*MAT_196 (GENERAL_SPRING_DISCRETE_BEAM)
LS-DYNA Input Interface KeywordDefines a nonlinear elasto-plastic discrete beam material with 6 degrees of freedom.
Format
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) |
---|---|---|---|---|---|---|---|
*MAT_196 or *MAT_GENERAL_SPRING_DISCRETE_BEAM | |||||||
mat_ID |
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) |
---|---|---|---|---|---|---|---|
DOF | TYPE | K | D | FC | FT | ||
LCF | LCD | C1 | C2 | V0 |
Definition
Field | Contents | SI Unit Example |
---|---|---|
mat_ID | Material identifier. (Integer) |
|
Initial density. (Real) |
||
DOF | Degree of freedom. 1 through
6. (Integer) |
|
TYPE | Material type.
(Integer) |
|
K | Stiffness. (Real) |
|
D | Viscous damping
coefficient. (Real) |
|
FC | Failure elongation in compression input as a
positive value. (Real) |
|
FT | Failure elongation in tension input as a
positive value. (Real) |
|
LCF |
This input is required. (Integer) |
|
LCD | Optional damping force versus velocity curve
identifier. (Integer) |
|
C1, C2 | Nonlinear damping
coefficients. (Real) |
|
V0 | Reference velocity for nonlinear
damping. (Real) |
Comments
- This keyword maps to /MAT/LAW108 (SPR_GENE) with an equivalent number of degrees 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.