2023.1

2023.1

*MAT_224 (TABULATED_JOHNSON_COOK)

LS-DYNA Input Interface KeywordThis model expresses material stress as a function of strain, strain rate, temperature dependency and plastic strain failure criterion.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)
MAT_224_{OPTION} or MAT_TABULATED_JOHNSON_COOK_{OPTION}
`mat_ID`	$ρ_{i}$	`E`	$υ$	`CP`	`Tref`	`Beta`	`Nfail`
`TAB_strs`	`TAB_temp`	`TABf_tri`	`TABf_rate`	`TABf_temp`	`TABf_size`

Definition

Field	Contents	SI Unit Example
`Option`	<BLANK> (Default) The strain rate effect in table `TAB_strs` is interpolated with linear interpolation. LOG_INTERPOLATION The strain rate effect in table `TAB_strs` is interpolated with logarithmic interpolation.
`mat_ID`	Material identifier. (Integer)
$ρ_{i}$	Initial density. (Real)	$[\frac{kg}{m^{3}}]$
`E`	Young's modulus. (Real)	$[Pa]$
$υ$	Poisson's ratio. (Real)
`CP`	Specific heat coefficient. (Real)
`Tref`	Reference temperature. (Real)	$[K]$
`Beta`	Fraction of plastic work converted in heat. (Real)
`Nfail`	> 0 Number of integration points for solid element to fail. < 0 Percentage of integration points for solid element to fail. (Real)
`TAB_strs`	Table identifier for effective stress versus plastic strain and strain rate. (Integer)	$[Pa]$
`TAB_temp`	Table identifier for effective stress scaling coefficient versus temperature. (Integer)
`TABf_tri`	Table identifier for plastic strain to failure versus triaxiality index and Lode angle. (Integer)
`TABf_rate`	Table identifier for plastic strain to failure scaling coefficient versus strain rate. (Integer)
`TABf_temp`	Table identifier for plastic strain to failure scaling coefficient versus temperature. (Integer)
`TABf_size`	Table identifier for plastic strain to failure scaling coefficient versus element size. (Integer)

Comments

This keyword maps to /MAT/LAW109 and /FAIL/TAB2.
LOG_INTERPOLATION can be added to use logarithmic interpolation for strain rate dependent tables.
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.