*MAT_003 (PLASTIC_KINEMATIC)

LS-DYNA Input Interface KeywordDefines an isotropic, elasto-plastic material with s Cowper-Symonds strain rate model.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)
*MAT_003 or *MAT_PLASTIC_KINEMATIC
mat_ID	${\rho }_i$	E	$\upsilon$	SIGY	ETAN	CHARD
SRC	SRP	EPS_F

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. (Real)
SIGY	Yield stress. (Real)	$\left[\text{Pa}\right]$
ETAN	Plastic slope. (Real)	$\left[\text{Pa}\right]$
CHARD	Hardening coefficient. (Real)
SRC	Cowper – Symond strain rate dependency coefficient. (Real)	$\left[\frac{\text{1}}{\text{s}}\right]$
SRP	Cowper – Symond strain rate dependency exponent. (Real)
EPS_F	Failure plastic strain. (Real)

Comments

1. This keyword maps to /MAT/LAW44 (COWPER).
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.