*MAT_100 (SPOTWELD)

LS-DYNA Input Interface KeywordThis keyword defines an elasto-plastic spotweld material for beam element (elform=9) or solid element.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)
*MAT_100 or *MAT_SPOTWELD
mat_ID	${\rho }_i$	E	ν	SIGY	ET
EFAIL	NRR	NRS	NRT	MRR	MSS	MTT

Definition

Field	Contents	SI Unit Example
mat_ID	Material identifier (Integer)
${\rho }_i$	Initial density (Real)	$\left[\frac{\text{kg}}{{\text{m}}^{\text{3}}}\right]$
E	Young’s modulus (Real)	$\left[\text{Pa}\right]$
v	Poisson’s ratio (Real)
SIGY	Yield stress (Real)	$\left[\text{Pa}\right]$
ET	Plastic hardening modulus (Real)	$\left[\text{Pa}\right]$
EFAIL	Plastic strain to failure (Real)
NRR	Axial failure force (for beam only, only ≥ 0). EFAIL is ignored. (Real)	$\left[\text{N}\right]$
NRS	Shear failure force in local direction S (for beam only, only ≥ 0). EFAIL is ignored. (Real)	$\left[\text{N}\right]$
NRT	Shear failure force in local direction T (for beam only, only ≥ 0). EFAIL is ignored. (Real)	$\left[\text{N}\right]$
MRR	Torsional failure moment (for beam only, only ≥ 0) (Real)	$\left[\text{Nm}\right]$
MRS	Bending failure moment along local direction S (for beam only, only ≥ 0) (Real)	$\left[\text{Nm}\right]$
MRT	Bending failure moment along local direction T (for beam only, only ≥ 0) (Real)	$\left[\text{Nm}\right]$

Comments

1. This keyword maps to /PROP/TYPE43 (CONNECT), /MAT/LAW59 (CONNECT) and /FAIL/CONNECT.
2. This keyword linked to beam elements maps to /PROP/TYPE13 (SPR_BEAM).
3. The option “_TITLE” can be added to the end of this keyword. When “_TITLE” is included, an extra 80 character long line is added after the keyword input line which allows an entity title to be defined.