LS-DYNA Input Interface KeywordThis keyword defines a linear elastic discrete beam material with 6 decoupled degrees of freedom and an optional preload option.


(1) (2) (3) (4) (5) (6) (7) (8)
mat_ID ρ i TK_r TK_s TK_t RK_r RK_s RK_t
TD_r TD_s TD_t RD_r RD_s RD_t    
FO_r FO_s FO_t MO_r MO_s MO_t    


Field Contents SI Unit Example
mat_ID Material identifier.


ρ i Initial density.


[ kg m 3 ]
TK_r, TK_s, TK_t Stiffness in directions r, s, t.


[ N m ]
RK_r, RK_s, RK_t Rotational stiffness for axis r, s, t.


[ Nm rad ]
TD_r, TD_s, TD_t Damping in directions r, s, t.


[ N • s m ]
RD_r, RD_s, RD_t Rotational damping in directions r, s, t.


[ Nms rad ]
FO_r, FO_s, FO_t Force preload in directions r, s, t.


[ N ]
MO_r, MO_s, MO_t Moment preload in directions r, s, t.


[ N m ] MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaamWaaeaaci GGobGaeyyXICTaciyBaaGaay5waiaaw2faaaaa@3BFA@


  1. This keyword maps to /MAT/LAW108 (SPR_GENE).
  2. The material is only used with *SECTION_BEAM, ELFORM = 6 discrete beam elements.
  3. Beams with zero initial length are recommended.
  4. 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.