2023.1

2023.1

*MAT_012 (ISOTROPIC_ELASTIC_PLASTIC)

LS-DYNA Input Interface KeywordDefines an isotropic, elasto-plastic material.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)
MAT_012 or MAT_ISOTROPIC_ELASTIC_PLASTIC
`mat_ID`	$ρ_{i}$	`G`	`SIGY`	`ETAN`	`BULK`

Definition

Field	Contents	SI Unit Example
`mat_ID`	Material identifier. (Integer)
$ρ_{i}$	Initial density. (Real)	$[\frac{kg}{m^{3}}]$
`G`	Shear modulus. (Real)	$[Pa]$
`SIGY`	Yield stress. (Real)	$[Pa]$
`ETAN`	Plastic hardening modulus. (Real)	$[Pa]$
`BULK`	Bulk modulus. (Real)	$[Pa]$

Comments

This keyword maps to /MAT/LAW2 (PLAS_JOHNS).
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.