/LEAK/MAT
Block Format Keyword Specifies effective leakage area of porous airbag fabric materials LAW19 and LAW58 as function of time, pressure, area and other parameters.
Format
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
/LEAK/MAT/mat_ID/unit_ID | |||||||||
mat_title | |||||||||
Ileakage | AscaleT | AscaleP |
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
AC' | fct_IDAC' | FscaleAC' |
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
LC | AC |
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
fct_IDLC | fct_IDAC | FscaleLC | FscaleAC |
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
L | R | ||||||||
C1 | C2 | C3 |
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
X0 | X1 | X2 | X3 |
Definition
Field | Contents | SI Unit Example |
---|---|---|
mat_ID | Material
identifier. (Integer, maximum 10 digits) |
|
unit_ID | Unit identifier. (Integer, maximum 10 digits) |
|
mat_title | Material
title. (Character, maximum 100 characters) |
|
Ileakage | Effective leakage area
formulation flag.
(Integer) |
|
AscaleT | Abscissa time scale factor
on function. Default = 1 (Real) |
|
AscaleP | Abscissa pressure scale
factor on function. Default = 1 (Real) |
|
AC' | Area coefficient for area
in contact
. Default = 0 (Real) |
|
fct_IDAC' | Area coefficient function
identifier AC'(t) if AC' is equal to 0. (Integer) |
|
FscaleAC' | Scale factor on function
AC'. Default = 1 (Real) |
|
LC | Leakage
coefficient. Default function is 0 (Real) |
|
AC | Area
coefficient. Default = 0 (Real) |
|
fct_IDLC | Leakage coefficient
function identifier LC(t), if Ileakage
=2 or 3. Leakage coefficient function identifier , if Ileakage =4 Default function is 0 (Integer) |
|
FscaleLC | Scale factor on function
LC. Default = 1 (Real) |
|
fct_IDAC | Area coefficient function
identifier
, if Ileakage
=2. Area coefficient function identifier , if Ileakage =3. Area coefficient function identifier , if Ileakage =4. Default function is 0 (Integer) |
|
FscaleAC | Scale factor on function
AC. Default = 1 (Real) |
|
L | Characteristic
length. Default = 1 (Real) |
|
R | Fiber thickness. Default = L (Real) |
|
C1 | Coefficient
C1. (Real) |
|
C2 | Coefficient C2. Default = 1 (Real) |
|
C3 | Coefficient
C3. (Real) |
|
X0, X1, X2, X3 | Coefficients of
Anagonye-Wang leakage area law. (Real) |
Comments
- The mat_ID must be the same as /MAT/LAW19 (FABRI) or /MAT/LAW58 (FABR_A). Material porosity is active only when corresponding components are referred as external surfaces in /MONVOL/AIRBAG1, /MONVOL/COMMU1, and /MONVOL/FVMBAG1 airbag cards.
- Effective leakage area (
) formulation:
Ileakage =1:
Ileakage =2:
Ileakage =3:
Ileakage =4:
Where,- Initial area of the airbag surface
Note: By default all coefficients and functions are zero.Ileakage =5:
Where, and are the stretches in warp and weft directions and is the angle between warp and weft directions.Note: For LAW19Ileakage =6:
with and
- Blockage of airbag fabric, due to
contact, can be activated in corresponding /MONVOL card.
Effective leakage area is calculated with account of the blockage as: