/INISHE/STRS_F or /INISH3/STRS_F

Block Format Keyword Describes the initial state of stress.

Format

(1)	(2)	(3)	(4)	(5)	(7)	(9)
/INISHE/STRS_F/`unit_ID` or /INISH3/STRS_F/`unit_ID`
`shell_ID`	`nb_integr`	`npg`	`Thick`
$E_{m}$		$E_{b}$		`H`₁	`H`₂	`H`₃

if nb_integr = 0

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
$σ_{1}$		$σ_{2}$		$σ_{12}$		$σ_{23}$		$σ_{31}$
$ε_{p}$		$σ_{b 1}$		$σ_{b 2}$		$σ_{b 12}$

if nb_integr > 0

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
$σ_{1}$		$σ_{2}$		$σ_{12}$
$σ_{23}$		$σ_{31}$		$ε_{p}$

Field	Contents	SI Unit Example
`unit_ID`	Unit Identifier. (Integer, maximum 10 digits)
`shell_ID`	Element identifier. (Integer)
`nb_integr`	Integration point number through the thickness. (Integer)
`npg`	Number of surface quadrature points. = 0 Default set to 1 = 1 Must be used for shell formulations `I`_shell =1, 2, 3, or 4; or `I`_sh3n =1, 2, or 31 = 3 Must be used for DKT18 shell formulation (`I`_sh3n =30) = 4 Must be used for BATOZ or QEPH formulation (`I`_shell =12, 24) (Integer)
`Thick`	Shell thickness. 8 (Real)	$[m]$
$E_{m}$	Total membrane energy. (Real)	$[J]$
$E_{b}$	Total bending energy. (Real)	$[J]$
`H`₁	Hourglass force. 3 (Real)	$[N]$
`H`₂	Hourglass force. 3 (Real)	$[N]$
`H`₃	Hourglass force. 3 (Real)	$[N]$
$σ_{1}$	First plane stress. (Real)	$[Pa]$
$σ_{2}$	Second plane stress. (Real)	$[Pa]$
$σ_{12}$	Shear stress. (Real)	$[Pa]$
$σ_{23}$	Shear stress. (Real)	$[Pa]$
$σ_{31}$	Shear stress. (Real)	$[Pa]$
$ε_{p}$	Plastic strain. (Real)
$σ_{b 1}$	Bending stress. (Real)	$[Pa]$
$σ_{b 2}$	Bending stress. (Real)	$[Pa]$
$σ_{b 12}$	Bending stress. (Real)	$[Pa]$

The nb_integr should be equal to the nb_integr defined in the shell property definition.
The npg must be set according to the formulation which is used in the shell property
The H₁, H₂ and H₃ are read only when npg = 0 or npg = 1
The bending stresses are:(1)
$\frac{M}{l \cdot e^{2}}$

Where,

$l$

Length

$e$

Thickness

$M$

Moment
For npg = 0 or 1 and nb_integr > 0, the optional continuation lines have to be repeated for each integration point.
For npg = 3 or 4, the optional continuation lines must be repeated npg times for each integration point as:
repeat for each integration point
- Line 7
- Line 8
The initial state for shell may be defined by more than one block.
The value given for thickness (Thick) will be used instead of the thickness given in property or in the shell definition.