_XTFILE *DATABASE_BINARY_D3THDT 1.000E-06 0 *DATABASE_BINARY_D3DUMP 0 *DATABASE_BINARY_RUNRSF 0 Page A.23
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Oasys LS-DYNA Environment 8.1 VOLUME 3 ... - Oasys Software

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