*MAT_098 (SIMPLIFIED_JOHNSON_COOK)

LS-DYNA Input Interface KeywordDefines an isotropic elasto-plastic material using the Johnson-Cook material model.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)
*MAT_098 or *MAT_SIMPLIFIED_JOHNSON_COOK
mat_ID	${\rho }_i$	E	$\upsilon$
A	B	N	C	FAIL	SIGMAX		EPS0

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)	$\left[\text{Pa}\right]$
$\upsilon$	Poisson’s ratio. Default = 0 (Real)
A	Yield stress. (Real)	$\left[\text{Pa}\right]$
B	Hardening coefficient. (Real)	$\left[\text{Pa}\right]$
N	Hardening exponent. (Real)
C	Strain rate coefficient. (Real)
FAIL	Plastic strain to failure. (Real)
SIGMAX	Maximum stress limit. (Real)	$\left[\text{Pa}\right]$
EPS0	Reference strain rate. (Real)	$\left[\frac{\text{1}}{\text{s}}\right]$

Comments

1. This keyword maps to /MAT/LAW2.
2. 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.