*MAT_020 (RIGID)

LS-DYNA Input Interface KeywordDefines a rigid material assigned to a part.

Format

(1) (2) (3) (4) (5) (6) (7) (8)
*MAT_020 or *MAT_RIGID
mat_ID ρ i E υ
CMO CON1 CON2
LCO

Definition

Field Contents SI Unit Example
mat_ID Material identifier.

(Integer)
ρ i Initial density.

(Real)

 [ kg m 3 ]
E Young’s modulus.

(Real)

 [ Pa ]
υ Poisson’s ratio.

Default = 0 (Real)
CMO Rigid body boundary conditions option.
= 0.0 (Default)
No boundary conditions.
= 1.0
Boundary conditions are applied in a global coordinate system.
= -1.0
Boundary conditions are applied in a local coordinate system.

(Real)
CON1 If CMO = 1, Global system translation boundary condition.
= 0
Free.
= 1
x translation is fixed.
= 2
y translation is fixed.
= 3
z translation is fixed.
= 4
x and y translation are fixed.
= 5
y and z translation are fixed.
= 6
x and z translation are fixed.
= 7
x, y, and z translation are fixed.
If CMO=-1
Local boundary condition system identifier.

(Integer)
CON2 If CMO = 1, Global system rotation boundary condition.
= 0
Free.
= 1
x rotation is fixed.
= 2
y rotation is fixed.
= 3
z rotation is fixed.
= 4
x and y rotation are fixed.
= 5
y and z rotation are fixed.
= 6
x and z rotation are fixed.
= 7
x, y, and z rotation are fixed.
If CMO=-1
Local boundary condition system identifier.
If CMO = -1. Local system boundary conditions. Enter 6 values for translation and rotation where,
= 0
Free DOF
= 1
Fixed DOF

(6 Booleans)

Example: 101111 means the x and z translations, and all rotations are fixed. The y translation is free.
LCO Local coordinate system identifier used for time history output for CMO = -1.

Comments

  1. This keyword maps to /MAT/LAW1 (ELAST). All the nodes of the part are defined in a rigid body (/RBODY) with a boundary condition applied to the rigid body’s independent node defined in a global or local coordinate system.
  2. The option “_TITLE” can be added to the end of this keyword. When “_TITLE” is included, an extra 80 characters long line is added after the keyword input line which allows an entity title to be defined.