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

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Oasys LS-DYNA Environment: User Guide (Version 8.1) Rigid Bodies Defining body Contacts and Rigidwalls Boundary Conditions & Loadings Constraints and spot welds Extra nodes Merged bodies Nodal rigid bodies Defaults for contacts Definition of contacts Definition of rigidwalls Restraints Gravity (body) load Point load Pressure load Thermal load Load curves Constrained nodes Welds Rivet Output Control Defaults ASCII time history files Binary plot, time history and restart files Items in time history blocks Nodes for nodal reaction output Termination Termination time Termination cycle CPU termination Degree of freedom *PART *MAT_RIGID *PART_INERTIA *CONSTRAINED_EXTRA_NODES_Option *CONSTRAINED_RIGID_BODIES *CONSTRAINED_NODAL_RIGID_BODY_Option *CONTROL_CONTACT *CONTACT_Option *RIGIDWALL_Option *NODE *BOUNDARY_SPC_Option *LOAD_BODY_Option *LOAD_NODE_Option *LOAD_SEGMENT_Option *LOAD_SHELL_Option *LOAD_THERMAL_Option *DEFINE_CURVE *CONSTRAINED_NODE_SET *CONSTRAINED_GENERALIZED_ WELD_Option *CONSTRAINED_SPOT_WELD *CONSTRAINED_RIVET *CONTROL_OUTPUT *DATABASE_Option *DATABASE_BINARY_Option *DATABASE_HISTORY_Option *DATABASE_NODAL_FORCE_GROUP *CONTROL_TERMINATION *CONTROL_TERMINATION *CONTROL_CPU or via Oasys_71 shell *TERMINATION_NODE Page 4.10
Oasys LS-DYNA Environment: User Guide (Version 8.1) 5.0 UNITS There is no way of telling LS-DYNA what units the model uses so units must be compatible. One way of testing whether a set of units is compatible is to check that: 1 (force unit) = 1 (mass unit) x 1 (acceleration unit) and that 1 (acceleration unit) = 1 (length unit) [1 (time unit)]² Examples of sets of compatible units are: (a) (b) © Length unit metre millimetre millimetre Time unit second second millisecond Mass unit kilogramme tonne kilogramme Force unit Newton Newton kiloNewton Young's Modulus of Steel 210E9 210E3 210 Density of Steel 7.85E3 7.85E-9 7.85E-6 Yield stress of Mild Steel 200E6 200 0.200 Acceleration due to gravity 9.81 9.81E3 9.81E-3 Velocity equivalent to 30mph 13.4 13.4E3 13.4 Page 5.1
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Oasys LS-DYNA Environment 8.1 VOLUME 3 ... - Oasys Software

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