EDMP

EDMP

EDMP, Lab, MAT, VAL1, VAL2, VAL3, VAL4, VAL5, VAL6
Defines material properties for an explicit dynamics analysis.

PREP7: Explicit Dynamics

Compatible Products: – | – | – | – | – | – | DYNA

Lab

Valid material property label. Applicable labels are listed under "Material Properties" in the input table for each explicit dynamics element type in the Element Reference.

HGLS	—	Hourglass and bulk viscosity properties (valid for PLANE162, SHELL163, SOLID164 using reduced integration, and SOLID168). `VAL1` through `VAL6` are also used. For those elements using full integration, HGLS is not applicable and the input has no effect.
RIGID	—	Rigid body constraint (valid for LINK160, BEAM161, PLANE162, SHELL163, SOLID164, and SOLID168). `VAL1` and `VAL2` are also used.
CABLE	—	Cable properties (valid for LINK167). `VAL1` is optional input (see Notes).
ORTHO	—	Defines a material coordinate system for the orthotropic material model (valid for PLANE162, SHELL163, SOLID164, and SOLID168) or the anisotropic material model (valid for SOLID164 and SOLID168). `VAL1` is also used.
FLUID	—	Fluid properties (valid for PLANE162, SOLID164, and SOLID168). `VAL1` is optional input (see Notes).

MAT

Material reference number (defaults to the current MAT setting on MAT command).

VAL1, VAL2, VAL3, . . . , VAL6

Additional input for specified Lab material property. The meaning of VAL1 through VAL6 will vary, depending on Lab. See the table below for VAL1 through VAL6 definitions.

VAL1, VAL2, VAL3, . . . , VAL6 Definitions

Additional input for hourglass and bulk viscosity properties (Lab = HGLS).

VAL1

—

Hourglass control type. For solid elements (PLANE162, SOLID164, and SOLID168), 5 options are available. For quadrilateral shell and membrane elements (SHELL163) with reduced integration, the hourglass control is based on the formulation of Belytschko and Tsay; i.e., options 1-3 are identical and options 4-5 are identical.

0, 1	—	Standard LS-DYNA viscous form (default).
2	—	Flanagan-Belytschko viscous form.
3	—	Flanagan-Belytschko viscous form with exact volume integration for solid elements.
4	—	Flanagan-Belytschko stiffness form.
5	—	Flanagan-Belytschko stiffness form with exact volume integration for solid elements.

VAL2

—

Hourglass coefficient. (Defaults to 0.1.) Values greater than 0.15 may cause instabilities. The recommended default applies to all options. The stiffness forms can stiffen the response (especially if deformations are large) and, therefore, should be used with care. For the shell and membrane elements, the value input for VAL1 is the membrane hourglass coefficient. VAL5 and VAL6 can also be input, but generally VAL2 = VAL5 = VAL6 is adequate.

VAL3

—

Quadratic bulk viscosity coefficient. (Defaults to 1.5.)

VAL4

—

Linear bulk viscosity coefficient. (Defaults to 0.06.)

VAL5

—

Hourglass coefficient for shell bending. (Defaults to VAL2.)

VAL6

—

Hourglass coefficient for shell warping. (Defaults to VAL2.)

Additional input for rigid body constraint (Lab = RIGID).

VAL1

—

Translational constraint parameter (relative to global Cartesian coordinates).

0	—	No constraints (default).
1	—	Constrained X displacement.
2	—	Constrained Y displacement.
3	—	Constrained Z displacement.
4	—	Constrained X and Y displacements.
5	—	Constrained Y and Z displacements.
6	—	Constrained Z and X displacements.
7	—	Constrained X, Y, and Z displacements.

VAL2

—

Rotational constraint parameter (relative to global Cartesian coordinates).

0	—	No constraints (default).
1	—	Constrained X rotation.
2	—	Constrained Y rotation.
3	—	Constrained Z rotation.
4	—	Constrained X and Y rotations.
5	—	Constrained Y and Z rotations.
6	—	Constrained Z and X rotations.
7	—	Constrained X, Y, and Z rotations.

Additional input for cable properties (Lab = CABLE).

VAL1

—

Load curve ID defining engineering stress versus engineering strain (i.e., change in length over the initial length). If VAL1 and Young's modulus [MP,EX] are input, the load curve corresponding to VAL1 will be used and Young's modulus will be ignored.

Additional input for material coordinate system (Lab = ORTHO).

VAL1

—

Coordinate system ID number from the EDLCS command. This coordinate system will be used to orient the orthotropic or anisotropic materials associated with the material number, MAT.

Additional input for fluid material properties (Lab = FLUID).

VAL1

—

Bulk modulus of fluid. If VAL1 is not input, the bulk modulus will be calculated from the elastic modulus (EX) and Poisson's ratio (NUXY).

Notes

For Lab = RIGID, you must specify elastic modulus (EX), density (DENS), and Poisson's ratio (NUXY) [MP command]. For Lab = CABLE, you must specify density (DENS) and one of the following: Young's modulus (EX) or an engineering stress-strain curve (VAL1). For Lab = FLUID, you must specify either the bulk modulus (VAL1) or both Young's modulus (EX) and Poisson's ratio (NUXY) (if all three are specified, only VAL1 will be used).

After you define a rigid body using EDMP,RIGID, you may assign inertia properties to that rigid body using the EDIPART command.

EDMP,ORTHO is required for orthotropic or anisotropic material properties that are not locally orthotropic with material axes determined by element nodes (see Orthotropic Elastic Model and Anisotropic Elastic Model in the ANSYS LS-DYNA User's Guide).

Via the GUI, Lab = RIGID, CABLE, ORTHO, and FLUID are available through the material model interface. See Defining Explicit Dynamics Material Models in the ANSYS LS-DYNA User's Guide for more information.

Use the MPLIST and MPDELE commands to list and delete materials defined by the EDMP command.

This command is also valid in SOLUTION.

Distributed ANSYS Restriction This command is not supported in Distributed ANSYS.

Menu Paths

Main Menu>Preprocessor>Loads>Load Step Opts>Other>Change Mat Props>Hourglass Ctrls>Local

Main Menu>Preprocessor>Material Props>Hourglass Ctrls>Local

Main Menu>Solution>Analysis Options>Hourglass Ctrls>Local

Main Menu>Solution>Load Step Opts>Other>Change Mat Props>Hourglass Ctrls>Local