LS DYNA Basic Cards

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LS-DYNA Basic Training Input Deck Structure Basic Cards V1.0
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LS-DYNA Basic TrainingInput Deck Structure Basic Cards V1.0

Frequently Used Building Blocks of DYNA-deck

*NODE *ELEMENT *PART *SECTION *MATERIAL *LOAD *BOUNDARY *DEFINE

*CONTROL *DATABASE *PART_INERTIA *PART_CONTACT

KEYWORD RELATIONSHIP*ELEMENT_ SHELL EID PID N1 N2 N3 N4 *NODE NID X Y Z TC RC *PART PID SID MID *SECTION_ SHELL SID EFORM SHRF NIP PROPT QR *MAT_ ELASTIC MID RO E PR DA DB K

*NODEFORMAT: (I8,3E16.0,2E8.0) NID X Y Z TC RC NID:- Node id X,Y,Z Co-ordinates TC Translational constrains (0-7) RC Rotational Constrains (0-7)

*ELEMENTHere elemental connectivity and part ids are given. *ELEMENT_SOLID

-To define 3D solid element

*ELEMENT_SHELL-To define 3-4 noded elements (3d-shell,membrane,etc)

*ELEMENT_BEAM-To define 2 noded elements (3d-beams,truss,etc.)

*ELEMENT_DISCRETE-To define spring or dampers

*ELEMENT_MASS-To define a lumped mass on node

*ELEMENT_SEATBELT-To define a seat belt element

*SECTIONHere element formulation, integration rule, nodal thicknesses, c/s properties are defined. *SECTION_SHELL

Use default formulation for most of the cases Thickness, formulation Formulation Use formulation 1 or 2 Beam section values

*SECTION_SOLID

*SECTION_BEAM

*MaterialHere material properties are defined MAT_ELASTIC (MAT1)

Density, Modulus, Poissons ratio For parts not expected to yield

MAT_PIECEWISE_LINEAR_PLASTICITY (MAT24)

Density, Modulus, Poissons ratio Stress-strain curve or yield stress and tangent modulus For parts which may yield/fail Density, Modulus, Poissons ratio Model rigid parts

MAT_RIGID (MAT20)

*DEFINE*DEFINE_BOX-Used to define box like volume. (Box volume is then referenced in *initial_velocity, *contact, *load cards)

*DEFINE_COORDINATE_**-Used to define local co-ordinate systems. (Referenced in *load, *boundary cards)

*DEFINE_CURVE

-Used to define curves. (Referenced in *mat, *load cards) -Used to define vectors

*DEFINE_VECTOR *DEFINE_SD_ORIENTATION-Used to define orientation vectors for spring and dampers.

*LOAD

*LOAD_NODE_POINT-Used to define nodal forces on individual node

*LOAD_NODE_SET *LOAD_SEGMENT

-Used to define nodal forces on set of nodes -Used to define pressure on segment

*LOAD_SEGMENT_SET-Used to define pressure on set of segments

*LOAD_SHELL_**-Used to define pressure on one or more shell elements

*LOAD_BODY-Used to define body loads( accn and angular velocities)

*LOAD_RIGID_BODY-Used to apply nodal forces to rigid body

*BOUNDARY*BOUNDARY_PRESCRIBED_MOTION_OPT1_OPT-Used to apply imposed nodal motion (disp, velocity or accn) OPT1 can be:- NODE, SET, RIGID, RIGID_LOCAL OPT2 can be:- ID

-Used to define local co-ordinate systems. (Referenced in *load, *boundary cards) OPT1 can be:- NODE, SET OPT2 can be:- ID

*BOUNDARY_SPC_OPT1_OPT2

*CONTROL*CONTROL_ENERGY Control for energy dissipation (default) *CONTROL_HOURGLASS Hourglass control *CONTROL_OUTPUT To set output parameters *CONTROL_PARALLEL Controls parallel processing *CONTROL_SHELL Controls for computing shell response *CONTROL_TERMINATION Controls termination time *CONTROL_TIMESTEP Setting up time step *CONTROL_ACCURACY Control parameters for improvingaccuracy of the solution

*CONTROL_CONTACT

Controls contact behavior

*DATABASE*DATABASE_OPTION-To specify the output frequency of ASCII output files

*DATABASE_BINARY_OPTION-To specify the output frequency of binary output files

Other Important *Part Cards*PART_INERTIA- Allows inertia properties and initial conditions to be defined rather than calculated from FE. Important parameters: Translational mass Initial translations / Initial rotations

*PART_CONTACT - Allows part based contact option to be used with automatic contacts.Important option : OPTT optional contact thickness SFT optional contact thickness scale factor. It scales the true thickness. SSF Slave contact stiffness scale factor.