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laws:irsth
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IRSTH
Description
Elastic-visco-plastic constitutive law with thermal effects for solid elements at variable temperature (to check before use, A-M. HABRAKEN, june 91).
The model
Coupled thermo-mechanical analysis of elastic-visco-plastic solids undergoing large strains
Files
Prepro: LIRSTH.F
Lagamine: IRSC2E.F, IRSC2A.F, IRSC2G.F
Availability
| Plane stress state | NO |
| Plane strain state | YES |
| Axisymmetric state | YES |
| 3D state | NO |
| Generalized plane state | YES |
Input file
Parameters defining the type of constitutive law
| Line 1 (2I5, 60A1) | |
|---|---|
| IL | Law number |
| ITYPE | 240 |
| COMMENT | Any comment (up to 60 characters) that will be reproduced on the output listing. |
Integer parameters
| Line 1 (3I5) | |
|---|---|
| NTEMP | number of temperature at which material data are given |
| NINTV | number of sub-steps used to integrate numerically the constitutive equation in a time step |
| IENTH | 0 to use the classical formulation of the heat problem 1 to use the enthalpy formulation of the heat problem |
Real parameters
2 lines repeated NTEMP times
| Line 1 (7G10.0) | |
|---|---|
| T | temperature |
| E | YOUNG's elastic modulus at temperature T |
| ANU | POISSON's ratio at temperature T |
| ALPHA | thermal expansion coefficient ($\alpha$) at temperature T |
| AN | strain rate exponent (n) at temperature T |
| B | strain rate coefficient (B) at temperature T |
| AM | hardening exponent (m) at temperature T |
| Line 2 (10X, 4G10.0) | |
| H1 | hardening coefficient ($H_1$) at temperature T |
| AQ | recovery exponent (q) at temperature T |
| H2 | recovery coefficient ($H_2$) at temperature T |
| AKO | initial yield limit ($K_o$) at temperature T |
Stresses
Number of stresses
6 for the 3D state
4 for the other cases
Meaning
The stresses are the components of CAUCHY stress tensor in global (X,Y,Z) coordinates.
For the 3-D state:
| SIG(1) | $\sigma_{XX}$ |
| SIG(2) | $\sigma_{YY}$ |
| SIG(3) | $\sigma_{ZZ}$ |
| SIG(4) | $\sigma_{XY}$ |
| SIG(5) | $\sigma_{XZ}$ |
| SIG(6) | $\sigma_{YZ}$ |
For the other cases:
| SIG(1) | $\sigma_{XX}$ |
| SIG(2) | $\sigma_{YY}$ |
| SIG(3) | $\sigma_{XY}$ |
| SIG(4) | $\sigma_{ZZ}$ |
State variables
Number of state variables
4
List of state variables
| Q(1) | = element thickness (t) in plane stress state = 1 in plane strain state = circumferential strain rate $\dot{\varepsilon_\theta}$ in axisymmetric state = 0 in 3D state |
| Q(2) | current yield limit in tension, its initial value is $K_o$ |
| Q(3) | hydrostatic stress ($\sigma_m$) |
| Q(4) | difference between the current temperature and the initial temperature |
laws/irsth.txt · Last modified: 2020/08/25 15:46 (external edit)
