/INIBRI/STRS_F

Block Format Keyword Describes the initial state (full stress in local system, values for each integration point) for a brick.

Format


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/INIBRI/STRS_F/`unit_ID`

Format used for:


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`brick_ID`	`Nb_integr`	`Isolnod`	`Isolid`	`nptr`	`npts`	`nptt`	`nlay`	`grbric_ID`

For each integration point

Format for the other solid element formulation


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`brick_ID`	`Nb_integr`	`Isolnod`	`Isolid`	`nptr`	`npts`	`nptt`	`nlay`	`grbric_ID`

For each integration point


Field	Contents	SI Unit Example
`unit_ID`	Unit identifier. (Integer, maximum 10 digits)
`brick_ID`	Element identifier. (Integer)
`Nb_integr`	Number of integration points. Corresponds to the property definition of this element. (Integer)
`Isolnod`	Number of nodes of solid element. (Integer)
`Isolid`	Solid element formulation. Corresponds to the solid element formulation in property definition of this element. (Integer)
`nptr`	Number of integration points in direction r. (Integer)
`npts`	Number of integration points in direction s. (Integer)
`nptt`	Number of integration points in direction t. (Integer)
`nlay`	Number of layers for thick shell elements. (Integer)
`grbric_ID`	Brick group identifier. (Integer)
$ε_{p}$	Plastic strain. (Real)
$σ_{1}$	Stress. (Real)	$[Pa]$
$σ_{2}$	Stress. (Real)	$[Pa]$
$σ_{3}$	Stress. (Real)	$[Pa]$
$σ_{12}$	Shear stress. (Real)	$[Pa]$
$σ_{23}$	Shear stress. (Real)	$[Pa]$
$σ_{31}$	Shear stress. (Real)	$[Pa]$
`E`_int	Internal energy of solid element. (Real)	$[\frac{J}{m^{3}}]$
$ρ$	Volumetric mass. (Real)	$[\frac{kg}{m^{3}}]$

The initial state for brick may be defined by more than one block.
Only one block of stress values needs to be defined when the elements are defined with the group of bricks, grbric_ID. The value defined in the block will be applied to all elements in the group of bricks. All the elements defined in the group of bricks must belong to the same part (/PART).
Using /INIBRI/STRS_F you are assuming there is no density of the deformed elements. Before the first cycle, Radioss will check consistency of the input stress tensor with material data (stiffness and density):
$D = \frac{s_{11} + s_{22} + s_{33}}{3} - B u l k \cdot (1 - \frac{ρ}{ρ_{0}}) = 0$
Where,

$ρ_{0}$

Density defined in the Starter file.

$ρ$

Density in the state file.

If the stress is not fulfilled, Radioss will correct the diagonal entry of the stress tensor:
$σ_{i}^{i n i t i a l} = σ_{i}^{i n p u t} - D$
( $i$ =1,2,3)