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

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Oasys LS-DYNA Environment: User Guide (Version 8.1) *END This line is optional and flags the end of the input file. *EOS This section reads the equations-of-state parameters. The equation of state identifier, EOSID, points to the equation of state identifer in the *PART card. *HOURGLASS Defines hourglass and bulk viscosity properties. The identifier, HGID, on the *HOURGLASS card refers to HGID on *PART card. *INCLUDE Keyword input can be read from several files to help manage the data. The file name given after the *INCLUDE card is opened and data is then read from that file. If a *END card is found or the end of the file is reached, the file is closed and the program continues to read from the original file. Several *INCLUDE statements may be in the same file or they may be nested through a number of files. *INITIAL Initial velocity and initial momentum for the structure can be specified in this section. The initial velocity specification can be made by *INITIAL_VELOCITY_NODE card or *INITIAL_VELOCITY cards. In the case of *INITIAL_VELOCITY_NODE the velocity components are specified for individual nodes. Since all the nodes in the system are initialised to zero, only the nodes with non-zero velocities need to be specified. The *INITIAL_VELOCITY card provides the capability to specify velocities using sets or boxes. *INTEGRATION In this section the user defined integration rules for beam and shell elements are specified. IRID refers to integration rule number IRID on *SECTION_BEAM and *SECTION_SHELL cards respectively. Quadrature rules in the *SECTION_SHELL and *SECTION_BEAM cards need to be specified as a negative number. The absolute value of the negative number refers to user defined integration rule number. Positive rule numbers refer to the built in quadrature rules within LS-DYNA. *INTERFACE Interface definitions are used to define surfaces, nodal lines, and nodal points for which the displacement and velocity time histories are saved at some user specified frequency. This data may then be used in subsequent analyses as an interface ID in the *INTERFACE_LINKING_DISCRETE_NODE as master nodes, in *INTERFACE_ Page 4.6
Oasys LS-DYNA Environment: User Guide (Version 8.1) LINKING_SEGMENT as master segments and in *INTERFACE_LINKING_EDGE as the master edge for a series of nodes. This capability is especially useful for studying the detailed response of a small member in a large structure. For the first analysis, the member of interest need only be discretised sufficiently that the displacements and velocities on its boundaries are reasonably accurate. After the first analysis is completed, the member can be finely discretised in the region bounded by the interfaces. Finally, the second analysis is performed to obtain highly detailed information in the local region of interest. When beginning the first analysis, specify a name for the interface segment file using the Z=parameter on the LS-DYNA execution line. When starting the second analysis, the name of the interface segment file created in the first run should be specified using the L=parameter on the LS-DYNA command line. Following the above procedure, multiple levels of sub-modelling are easily accommodated. The interface file may contain a multitude of interface definitions so that a single run of a full model can provide enough interface data for many component analyses. The interface feature represents a powerful extension of LS-DYNA's analysis capability. *KEYWORD Flags LS-DYNA that the input deck is a keyword deck. To have an effect this must be the very first card in the input deck. Alternatively, by typing "keyword" on the execute line, keyword input formats are assumed and the *KEYWORD is not required. This keyword can also be used to specify the amount of memory, in words, that the analysis is to use by adding the required amount to the input line ,e.g *KEYWORD 5000000. *LOAD This section provides various methods of loading the structure with concentrated point loads, distributed pressures, body force loads, and variety of thermal loadings. *MAT This section allows the definition of constitutive constants for all material models available in LS-DYNA including springs, dampers, and seat belts. The material identifier, MID, points to the MID on the *PART card. *NODE Define nodal point identifiers and their coordinates. *PART This keyword serves two purposes. 1. Relates part ID to *SECTION, *MAT, *EOS and *HOURGLASS sections. 2. Optionally, in the case of a rigid material, rigid body inertia properties and initial conditions can be specified. Deformable material repositioning data can also be specified in this section if the reposition option is invoked on the *PART card, i.e., *PART_REPOSITION. Page 4.7
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Oasys LS-DYNA Environment 8.1 VOLUME 3 ... - Oasys Software

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