*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 ρ i            
For each degree of freedom defined 1- 6, enter the following 2 cards.
(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)

ρ i Initial density.

(Real)

[ kg m 3 ]
DOF Degree of freedom. 1 through 6.

(Integer)

 
TYPE Material type.
0
Elastic.
1
Elasto-plastic.

(Integer)

 
K Stiffness.

(Real)

[ N m ]
D Viscous damping coefficient.

(Real)

[ N • s m ]
FC Failure elongation in compression input as a positive value.

(Real)

[ m ]
FT Failure elongation in tension input as a positive value.

(Real)

[ m ]
LCF
If TYPE=0
Force versus displacement curve identifier.
If TYPE=1
Force versus plastic displacement curve identifier.

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)

[ m s ] MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaamWaaeaada Wcaaqaaiaab2gaaeaacaqGZbaaaaGaay5waiaaw2faaaaa@39DE@

Comments

  1. This keyword maps to /MAT/LAW108 (SPR_GENE) with an equivalent number of degrees of freedom (DOF).
  2. DOF directions are defined by the coordinate system defined in *SECTION_BEAM. By default, the global coordinate system is used.
  3. This material is only used with discrete beams ELFORM=6 and CA > 0 in *SECTION_BEAM.
  4. Beam elements with zero initial length are recommended.
  5. 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.