# *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)

$\left[\text{Pa}\right]$
EPSP Plastic strain.

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