2023.1

2023.1

*INITIAL_STRESS_SHELL_{OPTION}

LS-DYNA Input Interface KeywordDefines the reference state for elements belonging to a part, using given nodal coordinates.

Format

For Option = <BLANK>

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)
*INITIAL_STRESS_SHELL
`EID`	`npg`	`nb_integr`			`LARGE`

For Option = SET

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)
*INITIAL_STRESS_SHELL_SET
`SID`	`npg`	`nb_integr`			`LARGE`

Stress card for LARGE = 0

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)
`T`	`SIGXX`	`SIGYY`	`SIGZZ`	`SIGXY`	`SIGYZ`	`SIGZX`	`EPSP`

Stress card for LARGE = 1

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
`T`		`SIGXX`		`SIGYY`		`SIGZZ`		`SIGYZ`
`SIGZX`		`SIGZX`		`EPSP`

Definition

Field	Contents	SI Unit Example
`OPTION`	<BLANK> Define initial state for shell element. SET Define initial state for all element in the defined set of part.
`EID`	4 or 3 node shell element identifier. (Integer)
`SID`	Part set identifier. (Integer)
`npg`	Number of Gauss point in plane. = 1 Under-integrated element and 3 node shell element. = 4 Fully-integrated element. (Integer)
`nb_integr`	Integration point number through the thickness. (Integer)
`LARGE`	Format size. = 0 Regular format. = 1 Large format. (Integer)
`T`	Through thickness integration point parametric position between -1 and 1. (Real)
`SIGij`	Stress value in the direction ij. (Real)	$[Pa]$
`EPSP`	Plastic strain.

Comments

This keyword maps to /INISHE/STRS_F/GLOB or /INISH3/STRS_F/GLOB.
If npg=4, the Gauss integration points in the plane are stored in the following order: (1)
$(- \frac{\sqrt{3}}{3}, - \frac{\sqrt{3}}{3}), (+ \frac{\sqrt{3}}{3}, - \frac{\sqrt{3}}{3}), (+ \frac{\sqrt{3}}{3}, + \frac{\sqrt{3}}{3}), (- \frac{\sqrt{3}}{3}, + \frac{\sqrt{3}}{3})$
One stress card is added for each integration through the thickness and each Gauss points.