*MAT_121 (GENERAL_NONLINEAR_1DOF_DISCRETE_BEAM)
LS-DYNA Input Interface KeywordDefines a nonlinear elasto-plastic discrete beam material with one degree of freedom (DOF). Different loading and unloading behavior can be specified.
Format
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) |
---|---|---|---|---|---|---|---|
*MAT_121 or *MAT_GENERAL_NONLINEAR_1DOF_DISCRETE_BEAM | |||||||
mat_ID | K | H | |||||
LCL | LCU | LCD | |||||
FAILT | FAILC |
Definition
Field | Contents | SI Unit Example |
---|---|---|
mat_ID | Material identifier. (Integer) |
|
Initial density. (Real) |
||
K | Stiffness. (Real) |
|
H | Unloading option.
(Real) |
|
LCL | Curve identifier for force versus displacement
loading curve. (Integer) |
|
LCU | Curve identifier for force versus displacement
unloading curve. (Integer) |
|
LCD | Curve identifier for force versus velocity
damping curve. (Integer) |
|
FAILT | Failure elongation in
tension. (Real) |
|
FAILC | Failure elongation in
compression. (Real) |
Comments
- This keyword maps to /MAT/LAW108 (SPR_GENE) with one degree of freedom (DOF).
- DOF directions are defined by the coordinate system defined in *SECTION_BEAM. By default, the global coordinate system is used.
- This material is only used with discrete beams ELFORM=6 and CA > 0 in *SECTION_BEAM.
- Beam elements with zero initial length are recommended.
- 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.